Scanning electron microscopic observations of antennal sensilla, and the cloning and expression of the BiOr816 gene of Bombus ignites from China

Scanning electron microscopic observations of antennal sensilla, and the cloning and expression of the BiOr816 gene of Bombus ignites from China | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research article Scanning electron microscopic observations of antennal sensilla, and the cloning and expression of the BiOr816 gene of Bombus ignites from China Dandan Wang, Xing Wang, Xiao-Hong Li This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-41451/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Odorant receptors play a crucial role in the special recognition of scent molecules in the bumblebee olfactory system. In this study, four types of sensilla were observed on the antennae of worker bees through a scanning electron microscope (SEM), which were mainly distributed with sensillum placodeum sensillum coeloconicum, sensillum trichodeum and sensillum cavity. The odorant receptor 816 gene ( BiOr816 ) from Bombus ignites was cloned, and its expression profiles were examined during different developmental stages and tissues. The phylogenetic tree was divided into four branches: Messor orientalis ; Apis cerana ceran , Apis mellifera and Apis dorsat ; Bombus lantschouensis , Bombus terrestris and Bombus ignites ; and Drosophila melanogaster . The cDNA sequence of BiOr816 was found to be highly similar to BtOr22c (98.2%), which encoded a membrane-coupled protein of 385 amino acids. The BiOr816 protein belongs to the 7-transmembrane_6 receptor superfamily. Accordingly, the results of the quantitative real-time PCR (qRT-PCR) indicated that BiOr816 was expressed at high levels in worker bee antennae compared to its head, thorax, abdomen, legs and wings. This demonstrated that the antenna played a vital role in the process of olfactory recognition in bumblebees and served as its most important olfactory organ, which was consistent with the corresponding electron microscope photos showing many sensilla on the antennae. Population Genetics Molecular Genetics Medical Genetics Bombus ignites worker bees scanning electron odorant receptor gene qRT-PCR bioinformatics analysis Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Introduction Bombus ignites Smith belongs to the genus Bombus in the Apidae family and is an important native powdering-insect in China, distributed within Heilongjiang, Liaoning, Gansu, Hebei, Yunnan, and other provinces. It is vital in maintaining biodiversity and ecosystem balance (Zhang et al. 2016 ; Xue et al. 2007). Bumblebees have very long mouthparts and have the ability to make contact with stigmas via high-frequencies when visiting flowers. They have demonstrated great resilience in low temperatures, reduced light conditions and highly humid environments; their abilities in adapting to various environmental conditions are significantly higher than that of honeybees (Fiach and Javier 2019 ; Wang et al. 2017 ). Unlike honeybees, bumblebees are able to resist harsh environments and undertake extended daily working times as well as single flower visit times, enabling them to better concentrate on pollinating greenhouse crops (David and Caroline 2015 ). Above all, bumblebees increase the percentage of fertile fruit and yield, improving the quality of fruits and seeds. Moreover, they can avoid hormone pollution caused by plant growth regulators in flowers. Chemical receptors are critical for bumblebees to communicate with their external environments and with other individuals, which assists bumblebees in detecting chemical signals in the surrounding environment. Olfactory sensation can mediate the corresponding organs to recognize a plethora of scents in order to search for food and mates, identify companions and enemies, and avoid dangers in the external environment (Pask et al. 2015 ; Janaina et al. 2019 ;Wang and Yang 2017 ). Taste sensation identifies soluble hormones, stimulating their innate mating behaviors (Zhang and Dong 2011 ). The important proteins that participate in chemical signal reorganization include various kinds of differently sized gene-families, of which the chemoreceptor super-families hold particular importance. They are primarily made up of odorant receptors, gustatory receptors and ionotropic receptors (Silbering et al. 2011 ; Xue et al. 2009 ), where odorant receptors serve as critical components. Odorant receptors of insects include common odor receptors (ORs) and odor co-receptors (Orco). ORs are highly differentiated in different insects (Hu et al. 2013 ), while the Orco of insects are comprised of just one type and are highly conserved (Ma et al. 2014 ). Thus far, few reports exist regarding the study of odor receptor genes in Bombus ignites . According to past studies, insect odor receptor genes are generally believed to be G-protein-coupled receptors. This study speculates that odor receptors in Bombus ignites may have similar biological effects; in addition, this study attempts to confirm that antennae are the main olfactory receptive organs of Bombus ignites in regard to electron microscopy of antennae and odor receptor gene expression. Furthermore, the evaluation of antennae olfactory function was completed according to the receptors distributed on the antennae. Consequently, BiOr816 was observed to play a crucial role in the olfactory recognition process of Bombus ignites , providing the foundation for further studies pertaining to odorant receptor gene function and mechanisms associated with olfactory recognition for Bombus ignites . Materials And Methods Bumblebee materials The Bombus ignites specimens used in this study were bred at the bee research institute of Eastern Liaoning university (40.13°N, 124.37°E). Each hive had a mature egg-laying queen and five frames, a feeding temperature of 28℃±0.5℃, humidity of 50%±5% and were kept without light. This investigation analyzed disease-free worker bees, where worker bees were immediately stored in liquid nitrogen for subsequent cloning for the target gene. Next, worker bees that immediately came out of the hive after eclosion were marked as 1-day-old with non-toxic and tasteless paint and were then marked every five days from sexually immaturity to maturity, putting them back after marking. Samples were selected on the 1st, 5th, 10th, 15th, 20th, 25th and 30th day, respectively. Afterward, the insects were used for the BiOr816 gene expression analysis (Villar et al. 2015 ). In each group, 30 worker bees were randomly collected each time, with three biological replicates from different colonies being examined, where one replicate contained five bumblebees. The experiments were conducted in the genetic engineering laboratory of eastern Liaoning University during the spring of 2018, when nectar and pollen were abundant in the natural environment. Electron microscopic scanning of antennal receptors The antennae of the Bombus ignites specimens were soaked in 2.5% glutaraldehyde for 24 hours, which were then cleaned using ultrasonic waves and put it into potassium iodide, an electrically conductive liquid. Next, dewatering and drying were carried out using tertiary butyl alcohol after washing the antennae with distilled water (Chen et al. 2013 ). The samples were then photographed, and the antennae sensilla were scanned using a Hitachi S-4800 electron microscope. Total RNA extraction The antennae, head, thorax, abdomen, legs and wings of the Bombus ignites specimens were dissected with ophthalmic forceps and crushed with a mortar and pestle. The tissue homogenates were placed into Eppendorf tubes filled with liquid nitrogen (Zhang et al. 2013 ), where the powder was then put into another Eppendorf tube with 1.5 ml RNA-free Trizol (4℃). The total RNA was extracted using a Takara insect total RNA isolation kit, and the RNA integrity was detected. The cDNA was synthesized from the total RNA isolated from antennae using the Primer-Script RT reagent kit (Takaka, www.takara-bio.com ) according to the manufacturer’s instructions (Zhao et al. 2015 ; Liu et al. 2015 ). The first cDNA strand was synthesized with total RNA as its template and Oligo-dT as its primers, which were stored in a freezer at -80℃ until use. All of the above utilized medicine was purchased from Sangon Biotech (Sangon Biotech Shanghai, China Co., Ltd). EST-SSR primers development and screening All of the available Bombus ignites EST sequences up to March 26, 2018 were downloaded from the GenBank/NCBI EST database (National Center for Biotechnology Information, http://www.ncbi.nlm.nih.gov ). To develop the EST-SSR primers, the following steps were performed. Using Perl software ( www.perl.org ), all 5068 bumblebee EST sequences were assembled in FASTA format. The Blastclust software ( www.Ncbi.nlm.nih.gov ) was then used to search for redundant sequences in all EST sequences. Then, using the CD-HIT software ( http://weizhongli-lab.org/cd-hit/ ), the short ( 700 bp) were removed, along with the 5’-hat and 3’-poly tail (A or T) of mRNA using the EST-TRIMMER software. The MISA.PL software was used to search, identify and locate SSR sites, and primer 3.0 was used to develop the EST-SSR primers. The designed parameters for the EST-SSR primers were as follows: length of 20–26 bp, annealing temperature (Tm) of 55–65 °C, content of G + C of 30–70%, and length of PCR amplification product larger than 150 bp. Finally, BLAST was used to test the developed primers. The primers were synthesized by Sangon Biotech (Sangon Biotech Shanghai, China Co., Ltd) (Table 1). The developed EST-SSR primers were used to PCR amplify the DNA samples of the bumblebees. The amplified fragments were separated and analyzed using 6% polyacrylamide gel electrophoresis for 1.5 h (constant power 55 W, DNA marker GsDL0501 from 50 bp to 500 bp). The primers were tested and screened three times; of the screened primers, those that were amplified as stable, polymorphic and clear bands were chosen to be in the final study. Cloning of BiOr816 Since odorant receptors are distributed mainly in the antennae, and their expression patterns are especially enriched in bumblebee antennae, the antennae were used for cloning (Brockmann et al. 2001). The primers used to amplify BiOr816 (Table 2 ) were designed using the primer premier 5.0 software (Premier Biosoft International Co., Palo, CA) using the input mRNA sequence of the odorant receptor gene BtOr22c (Accession number: XM_012312228.1), which was already reported in GenBank. The PCR thermocycling conditions were: 94℃ for 3 min, followed by 30 cycles at 94℃ for 30 s, 59℃ for 45 s, 72℃ for 3 min, and a final extension at 72℃ for 10 min. PCR reactions: 2.5 µL 10 × reaction buffer, 1.5 µL 2.5 mmol·L − 1 of each dNTPs, 0.5µL 200U mL − 1 Taq DNA polymerase, 1 µL 10 µmol·L − 1 each of forward and reverse primers, 50–100 ng tissue homogenate, and 1.5 µL 1.5 mmol L − 1 MgCl 2 . Double-distilled water was then added to achieve a total of 20 µL reaction volume. The PCR products were then resolved using electrophoresis on a 1% agarose gel and purified using a Gel Extraction Kit (Cwbiotech, www.cwbiotech.bioon.com.cn ). Next, the purified products were ligated into a pEASY-T3 Clone Vector and were subsequently transformed into a Trans 5α Chemically Competent Cell (TransGen Biotech) (Zhang et al. 2012 ). Positive clones were screened and sequenced by Sangon Biotech. Sequence analysis After sequencing, the cDNA sequence of BiOr816 was obtained by assembling the forward and reverse sequencing reads using the SeqMan program in the DNAstar 5.0 software (Lynnon Biosoft, Quebec, Canada). The online software ORF Finder ( http://www.ncbi.nlm.gov/gorf/gorf.html ) was used to search for the open reading frame (ORF) of the sequence. The amino acid sequence was then translated using the DNAMAN software. Similarity searches were conducted using the BlastP program on the NCBI website ( http://blast.Ncbi.nlm.nih.gov/Blast.cgi ). The isoelectric point (pI) and molecular weights (MW) were computed using Compute pI/MW ( http://www.expasy.ch/tools/pi_tool.html ). The transmembrane helix (TMH) was predicted using the TMHMM Server v.2.0 ( http://www.cbs.dtu.dk/services/TMHMM ). Alignments of multiple sequences were carried out using the ClustalX progam (Thompson, Higgins, & Gibson, 1994 ). The phylogenetic tree was constructed using MEGA 7.0 ( http://www.megasoftware.net/index.php ) with the neighbor-joining method. A portion of sequences for known Ors of bumblebees were acquired from GenBank. Expression of BiOr816 Total RNA was isolated from the antennae, heads, thoraces, abdomens, and legs of adult worker bees to determine the expression of BiOr816 . The quantitative Real-Time PCR (qRT-PCR, ABI 7500 instrument) was performed using the SYBR Premix Ex Taq kit (Takara) in a total reaction volume of 20 µL. The reaction mixture was prepared adhering to the following parameters: SYBR Premix Ex Taq Ⅱ(2×)10 µL, 0.8 µL 10 µmol·L-1 each of forward and reverse primers, 0.5 µL ROX Reference Dye (50×), and 50–100 ng cDNA, followed by the addition of double-distilled water to reach a total of 20 µl reaction volume. The primers (Table 2 ) for qRT-PCR were designed using the primer premier 5.0 software, and the actin gene was used as the internal control. qRT-PCR was performed with an initial denaturation step of 10 min at 95℃, followed by 40 cycles at 94℃ for 30 s, and 72℃ for 40 s. A melting curve analysis was conducted to verify the specificity of amplification. The relative expression patterns of BiOr816 mRNA were calculated using the 2—△△Ct comparative CT method (Schmittgen and Livak 2008 ). In order to ensure the accuracy and stability of the qRT-PCR results, under the same conditions, three parallel experiments should be done as biological replicates, with one replicate containing 10 bumblebees. Statistical analysis Differences in the relative expressions of the BiOr816 gene were determined using a t -test analysis in SPASS 17.0 (IBM, Armonk, NY). P ༜0.05 was considered to be statistically significant in all treatments. Results Scanning electron microscope photographs of the antennal receptors of Bombus ignites Four types of sensilla were observed on the antennae of worker bees through a scanning electron microscope (SEM), which are regarded as the main olfactory organ of bumblebees and were mainly distributed with sensillum placodeum and sensillum coeloconicum, though sensillum trichodeum and sensillum cavity were still present (Fig. 1 ). Sensillum placodeum has a disk-like shape, and many differently sized protrusions exist on its surface, which are closely distributed on the flagellum of the antennae. Around the sensillum placodeum, many sensillum coeloconicum were observed having short-nail-like features born in a mortar-like socket. The top of the sensillum trichodeum was slightly curved, and its base extended out from the sheath-like shape of the antennae surface, growing to the top. The sensillum cavity was sparsely distributed over the antennae, which depressed inward from the antennae surface. Here, many irregularly saw-tooth structures were present in the middle of the depressions. Cloning and sequence analysis of BiOr816 To explore the molecular functions of Bombus ignites odorant receptor 816 ( BiOr816 ), the cDNA sequence of BiOr816 containing the complete coding region was cloned. Its amino acids were predicted using the DNAMAN program, and the BiOr816 cDNA was found to possess a 5’-terminal untranslated region (UTR) of 39 bp, a 3’-terminal UTR of 67 bp, and an open reading frame (ORF) of 1158 bp encoding a polypeptide of 385 amino acids (Fig. 2 ). Through the ProtParam program ( http://www.expasy.org/tools/protparam.html ) the molecular mass of the deduced BiOr816 protein was predicted to be 48.17 kDa, its molecular formula was C 3592 H 6021 N 1165 O 1502 S 235 , and the isoelectric point (pI) was calculated to be 5.06, which was acidic and uncharged. The hydrophilic coefficient of the BiOr816 protein was 0.769, and its instability index was computed to be 50.31, indicating that the protein was unstable and hydrophobic. Moreover, the BiOr816 protein belongs to the 7-transmembrane_6 receptors superfamily, which consists of 7 trans-membrane domains: TM-Ⅰ(28–54), TM-Ⅱ(95–116), TM-Ⅲ(126–148), TM-Ⅳ(187–206), TM-Ⅴ(245–265), and TM-Ⅵ(301–320). Furthermore, the amino terminus of the protein was located in the membranes, with three phosphorylation sites (Fig. 2 and Fig. 3 ). Amino acid sequence alignment and phylogenetic analysis To determine the evolutionary relationship of BiOr816 with Bombus ignites and other species, a blast protein alignment and neighbor-joining tree were constructed for further identifying the relationships between the BiOr816 and other related protein sequences from 11plants already obtained (Fig. 4 and Fig. 5 ). Comparison of the deduced amino acid sequence of BiOr816 to that of BtOr22c (XM_012312228.1) revealed a high degree of identity of 98.2%. Similarly, alignments with the Ors of other insects exhibited high homology with BtOr9a (NC_015772.1, identity 95.1%) and BtOr13a (XM_0123091122, identity 92.6%). Using the deduced amino acid sequence of BiOr816 , a phylogenetic tree was constructed using the MEGA 7.0 software. The corresponding phylogenetic analysis demonstrated that BiOr816 and BtOr22c belong to a single genus and is embodied by a high degree of identity. Alignments with the Ors of other insects homologous with BiOr816 are Formica , Apis and Bombus ; the homology of its amino acid is between 35% and 96%. The phylogenetic tree was divided into four branches, with the first branch belonging to Messor orientalis , the second to Apis cerana ceran , Apis mellifera and Apis dorsat , the third to Bombus lantschouensis , Bombus terrestris and Bombus ignites , and the fourth to Drosophila melanogaster . Accordingly, the Bombus ignites BiOr816 sequence was found to be closely related to the Bombus terrestris odorant receptor BtOr22c sequence and possesses a high level of homology, indicating that the BiOr816 sequence cloned in this study is the Bombus ignites odorant receptor gene and the BiOr816 protein had similar structure and likely shared some gene functions. Analysis of BiOr816 expression via qRT-PCR The expression profiles of BiOr816 were characterized across different developmental stages and tissues of Bombus ignites using qRT-PCR. The expression of BiOr816 located in the head of 10-day-old worker bees was utilized as the control, and its expression was then analyzed in different tissues of 1, 5, 10, 15, 20, 25 and 30-day-old specimens. The results showed that (Fig. 6 ) the expression of BiOr816 changed significantly according to increasing age among different tissues, and its expression in the antennae was obviously higher than that of other tissues within 1–30 days (P༜0.01). Moreover, the fluctuations in antennal expression among the analyzed days were not found to be significant. Specifically, antennae had lower expressions at 1-day-old, then slowly increased; however, it suddenly decreased at 15-day-old, rebounding to its peak value at 25-day-old, which declined afterward. While the abdomen possessed the lowest levels of expression in all tissues, antennae expression was observed to be about 299–759 times higher than that in the abdomen at the same age. In contrast, in terms of the feet and wings, no significant differences were present, though their expressions were slightly higher than that of the thorax. Additionally, the expression of BiOr816 in all tissues decreased significantly at the age of 15 days, which may be because day 15 was the transition stage from house bees to field bees, resulting in lower levels of expression of this odorant receptor. The expression level of each tissue also decreased significantly after 30 days, indicating that the expression level of odorant receptor proteins would gradually decrease when the bumblebees had entered the aging stage. Overall, the results demonstrated that antennae played a vital role in the process of olfactory recognition in bumblebees, which was the most important olfactory organ in bumblebees. Discussion The proteins of general odorant receptors are highly diverse in insects, which also holds true for the conservative co-receptor family (Gao and Chess 1999 ). Bumblebees are able to feel the volatility of the surrounding environment through their sense of smell. The antennae of the bumblebees possess a large number of olfactory receptors, which are particularly important for foraging, coupling, reproduction, and avoiding dangerous enemies (Hu et al. 2013 ). In Bombus ignites , a number of olfactory neurons express sex pheromone receptors in order to increase their sensitivity in responding to pheromones. The process entailing bumblebees’ recognition of external scent molecules is very complex, and it is comprised of numerous types of proteins, namely, odorant binding protein (OBPs), chemosensory proteins (CSPs), sensory neuron membrane protein (SNMPs) and odorant degrading enzymes (ODEs). Moreover, each olfactory receptor has many olfactory receptive neurons (Foret and Maleszka 2006 ), and external scent molecules were initially observed to form a complex with the odor-binding protein, subsequently passing through the lymph to reach the odor receptors. The odor receptors are stimulated to produce action potentials to generate the olfactory signals, which are then transmitted to the antennal lobe of the bumblebee’s brains via olfactory neurons. Accordingly, abstract information pertaining to the scent molecules were finally obtained, which guided the various behaviors of the bumblebees. Receptor proteins predicted to be expressed by the BiOr816 odorant gene were also found to possess the structural characteristics of G protein-coupled receptors (GPCR), such as 7 lipophilic transmembrane regions, one glycosylation site and three phosphorylation sites. In addition, its N-terminal was intracellularly located, while its C-terminal was located outside the cell, consistent with the results of PxylOr18 in Plutella xylostella (Kong et al. 2015) as well as AcerOr1 and AcerOr3 in Apis cerana (Zhao et al. 2014 ), which is a structure mosaic found in the phospholipid bilayer of olfactory receptor neuron cell membranes. The BiOr816 gene may have activated the G protein after producing cAMP with a slow and long ion conduction duration under cAMP stimulation, thereby promoting olfactory signal transduction. However, unlike vertebrate G protein-coupled receptor topology, the extracellular second loop of the BiOr816 protein does not contain two cysteines at the end of the fifth transmembrane region. Generally, a high degree of variation is present in the third, fourth, and fifth transmembrane regions. The different domains of insect odorant receptors in vertebrates may be due to the formation of different olfactory systems during evolution, making proteins very different in structure. In the present study, a putative odorant receptor gene BiOr816 in Bombus ignites was identified. The BiOr816 amino acid sequence was observed to share many similar characteristics with that of the Bombus terrestris BtOr22c orthologue. Interestingly, homologs of BiOr816 were not observed in other insects outside of Bombus . In general, Ors exhibited a high sequence divergence among insects including classical model insects (Hill et al. 2002 ). These observations were consistent with the ancient origin of the OR family. As demonstrated by this study’s constructed phylogenetic tree, BiOr816 was found to be more closely related to BtOr22c , BtOr9a and BtOr13a of Bombus terrestris . However, it showed less homologous homology with the genus of Formica or other genera of Hymenoptera . Accordingly, different insects may be observed to have different olfactory signals to the same scent molecules, leading to a high degree of variation in their odor receptor genes (Vikas et al. 2006). This result molecularly confirms the traditional phylogenetic classes of bees (Robertson and Wanner 2006 ), suggesting that BiOr816 belongs to a typical odorant-receptor protein family in Bombus ignites . Bombus ignites are social insects, where worker bees take on different aspects of work according to their physiological age. They served as house bees before 18-day-old and were responsible for various tasks like incubation, secreting beeswax, making bee’s spleen, cleaning, and feeding larvae and the queen bee. After 18-day-old worker bees become more mature, they gradually start gathering nectar and water outside of their hive. The above theoretical analysis aligns with that of the proposed experiment regarding BiOr816 gene expression. The obtained results demonstrated that the expression of BiOr816 suddenly dropped at 15-days of age, which was presumably due to its transitional stage when house bees become field bees, as they are influenced by changes in the environment, hormones as well as other factors, leading to the odorant receptors with low levels of expression. However, its levels of expression also illustrated a declining trend from 25-days of age, which may be due to field bees taking on more work than their 10-day-old counterparts, a decline in learning ability, the accompanying oxidative damage from brain proteins and lipids, and the decrease in synapses and neurons, which increase worker bee mortality (Dukas 2008 ; Munch et al. 2010 ). Olfaction is the process in which bumblebees sense volatiles in their surroundings. There are four kinds of receptors on the antennae of Bombus ignites worker bees: plate sensilla, piercing sensilla, hairy sensilla and cavity sensilla, which are particularly important for foraging, courtship, reproduction, and avoiding hostile confrontations. Numerous studies have shown that sensilla trichodea and sensilla basiconca possess olfactory functions, of which sensilla trichodea are mainly sensitive to external hormones, while sensilla basiconca are mainly sensitive to mechanical sensation, liquid chemical sensation and external common odors such as plant odors and odors emitted by natural enemies and other stimuli (Almaas and Mustaparta 1991 ; Gnatzy et al. 1984 ; Ljungberg et al. 1993 ; Steinbrecht 1970 ; Steinbrecht and Gnatzy 1984 ). Sensilla coeloclnica sense water vapor, carbon dioxide, humidity changes, and plant odors, and large cavity cones may also have olfactory functions (Mclver 1982 ). Furthermore, sensilla placodea may also possess functions in olfaction (Steinbrecht et al. 1992 ; Steinbrecht et al. 1995 ). The expression of BiOr816 changed significantly in different tissues, and expression in the antennae was observed to be the highest in each worker bee and significantly higher than that in other tissues, indicating that antennae are the main olfactory organs of Bombus ignites . Conclusion In the paper, we firstly confirmed the structure of the odor receptors in Bombus ignites , and its gene expression, which tested that antennae are the main olfactory receptive organs of Bombus ignites in regard to electron microscopy of antennae and odor receptor gene expression. Furthermore, the evaluation of antennae olfactory function was completed according to the receptors distributed on the antennae. Consequently, BiOr816 was observed to play a crucial role in the olfactory recognition process of Bombus ignites , providing the foundation for further studies pertaining to odorant receptor gene function and mechanisms associated with olfactory recognition for Bombus ignites . According to the physical and chemical properties of the protein, we believed that BiOr816 was the G-protein-coupled receptors have similar biological effects like other insects. Declarations Acknowledgements: We thank Dr. Lin. Hao and Dr. Wan-qi Xue (Shenyang Normal University) for their help. This research was financially supported by the National Natural Science Foundation of China (31370400 and 851800501) and Science Public Welfare Research Project of Liaoning Province (2013002012). Author’s contributions: Dan-Dan Wang conducted the experiments, interpreted the data and prepared the figures and tables, then wrote the paper. Xiao-Hong Li and Xing Wang carried out the collections, helped interpret the data and gave their helpful discussion and comments on the manuscript. All authors read and approved the final manuscript. Competing interests: The authors declare that they have no competing interests to declare. Availability of data and materials: All data generated or used during the study appear as stated in the article. Consent for publication: Not applicable. Ethics approval consent to participate: Not applicable. References Almaas, T., Mustaparta, H. 1991. Heliothis virescens : Response charactersstics of receptor neurons in sensilla trichodea Type 1 and Type 2. J. Chem. Ecol., 17(5): 953-972. Axel, B., Dorothea, B. 2001. Structural differences in the drone olfactory system of two phylogenetically distant Apis species, A. florea and A. mellifera. Naturwissenschaften, 88: 78–81. Chen, Y.O., Li, K., Zhang, D. 2013. 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Steinbrecht, R.A., Ozaki, M., Ziegelberger, G. 1992. Immunotytochemical localization of pheromone-binding protein in moth antennae. Cell and Tissue Research, 270: 287-302. Steinbrecht, R.A., Laue, M., Ziege, G. 1995. Immunocytochemical of pheromone-binding protein and general odorant binding protein in olfactory sensilla of the silk moth Antheraea and Bombyx . Cell Tissue Res., 282: 203-217. Thompson, J.D., Higgins, D.G., Gibson, T.J. 1994. CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and Weight matrix choice. Nucleic Acids Res., 22: 4673–4680. Vikas, T., Snehal, D.K., Ramanathan, S. 2019. Topology prediction of insect olfactory receptors. Curr. Opin. Struc. Biol., 55: 194–203. Villar, G., Baker, T.G., Patch, H.M. 2015. Neurophysiological mechanisms underlying sex- and maturation-related variation in pheromone responses in honey bee ( Apis mellifera ) . J. Comp. Physiol. A., 201: 731–739. Wang, D.D., Yang, D.X. 2017. Development and characterization of EST-SSRs for Musidae (Diptera) and their cross-genera transferability. Entomol. Fennica, 28: 148–156. Wang, Y, Han, L., Dong, J. (2017). Identification and characteristics of odorant receptor in Bumblebee, Bombus lantschouensis . Sci. Agric. Sin., 50: 1904–1913. Xue, W.Q., Wang, D.D. 2007. Five new species of Drymeia Meigen from Tibet Plateau, China (Diptera: Muscidae). Zootaxa, 1444: 35-51. Xue, W.Q., Wang, D.D., Wang, M.F. 2009. Three new species of Drymeia Meigen (Diptera: Muscidae) from the Qinghai-Xizang (Tibet) Plateau, China. Entomologica, 20: 84-93. Zhang, Q., Dong, X. 2011. Advances in the studies of honey Bees olfactory receptor genes. J. Bee, 12: 17–19. Zhang, Y.C., Fan, M.M., An, S.H. 2013. Molecular cloning and tissue-specific expression of odorant receptor OR18 gene from Helicorerpa assulta (Guenee). J. Henan Agric. University, 2: 50–535. Zhang, L.Y., Jiang, B.H., Ni, C.X. 2012. Craft expression and subcellular localization of Chinese bee Orco olfactory receptor gene. J. Entomol. 55: 1246–1254. Zhao, H.T., Gao, P.F., Du, H.Y. 2014. Molecular characterization and differential expression of two duplicated odorant receptor genes, AcerOr1 and AcerOr3, in Apis cerana cerana . J. Genet., 93: 53–61. Zhao, H.T., Gao, P.F., Zhang, G.X. 2015. Expression and localization analysis of the odorant receptor gene orco in drones’ antennae of Apis cerana cerana . Sci. Agric. Sin., 48: 796–803. Zhang, Z.X., Zhang, M.P., Wang, G.R. 2016. Cloning and characterization of an odorant receptor gene ALucoR40 in Apolygus lucorum (Hemiptera: Miridae). Acta Entomol. Sin., 59: 592–601. Tables Table 1 The information of EST-SSR primers Primer GenBank ID Sequence （5’→ 3’） Temperature Tm(℃) Product (bp) Percentage of polymorphic bands (PPB %) BI02 BI517258 ATAGAGGGATGAAAAGGGGG TTCCTGCGCTCAACTTCTTT 60 270—280 100.00 BI05 BI517189 AAAGAAGCGTGAAAGGGGAT CGATTACGTGTGCGATTACG 61 250—260 86.91 BI06 BI517175 GATTGTTTTCTCGCTGCTCC CTCGATGATATCGCTCGTCA 60 210—230 92.87 BI07 BI517174 GCATCCCTTTCCTGTTTCCT TCCAATGATCTCTCGGTGGT 61 180—210 89.31 BI09 BI517090 CTCTGATTAACACGCGACGA TCACTGTATTGCGGTGTGGT 61 210—230 79.68 BI15 BI516965 CATCTCTCGCTCTCGCTCTT CTTATCCTTGTCGTGATGTCG 59 270—280 100.00 BI16 BI51696 TGGGTGTTGTCCGTGTATGT GGGCTCGCTTTCACGTAAT 60 270—280 96.66 BI17 BI516954 TCACCAGGTGCAGAAAGAAA TCGTTGAAATGGAAACGTGA 60 240—250 81.97 BI18 BI516952 CATCCGGTCTTCTATCCGTC AAGTAAATCGGCCCTGTGTG 60 250—260 100.00 BI19 BI516965 GTGAAGGATCGAATCGAGGA ACGTGTTGCGAGCGTTTTAT 61 210—230 100.00 BI20 BI516965 CATCTCTCGCTCTCGCTCTT CTTATCCTTGTCGTGATGTCG 59 270—280 100.00 BI21 BI516961 TGGGTGTTGTCCGTGTATGT GGGCTCGCTTTCACGTAAT 60 270—280 87.36 BI22 BI516954 TCACCAGGTGCAGAAAGAAA TCGTTGAAATGGAAACGTGA 60 240—250 91.58 BI23 BI516952 CATCCGGTCTTCTATCCGTC AAGTAAATCGGCCCTGTGTG 60 250—260 100.00 BI24 BI516935 TTCAATGTATGTGAGAGAGCGA CATTGAAAACATTTTATTCAGT 59 230—240 91.67 BI25 BI516934 ATCGATACGACGCGAGATTC CGAACAAGAGAATTTTCGGC 60 240—250 87.61 BI26 BI516927 CGTAACTTGGGACAAGGGAA CGAATAAGATAACGAACGGTG 60 260—270 75.97 BI27 BI516913 GGGATACTTGCACCGATCAT CATTGTACGCCTCCAAGTGA 60 260—270 100.00 BI28 BI516816 CGAGATTCGGAACGATTTCA GATTCACACTCGATTGCCAC 61 260—270 99.67 BI29 BI516791 TGCATTTCAACTGTTATGCA ACGCACGCACGTATATGCT 60 260—270 88.93 BI30 BI516780 TGCGGTTGTATGTTTCGTGT ACCGACTTGAAACAACCTG 61 250—270 100.00 BI31 BI516778 TTGGTAAAGAAGGCAGGGA CTCGATATTGTTGCAGCGAG 60 260—270 100.00 BI32 BI516725 TTGGCACATCCAAGAATTGA ATTCAAGCCGACTTTAGCAA 60 200—210 73.82 BI33 BI516616 TAATCGGTCGTCTCCACAGA CGACGAAGCAGCAAGTGTA 60 260—270 78.66 BI34 BI516593 TGCGTTTGTATTGCGATGTC TTCGCGATAGAATCGACAG 60 280—300 92.87 BI35 BI516426 TCGAGCCCTATCACAGACG CTCGTTCGAGGTGTTCGAT 59 190—210 99.62 BI36 BI516434 GATCGGCGCAAACTTAGCTA CACCTATCGTGTGCATGTGT 60 260—280 90.87 BI37 BI516419 CGACACGAAGAGGGAGAGT TTAAAGCGTCATTCGTGTGC 60 200—210 100.00 BI38 BI516410 AATTCGCGAACTCCTCTAAAT CGATACGTGCATTCTAACTA 59 280—300 100.00 BI39 BI516361 ACCGTTGACGTCGATTTCTC TAGATGTCGCCAAATAACGC 60 200—210 100.00 Table 2 Primers used to BiOr816 gene clone and qRT-PCR Gene Sequence (5’→ 3’) BiOr816 F: CGCCGATCGTCATCGACTAA R: GCACAATGTTGGGTAGCACG Quantitative Real-time PCR primers: BiOr816 F: CCTAAGCACTACTTTGCCTA R CAGCGAAACGATTAGTCCAA reference gene: β—actin F: GCGCGACATTAAGGAGAAAC R: CCATACCCAGGAAGGAAGGT Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-41451","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research article","associatedPublications":[],"authors":[{"id":867096,"identity":"4ed2d6a9-1b1e-4009-b068-443ae92c0b38","order_by":0,"name":"Dandan Wang","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA6ElEQVRIiWNgGAWjYLACHgYGxgYQ4wODBIlaGGeQrIWZhxjVBsfPHn7xpuaObP/s9oe3bf5Y5PE3MD98dAOfljN5aZZzjj0znnHnjLF1bptEscQBNmPjHDxazA7kmBnzsB1ObLiRwyad2yCR2HCAh00ar5bzb4Ba/h1OnH8j/Zm0xR+JxPkEtdzIMX7M23Y4ccONBDNpBjaJxA2EtNjfeGPGOLfvsPFGoF7L3jaJxI2HCfhFsj/H+MObb4dl591If3jjx5+6xHnHmx8+xqcFCNjg0QdhMONXDlbyAVXLKBgFo2AUjAI0AADowlOjTHWN6AAAAABJRU5ErkJggg==","orcid":"https://orcid.org/0000-0002-5681-7488","institution":"eastern liaoning university","correspondingAuthor":true,"submittingAuthor":false,"prefix":"","firstName":"Dandan","middleName":"","lastName":"Wang","suffix":""},{"id":867097,"identity":"01752aa2-96f2-4320-ae98-6b8c9329b752","order_by":1,"name":"Xing Wang","email":"","orcid":"","institution":"Eastern Liaoning University","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Xing","middleName":"","lastName":"Wang","suffix":""},{"id":867098,"identity":"3667e9d9-3558-4d84-bc90-376242ddb9ba","order_by":2,"name":"Xiao-Hong Li","email":"","orcid":"","institution":"Eastern Liaoning University","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Xiao-Hong","middleName":"","lastName":"Li","suffix":""}],"badges":[],"createdAt":"2020-07-13 10:44:52","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-41451/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-41451/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":1623533,"identity":"f300490c-69c0-4a75-bbf8-219378443dbc","added_by":"auto","created_at":"2020-07-20 18:15:20","extension":"png","order_by":1,"title":"Figure 1","display":"","copyAsset":false,"role":"figure","size":913720,"visible":true,"origin":"","legend":"The SEM photographs of antennal sensilla of Bombus ignites\nNote: 1: sensillum placodeum; 2: sensillum coeloconicum; 3: sensillum trichodeum; 4: sensillum cavity","description":"","filename":"Onlinefloatimage1.Png","url":"https://assets-eu.researchsquare.com/files/rs-41451/v1/Onlinefloatimage1.Png"},{"id":1623534,"identity":"1d8c0036-c7f2-4283-a6d3-0b3bd6c7df4e","added_by":"auto","created_at":"2020-07-20 18:15:20","extension":"png","order_by":2,"title":"Figure 2","display":"","copyAsset":false,"role":"figure","size":45829,"visible":true,"origin":"","legend":"Nucleotide and translated amino acid sequences of BiOr816 cDNA of Bombus ignites\nNote: The red letters were 7 trans-membrane domains","description":"","filename":"OnlineFIGURE2.Png","url":"https://assets-eu.researchsquare.com/files/rs-41451/v1/OnlineFIGURE2.Png"},{"id":1623535,"identity":"70c82dcb-02dc-457a-8d87-8a02a3503f90","added_by":"auto","created_at":"2020-07-20 18:15:20","extension":"png","order_by":3,"title":"Figure 3","display":"","copyAsset":false,"role":"figure","size":113853,"visible":true,"origin":"","legend":"Three-dimensional structure of BiOr816 protein\nNote: Purple is the phosphorylation site of serine; yellow is the phosphorylation site of threonine; white is the phosphorylation site of threonine","description":"","filename":"OnlineFIGURE3.Png","url":"https://assets-eu.researchsquare.com/files/rs-41451/v1/OnlineFIGURE3.Png"},{"id":1623536,"identity":"1c928122-471c-4e8a-ab13-415c2ff52c0a","added_by":"auto","created_at":"2020-07-20 18:15:20","extension":"png","order_by":4,"title":"Figure 4","display":"","copyAsset":false,"role":"figure","size":201896,"visible":true,"origin":"","legend":"Homology comparison of amino acid sequence of Bombus ignites BiOr816 and other species\nNote: Bombus ignites BiOr816; Bombus terrestris BtOr22c (XP_012167618.1); Bombus terrestris BtOr13a-like (XP_012167489.1); Bombus impatiens BiOr22c-like (XP_033178691.1); Bombus vancouverensis nearcticus BvOr4-like (XP_033194243.1); Bombus impatiens BiOr4-like (XP_033178693.1); Bombus terrestris BtOr4-like (XP_012167616.1); Bombus terrestris BtOr4 (XP_012167493.1); Apis florea AfloOr67c-like (XP_012345844.1); Apis dorsata AdorOr67c-like (XP_006618840.1); Apis cerana AcerOr67c-like (XP_016916412.1); Ooceraea biroi ObOr13a (XP_011346647.1)","description":"","filename":"OnlineFIGURE4.Png","url":"https://assets-eu.researchsquare.com/files/rs-41451/v1/OnlineFIGURE4.Png"},{"id":1623537,"identity":"72bfc2aa-74bc-4e42-b097-103f0db37dee","added_by":"auto","created_at":"2020-07-20 18:15:20","extension":"jpg","order_by":5,"title":"Figure 5","display":"","copyAsset":false,"role":"figure","size":61089,"visible":true,"origin":"","legend":"Phylogenetic tree of Ors based on amino acid sequence of BiOr816 with neighbor-joining method","description":"","filename":"FIGURE5.jpg","url":"https://assets-eu.researchsquare.com/files/rs-41451/v1/FIGURE5.jpg"},{"id":1623538,"identity":"68e8cb8c-70c6-4269-8131-e02a62b330ad","added_by":"auto","created_at":"2020-07-20 18:15:21","extension":"png","order_by":6,"title":"Figure 6","display":"","copyAsset":false,"role":"figure","size":46915,"visible":true,"origin":"","legend":"Relative expression of BiOr816 in different stages and different tissues of Bombus ignites\nNote: The expression of BiOr816 in the head of worker bees at 10-days-old as the control quantity. The data was the expression of BiOr816 at different ages and tissues of Bombus ignite (mean±SE). “**” the difference was statistically very significant (P＜0.01), “*” the difference was statistically significant（P＜0.05), the following figures was the same as.","description":"","filename":"OnlineFIGURE6.Png","url":"https://assets-eu.researchsquare.com/files/rs-41451/v1/OnlineFIGURE6.Png"},{"id":15667926,"identity":"84890adc-a856-490c-b75e-41c6952b799b","added_by":"auto","created_at":"2021-11-18 13:45:40","extension":"pdf","order_by":0,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":3194724,"visible":true,"origin":"","legend":"","description":"","filename":"manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-41451/v1/9c3d38db-aefa-402d-95ae-ef9697ded27c.pdf"}],"financialInterests":"","formattedTitle":"\u003cp\u003eScanning electron microscopic observations of antennal sensilla, and the cloning and expression of the \u003cem\u003eBiOr816\u003c/em\u003e gene of \u003cem\u003eBombus ignites\u003c/em\u003e from China\u003c/p\u003e","fulltext":[{"header":"Introduction","content":" \u003cp\u003e \u003cem\u003eBombus ignites\u003c/em\u003e Smith belongs to the genus \u003cem\u003eBombus\u003c/em\u003e in the Apidae family and is an important native powdering-insect in China, distributed within Heilongjiang, Liaoning, Gansu, Hebei, Yunnan, and other provinces. It is vital in maintaining biodiversity and ecosystem balance (Zhang et al. \u003cspan citationid=\"CR40\" class=\"CitationRef\"\u003e2016\u003c/span\u003e; Xue et al. 2007). Bumblebees have very long mouthparts and have the ability to make contact with stigmas via high-frequencies when visiting flowers. They have demonstrated great resilience in low temperatures, reduced light conditions and highly humid environments; their abilities in adapting to various environmental conditions are significantly higher than that of honeybees (Fiach and Javier \u003cspan citationid=\"CR9\" class=\"CitationRef\"\u003e2019\u003c/span\u003e; Wang et al. \u003cspan citationid=\"CR32\" class=\"CitationRef\"\u003e2017\u003c/span\u003e). Unlike honeybees, bumblebees are able to resist harsh environments and undertake extended daily working times as well as single flower visit times, enabling them to better concentrate on pollinating greenhouse crops (David and Caroline \u003cspan citationid=\"CR5\" class=\"CitationRef\"\u003e2015\u003c/span\u003e). Above all, bumblebees increase the percentage of fertile fruit and yield, improving the quality of fruits and seeds. Moreover, they can avoid hormone pollution caused by plant growth regulators in flowers.\u003c/p\u003e \u003cp\u003eChemical receptors are critical for bumblebees to communicate with their external environments and with other individuals, which assists bumblebees in detecting chemical signals in the surrounding environment. Olfactory sensation can mediate the corresponding organs to recognize a plethora of scents in order to search for food and mates, identify companions and enemies, and avoid dangers in the external environment (Pask et al. \u003cspan citationid=\"CR20\" class=\"CitationRef\"\u003e2015\u003c/span\u003e; Janaina et al. \u003cspan citationid=\"CR6\" class=\"CitationRef\"\u003e2019\u003c/span\u003e;Wang and Yang \u003cspan citationid=\"CR31\" class=\"CitationRef\"\u003e2017\u003c/span\u003e). Taste sensation identifies soluble hormones, stimulating their innate mating behaviors (Zhang and Dong \u003cspan citationid=\"CR35\" class=\"CitationRef\"\u003e2011\u003c/span\u003e). The important proteins that participate in chemical signal reorganization include various kinds of differently sized gene-families, of which the chemoreceptor super-families hold particular importance. They are primarily made up of odorant receptors, gustatory receptors and ionotropic receptors (Silbering et al. \u003cspan citationid=\"CR23\" class=\"CitationRef\"\u003e2011\u003c/span\u003e; Xue et al. \u003cspan citationid=\"CR34\" class=\"CitationRef\"\u003e2009\u003c/span\u003e), where odorant receptors serve as critical components. Odorant receptors of insects include common odor receptors (ORs) and odor co-receptors (Orco). ORs are highly differentiated in different insects (Hu et al. \u003cspan citationid=\"CR11\" class=\"CitationRef\"\u003e2013\u003c/span\u003e), while the Orco of insects are comprised of just one type and are highly conserved (Ma et al. \u003cspan citationid=\"CR17\" class=\"CitationRef\"\u003e2014\u003c/span\u003e).\u003c/p\u003e \u003cp\u003eThus far, few reports exist regarding the study of odor receptor genes in \u003cem\u003eBombus ignites\u003c/em\u003e. According to past studies, insect odor receptor genes are generally believed to be G-protein-coupled receptors. This study speculates that odor receptors in \u003cem\u003eBombus ignites\u003c/em\u003e may have similar biological effects; in addition, this study attempts to confirm that antennae are the main olfactory receptive organs of \u003cem\u003eBombus ignites\u003c/em\u003e in regard to electron microscopy of antennae and odor receptor gene expression. Furthermore, the evaluation of antennae olfactory function was completed according to the receptors distributed on the antennae. Consequently, BiOr816 was observed to play a crucial role in the olfactory recognition process of \u003cem\u003eBombus ignites\u003c/em\u003e, providing the foundation for further studies pertaining to odorant receptor gene function and mechanisms associated with olfactory recognition for \u003cem\u003eBombus ignites\u003c/em\u003e.\u003c/p\u003e "},{"header":"Materials And Methods","content":"\u003cdiv id=\"Sec3\" class=\"Section2\"\u003e\n\u003ch2\u003eBumblebee materials\u003c/h2\u003e\n\u003cp\u003eThe \u003cem\u003eBombus ignites\u003c/em\u003e specimens used in this study were bred at the bee research institute of Eastern Liaoning university (40.13\u0026deg;N, 124.37\u0026deg;E). Each hive had a mature egg-laying queen and five frames, a feeding temperature of 28℃\u0026plusmn;0.5℃, humidity of 50%\u0026plusmn;5% and were kept without light.\u003c/p\u003e\n\u003cp\u003eThis investigation analyzed disease-free worker bees, where worker bees were immediately stored in liquid nitrogen for subsequent cloning for the target gene. Next, worker bees that immediately came out of the hive after eclosion were marked as 1-day-old with non-toxic and tasteless paint and were then marked every five days from sexually immaturity to maturity, putting them back after marking. Samples were selected on the 1st, 5th, 10th, 15th, 20th, 25th and 30th day, respectively. Afterward, the insects were used for the \u003cem\u003eBiOr816\u003c/em\u003e gene expression analysis (Villar et al. \u003cspan class=\"CitationRef\"\u003e2015\u003c/span\u003e). In each group, 30 worker bees were randomly collected each time, with three biological replicates from different colonies being examined, where one replicate contained five bumblebees. The experiments were conducted in the genetic engineering laboratory of eastern Liaoning University during the spring of 2018, when nectar and pollen were abundant in the natural environment.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec4\" class=\"Section2\"\u003e\n\u003ch2\u003eElectron microscopic scanning of antennal receptors\u003c/h2\u003e\n\u003cp\u003eThe antennae of the \u003cem\u003eBombus ignites\u003c/em\u003e specimens were soaked in 2.5% glutaraldehyde for 24 hours, which were then cleaned using ultrasonic waves and put it into potassium iodide, an electrically conductive liquid. Next, dewatering and drying were carried out using tertiary butyl alcohol after washing the antennae with distilled water (Chen et al. \u003cspan class=\"CitationRef\"\u003e2013\u003c/span\u003e). The samples were then photographed, and the antennae sensilla were scanned using a Hitachi S-4800 electron microscope.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec5\" class=\"Section2\"\u003e\n\u003ch2\u003eTotal RNA extraction\u003c/h2\u003e\n\u003cp\u003eThe antennae, head, thorax, abdomen, legs and wings of the \u003cem\u003eBombus ignites\u003c/em\u003e specimens were dissected with ophthalmic forceps and crushed with a mortar and pestle. The tissue homogenates were placed into Eppendorf tubes filled with liquid nitrogen (Zhang et al. \u003cspan class=\"CitationRef\"\u003e2013\u003c/span\u003e), where the powder was then put into another Eppendorf tube with 1.5\u0026nbsp;ml RNA-free Trizol (4℃). The total RNA was extracted using a Takara insect total RNA isolation kit, and the RNA integrity was detected. The cDNA was synthesized from the total RNA isolated from antennae using the Primer-Script RT reagent kit (Takaka, \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e\u003ca href=\"http://www.takara-bio.com\" target=\"_blank\"\u003ewww.takara-bio.com\u003c/a\u003e\u003c/span\u003e\u003c/span\u003e) according to the manufacturer\u0026rsquo;s instructions (Zhao et al. \u003cspan class=\"CitationRef\"\u003e2015\u003c/span\u003e; Liu et al. \u003cspan class=\"CitationRef\"\u003e2015\u003c/span\u003e). The first cDNA strand was synthesized with total RNA as its template and Oligo-dT as its primers, which were stored in a freezer at -80℃ until use. All of the above utilized medicine was purchased from Sangon Biotech (Sangon Biotech Shanghai, China Co., Ltd).\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec6\" class=\"Section2\"\u003e\n\u003ch2\u003eEST-SSR primers development and screening\u003c/h2\u003e\n\u003cp\u003eAll of the available \u003cem\u003eBombus ignites\u003c/em\u003e EST sequences up to March 26, 2018 were downloaded from the GenBank/NCBI EST database (National Center for Biotechnology Information, \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttp://www.ncbi.nlm.nih.gov\u003c/span\u003e\u003c/span\u003e). To develop the EST-SSR primers, the following steps were performed. Using Perl software (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e\u003ca href=\"http://www.takara-bio.com\" target=\"_blank\"\u003ewww.perl.org\u003c/a\u003e\u003c/span\u003e\u003c/span\u003e), all 5068 bumblebee EST sequences were assembled in FASTA format. The Blastclust software (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e\u003ca href=\"http://www.takara-bio.com\" target=\"_blank\"\u003ewww.Ncbi.nlm.nih.gov\u003c/a\u003e\u003c/span\u003e\u003c/span\u003e\u003cem\u003e)\u003c/em\u003e was then used to search for redundant sequences in all EST sequences. Then, using the CD-HIT software (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttp://weizhongli-lab.org/cd-hit/\u003c/span\u003e\u003c/span\u003e), the short (\u0026lt;\u0026thinsp;100\u0026nbsp;bp) and long sequences (\u0026gt;\u0026thinsp;700\u0026nbsp;bp) were removed, along with the 5\u0026rsquo;-hat and 3\u0026rsquo;-poly tail (A or T) of mRNA using the EST-TRIMMER software. The MISA.PL software was used to search, identify and locate SSR sites, and primer 3.0 was used to develop the EST-SSR primers. The designed parameters for the EST-SSR primers were as follows: length of 20\u0026ndash;26\u0026nbsp;bp, annealing temperature (Tm) of 55\u0026ndash;65\u0026nbsp;\u0026deg;C, content of G\u0026thinsp;+\u0026thinsp;C of 30\u0026ndash;70%, and length of PCR amplification product larger than 150\u0026nbsp;bp. Finally, BLAST was used to test the developed primers. The primers were synthesized by Sangon Biotech (Sangon Biotech Shanghai, China Co., Ltd) (Table\u0026nbsp;1).\u003c/p\u003e\n\u003cp\u003eThe developed EST-SSR primers were used to PCR amplify the DNA samples of the bumblebees. The amplified fragments were separated and analyzed using 6% polyacrylamide gel electrophoresis for 1.5\u0026nbsp;h (constant power 55\u0026nbsp;W, DNA marker GsDL0501 from 50\u0026nbsp;bp to 500\u0026nbsp;bp). The primers were tested and screened three times; of the screened primers, those that were amplified as stable, polymorphic and clear bands were chosen to be in the final study.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec7\" class=\"Section2\"\u003e\n\u003ch2\u003eCloning of BiOr816\u003c/h2\u003e\n\u003cp\u003eSince odorant receptors are distributed mainly in the antennae, and their expression patterns are especially enriched in bumblebee antennae, the antennae were used for cloning (Brockmann et al. 2001). The primers used to amplify \u003cem\u003eBiOr816\u003c/em\u003e (Table\u0026nbsp;\u003cspan class=\"InternalRef\"\u003e2\u003c/span\u003e) were designed using the primer premier 5.0 software (Premier Biosoft International Co., Palo, CA) using the input mRNA sequence of the odorant receptor gene \u003cem\u003eBtOr22c\u003c/em\u003e (Accession number: XM_012312228.1), which was already reported in GenBank.\u003c/p\u003e\n\u003cp\u003eThe PCR thermocycling conditions were: 94℃ for 3\u0026nbsp;min, followed by 30 cycles at 94℃ for 30\u0026nbsp;s, 59℃ for 45\u0026nbsp;s, 72℃ for 3\u0026nbsp;min, and a final extension at 72℃ for 10\u0026nbsp;min. PCR reactions: 2.5 \u0026micro;L 10\u0026thinsp;\u0026times;\u0026thinsp;reaction buffer, 1.5 \u0026micro;L 2.5 mmol\u0026middot;L\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e of each dNTPs, 0.5\u0026micro;L 200U mL\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e Taq DNA polymerase, 1 \u0026micro;L 10 \u0026micro;mol\u0026middot;L\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e each of forward and reverse primers, 50\u0026ndash;100\u0026nbsp;ng tissue homogenate, and 1.5 \u0026micro;L 1.5\u0026nbsp;mmol L\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e MgCl\u003csub\u003e2\u003c/sub\u003e. Double-distilled water was then added to achieve a total of 20 \u0026micro;L reaction volume. The PCR products were then resolved using electrophoresis on a 1% agarose gel and purified using a Gel Extraction Kit (Cwbiotech, \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003e\u003ca href=\"http://www.takara-bio.com\" target=\"_blank\"\u003ewww.cwbiotech.bioon.com.cn\u003c/a\u003e\u003c/span\u003e\u003c/span\u003e). Next, the purified products were ligated into a pEASY-T3 Clone Vector and were subsequently transformed into a Trans 5\u0026alpha; Chemically Competent Cell (TransGen Biotech) (Zhang et al. \u003cspan class=\"CitationRef\"\u003e2012\u003c/span\u003e). Positive clones were screened and sequenced by Sangon Biotech.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec8\" class=\"Section2\"\u003e\n\u003ch2\u003eSequence analysis\u003c/h2\u003e\n\u003cp\u003eAfter sequencing, the cDNA sequence of \u003cem\u003eBiOr816\u003c/em\u003e was obtained by assembling the forward and reverse sequencing reads using the SeqMan program in the DNAstar 5.0 software (Lynnon Biosoft, Quebec, Canada). The online software ORF Finder (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttp://www.ncbi.nlm.gov/gorf/gorf.html\u003c/span\u003e\u003c/span\u003e) was used to search for the open reading frame (ORF) of the sequence. The amino acid sequence was then translated using the DNAMAN software. Similarity searches were conducted using the BlastP program on the NCBI website (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttp://blast.Ncbi.nlm.nih.gov/Blast.cgi\u003c/span\u003e\u003c/span\u003e). The isoelectric point (pI) and molecular weights (MW) were computed using Compute pI/MW (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttp://www.expasy.ch/tools/pi_tool.html\u003c/span\u003e\u003c/span\u003e). The transmembrane helix (TMH) was predicted using the TMHMM Server v.2.0 (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttp://www.cbs.dtu.dk/services/TMHMM\u003c/span\u003e\u003c/span\u003e). Alignments of multiple sequences were carried out using the ClustalX progam (Thompson, Higgins, \u0026amp; Gibson, \u003cspan class=\"CitationRef\"\u003e1994\u003c/span\u003e). The phylogenetic tree was constructed using MEGA 7.0 (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttp://www.megasoftware.net/index.php\u003c/span\u003e\u003c/span\u003e) with the neighbor-joining method. A portion of sequences for known Ors of bumblebees were acquired from GenBank.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec9\" class=\"Section2\"\u003e\n\u003ch2\u003eExpression of BiOr816\u003c/h2\u003e\n\u003cp\u003eTotal RNA was isolated from the antennae, heads, thoraces, abdomens, and legs of adult worker bees to determine the expression of \u003cem\u003eBiOr816\u003c/em\u003e. The quantitative Real-Time PCR (qRT-PCR, ABI 7500 instrument) was performed using the SYBR Premix Ex Taq kit (Takara) in a total reaction volume of 20 \u0026micro;L. The reaction mixture was prepared adhering to the following parameters: SYBR Premix Ex Taq Ⅱ(2\u0026times;)10 \u0026micro;L, 0.8 \u0026micro;L 10 \u0026micro;mol\u0026middot;L-1 each of forward and reverse primers, 0.5 \u0026micro;L ROX Reference Dye (50\u0026times;), and 50\u0026ndash;100\u0026nbsp;ng cDNA, followed by the addition of double-distilled water to reach a total of 20\u0026nbsp;\u0026micro;l reaction volume. The primers (Table\u0026nbsp;\u003cspan class=\"InternalRef\"\u003e2\u003c/span\u003e) for qRT-PCR were designed using the primer premier 5.0 software, and the actin gene was used as the internal control. qRT-PCR was performed with an initial denaturation step of 10\u0026nbsp;min at 95℃, followed by 40 cycles at 94℃ for 30\u0026nbsp;s, and 72℃ for 40\u0026nbsp;s. A melting curve analysis was conducted to verify the specificity of amplification. The relative expression patterns of \u003cem\u003eBiOr816\u003c/em\u003e mRNA were calculated using the 2\u0026mdash;△△Ct comparative CT method (Schmittgen and Livak \u003cspan class=\"CitationRef\"\u003e2008\u003c/span\u003e). In order to ensure the accuracy and stability of the qRT-PCR results, under the same conditions, three parallel experiments should be done as biological replicates, with one replicate containing 10 bumblebees.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv id=\"Sec10\" class=\"Section2\"\u003e\n\u003ch2\u003eStatistical analysis\u003c/h2\u003e\n\u003cp\u003eDifferences in the relative expressions of the \u003cem\u003eBiOr816\u003c/em\u003e gene were determined using a \u003cem\u003et\u003c/em\u003e-test analysis in SPASS 17.0 (IBM, Armonk, NY). \u003cem\u003eP\u003c/em\u003e༜0.05 was considered to be statistically significant in all treatments.\u003c/p\u003e\n\u003c/div\u003e"},{"header":"Results","content":" \u003cdiv id=\"Sec12\" class=\"Section2\"\u003e \u003ch2\u003eScanning electron microscope photographs of the antennal receptors of Bombus ignites\u003c/h2\u003e \u003cp\u003eFour types of sensilla were observed on the antennae of worker bees through a scanning electron microscope (SEM), which are regarded as the main olfactory organ of bumblebees and were mainly distributed with sensillum placodeum and sensillum coeloconicum, though sensillum trichodeum and sensillum cavity were still present (Fig.\u0026nbsp;\u003cspan refid=\"Fig1\" class=\"InternalRef\"\u003e1\u003c/span\u003e). Sensillum placodeum has a disk-like shape, and many differently sized protrusions exist on its surface, which are closely distributed on the flagellum of the antennae. Around the sensillum placodeum, many sensillum coeloconicum were observed having short-nail-like features born in a mortar-like socket. The top of the sensillum trichodeum was slightly curved, and its base extended out from the sheath-like shape of the antennae surface, growing to the top. The sensillum cavity was sparsely distributed over the antennae, which depressed inward from the antennae surface. Here, many irregularly saw-tooth structures were present in the middle of the depressions.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec13\" class=\"Section2\"\u003e \u003ch2\u003eCloning and sequence analysis of BiOr816\u003c/h2\u003e \u003cp\u003eTo explore the molecular functions of \u003cem\u003eBombus ignites\u003c/em\u003e odorant receptor \u003cem\u003e816\u003c/em\u003e (\u003cem\u003eBiOr816\u003c/em\u003e), the cDNA sequence of \u003cem\u003eBiOr816\u003c/em\u003e containing the complete coding region was cloned. Its amino acids were predicted using the DNAMAN program, and the \u003cem\u003eBiOr816\u003c/em\u003e cDNA was found to possess a 5\u0026rsquo;-terminal untranslated region (UTR) of 39\u0026nbsp;bp, a 3\u0026rsquo;-terminal UTR of 67\u0026nbsp;bp, and an open reading frame (ORF) of 1158\u0026nbsp;bp encoding a polypeptide of 385 amino acids (Fig.\u0026nbsp;\u003cspan refid=\"Fig2\" class=\"InternalRef\"\u003e2\u003c/span\u003e). Through the ProtParam program (\u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttp://www.expasy.org/tools/protparam.html\u003c/span\u003e\u003c/span\u003e\u003cspan type=\"Underline\" class=\"Underline\" name=\"Emphasis\"\u003e)\u003c/span\u003e the molecular mass of the deduced \u003cem\u003eBiOr816\u003c/em\u003e protein was predicted to be 48.17\u0026nbsp;kDa, its molecular formula was C\u003csub\u003e3592\u003c/sub\u003eH\u003csub\u003e6021\u003c/sub\u003eN\u003csub\u003e1165\u003c/sub\u003eO\u003csub\u003e1502\u003c/sub\u003eS\u003csub\u003e235\u003c/sub\u003e, and the isoelectric point (pI) was calculated to be 5.06, which was acidic and uncharged. The hydrophilic coefficient of the \u003cem\u003eBiOr816\u003c/em\u003e protein was 0.769, and its instability index was computed to be 50.31, indicating that the protein was unstable and hydrophobic. Moreover, the \u003cem\u003eBiOr816\u003c/em\u003e protein belongs to the 7-transmembrane_6 receptors superfamily, which consists of 7 trans-membrane domains: TM-Ⅰ(28\u0026ndash;54), TM-Ⅱ(95\u0026ndash;116), TM-Ⅲ(126\u0026ndash;148), TM-Ⅳ(187\u0026ndash;206), TM-Ⅴ(245\u0026ndash;265), and TM-Ⅵ(301\u0026ndash;320). Furthermore, the amino terminus of the protein was located in the membranes, with three phosphorylation sites (Fig.\u0026nbsp;\u003cspan refid=\"Fig2\" class=\"InternalRef\"\u003e2\u003c/span\u003e and Fig.\u0026nbsp;\u003cspan refid=\"Fig3\" class=\"InternalRef\"\u003e3\u003c/span\u003e).\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec14\" class=\"Section2\"\u003e \u003ch2\u003eAmino acid sequence alignment and phylogenetic analysis\u003c/h2\u003e \u003cp\u003eTo determine the evolutionary relationship of \u003cem\u003eBiOr816\u003c/em\u003e with \u003cem\u003eBombus ignites\u003c/em\u003e and other species, a blast protein alignment and neighbor-joining tree were constructed for further identifying the relationships between the \u003cem\u003eBiOr816\u003c/em\u003e and other related protein sequences from 11plants already obtained (Fig.\u0026nbsp;\u003cspan refid=\"Fig4\" class=\"InternalRef\"\u003e4\u003c/span\u003e and Fig.\u0026nbsp;\u003cspan refid=\"Fig5\" class=\"InternalRef\"\u003e5\u003c/span\u003e). Comparison of the deduced amino acid sequence of \u003cem\u003eBiOr816\u003c/em\u003e to that of \u003cem\u003eBtOr22c\u003c/em\u003e (XM_012312228.1) revealed a high degree of identity of 98.2%. Similarly, alignments with the Ors of other insects exhibited high homology with \u003cem\u003eBtOr9a\u003c/em\u003e (NC_015772.1, identity 95.1%) and \u003cem\u003eBtOr13a\u003c/em\u003e (XM_0123091122, identity 92.6%). Using the deduced amino acid sequence of \u003cem\u003eBiOr816\u003c/em\u003e, a phylogenetic tree was constructed using the MEGA 7.0 software. The corresponding phylogenetic analysis demonstrated that \u003cem\u003eBiOr816\u003c/em\u003e and \u003cem\u003eBtOr22c\u003c/em\u003e belong to a single genus and is embodied by a high degree of identity. Alignments with the Ors of other insects homologous with \u003cem\u003eBiOr816\u003c/em\u003e are \u003cem\u003eFormica\u003c/em\u003e, \u003cem\u003eApis\u003c/em\u003e and \u003cem\u003eBombus\u003c/em\u003e; the homology of its amino acid is between 35% and 96%. The phylogenetic tree was divided into four branches, with the first branch belonging to \u003cem\u003eMessor orientalis\u003c/em\u003e, the second to \u003cem\u003eApis cerana ceran\u003c/em\u003e, \u003cem\u003eApis mellifera\u003c/em\u003e and \u003cem\u003eApis dorsat\u003c/em\u003e, the third to \u003cem\u003eBombus lantschouensis\u003c/em\u003e, \u003cem\u003eBombus terrestris\u003c/em\u003e and \u003cem\u003eBombus ignites\u003c/em\u003e, and the fourth to \u003cem\u003eDrosophila melanogaster\u003c/em\u003e. Accordingly, the \u003cem\u003eBombus ignites BiOr816\u003c/em\u003e sequence was found to be closely related to the \u003cem\u003eBombus terrestris\u003c/em\u003e odorant receptor \u003cem\u003eBtOr22c\u003c/em\u003e sequence and possesses a high level of homology, indicating that the \u003cem\u003eBiOr816\u003c/em\u003e sequence cloned in this study is the \u003cem\u003eBombus ignites\u003c/em\u003e odorant receptor gene and the BiOr816 protein had similar structure and likely shared some gene functions.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003c/div\u003e \u003cdiv id=\"Sec15\" class=\"Section2\"\u003e \u003ch2\u003eAnalysis of BiOr816 expression via qRT-PCR\u003c/h2\u003e \u003cp\u003eThe expression profiles of \u003cem\u003eBiOr816\u003c/em\u003e were characterized across different developmental stages and tissues of \u003cem\u003eBombus ignites\u003c/em\u003e using qRT-PCR. The expression of \u003cem\u003eBiOr816\u003c/em\u003e located in the head of 10-day-old worker bees was utilized as the control, and its expression was then analyzed in different tissues of 1, 5, 10, 15, 20, 25 and 30-day-old specimens. The results showed that (Fig.\u0026nbsp;\u003cspan refid=\"Fig6\" class=\"InternalRef\"\u003e6\u003c/span\u003e) the expression of \u003cem\u003eBiOr816\u003c/em\u003e changed significantly according to increasing age among different tissues, and its expression in the antennae was obviously higher than that of other tissues within 1\u0026ndash;30 days (P༜0.01). Moreover, the fluctuations in antennal expression among the analyzed days were not found to be significant. Specifically, antennae had lower expressions at 1-day-old, then slowly increased; however, it suddenly decreased at 15-day-old, rebounding to its peak value at 25-day-old, which declined afterward. While the abdomen possessed the lowest levels of expression in all tissues, antennae expression was observed to be about 299\u0026ndash;759 times higher than that in the abdomen at the same age. In contrast, in terms of the feet and wings, no significant differences were present, though their expressions were slightly higher than that of the thorax. Additionally, the expression of \u003cem\u003eBiOr816\u003c/em\u003e in all tissues decreased significantly at the age of 15 days, which may be because day 15 was the transition stage from house bees to field bees, resulting in lower levels of expression of this odorant receptor. The expression level of each tissue also decreased significantly after 30 days, indicating that the expression level of odorant receptor proteins would gradually decrease when the bumblebees had entered the aging stage. Overall, the results demonstrated that antennae played a vital role in the process of olfactory recognition in bumblebees, which was the most important olfactory organ in bumblebees.\u003c/p\u003e \u003cp\u003e \u003c/p\u003e \u003c/div\u003e "},{"header":"Discussion","content":" \u003cp\u003eThe proteins of general odorant receptors are highly diverse in insects, which also holds true for the conservative co-receptor family (Gao and Chess \u003cspan citationid=\"CR12\" class=\"CitationRef\"\u003e1999\u003c/span\u003e). Bumblebees are able to feel the volatility of the surrounding environment through their sense of smell. The antennae of the bumblebees possess a large number of olfactory receptors, which are particularly important for foraging, coupling, reproduction, and avoiding dangerous enemies (Hu et al. \u003cspan citationid=\"CR11\" class=\"CitationRef\"\u003e2013\u003c/span\u003e). In \u003cem\u003eBombus ignites\u003c/em\u003e, a number of olfactory neurons express sex pheromone receptors in order to increase their sensitivity in responding to pheromones. The process entailing bumblebees\u0026rsquo; recognition of external scent molecules is very complex, and it is comprised of numerous types of proteins, namely, odorant binding protein (OBPs), chemosensory proteins (CSPs), sensory neuron membrane protein (SNMPs) and odorant degrading enzymes (ODEs). Moreover, each olfactory receptor has many olfactory receptive neurons (Foret and Maleszka \u003cspan citationid=\"CR8\" class=\"CitationRef\"\u003e2006\u003c/span\u003e), and external scent molecules were initially observed to form a complex with the odor-binding protein, subsequently passing through the lymph to reach the odor receptors. The odor receptors are stimulated to produce action potentials to generate the olfactory signals, which are then transmitted to the antennal lobe of the bumblebee\u0026rsquo;s brains via olfactory neurons. Accordingly, abstract information pertaining to the scent molecules were finally obtained, which guided the various behaviors of the bumblebees. Receptor proteins predicted to be expressed by the \u003cem\u003eBiOr816\u003c/em\u003e odorant gene were also found to possess the structural characteristics of G protein-coupled receptors (GPCR), such as 7 lipophilic transmembrane regions, one glycosylation site and three phosphorylation sites. In addition, its N-terminal was intracellularly located, while its C-terminal was located outside the cell, consistent with the results of \u003cem\u003ePxylOr18\u003c/em\u003e in \u003cem\u003ePlutella xylostella\u003c/em\u003e (Kong et al. 2015) as well as \u003cem\u003eAcerOr1\u003c/em\u003e and \u003cem\u003eAcerOr3\u003c/em\u003e in \u003cem\u003eApis cerana\u003c/em\u003e (Zhao et al. \u003cspan citationid=\"CR38\" class=\"CitationRef\"\u003e2014\u003c/span\u003e), which is a structure mosaic found in the phospholipid bilayer of olfactory receptor neuron cell membranes. The \u003cem\u003eBiOr816\u003c/em\u003e gene may have activated the G protein after producing cAMP with a slow and long ion conduction duration under cAMP stimulation, thereby promoting olfactory signal transduction. However, unlike vertebrate G protein-coupled receptor topology, the extracellular second loop of the BiOr816 protein does not contain two cysteines at the end of the fifth transmembrane region. Generally, a high degree of variation is present in the third, fourth, and fifth transmembrane regions. The different domains of insect odorant receptors in vertebrates may be due to the formation of different olfactory systems during evolution, making proteins very different in structure.\u003c/p\u003e \u003cp\u003eIn the present study, a putative odorant receptor gene \u003cem\u003eBiOr816\u003c/em\u003e in \u003cem\u003eBombus ignites\u003c/em\u003e was identified. The \u003cem\u003eBiOr816\u003c/em\u003e amino acid sequence was observed to share many similar characteristics with that of the \u003cem\u003eBombus terrestris BtOr22c\u003c/em\u003e orthologue. Interestingly, homologs of \u003cem\u003eBiOr816\u003c/em\u003e were not observed in other insects outside of \u003cem\u003eBombus\u003c/em\u003e. In general, Ors exhibited a high sequence divergence among insects including classical model insects (Hill et al. \u003cspan citationid=\"CR10\" class=\"CitationRef\"\u003e2002\u003c/span\u003e). These observations were consistent with the ancient origin of the OR family. As demonstrated by this study\u0026rsquo;s constructed phylogenetic tree, \u003cem\u003eBiOr816\u003c/em\u003e was found to be more closely related to \u003cem\u003eBtOr22c\u003c/em\u003e, \u003cem\u003eBtOr9a\u003c/em\u003e and \u003cem\u003eBtOr13a\u003c/em\u003e of \u003cem\u003eBombus terrestris\u003c/em\u003e. However, it showed less homologous homology with the genus of \u003cem\u003eFormica\u003c/em\u003e or other genera of \u003cem\u003eHymenoptera\u003c/em\u003e. Accordingly, different insects may be observed to have different olfactory signals to the same scent molecules, leading to a high degree of variation in their odor receptor genes (Vikas et al. 2006). This result molecularly confirms the traditional phylogenetic classes of bees (Robertson and Wanner \u003cspan citationid=\"CR21\" class=\"CitationRef\"\u003e2006\u003c/span\u003e), suggesting that \u003cem\u003eBiOr816\u003c/em\u003e belongs to a typical odorant-receptor protein family in \u003cem\u003eBombus ignites\u003c/em\u003e.\u003c/p\u003e \u003cp\u003e \u003cem\u003eBombus ignites\u003c/em\u003e are social insects, where worker bees take on different aspects of work according to their physiological age. They served as house bees before 18-day-old and were responsible for various tasks like incubation, secreting beeswax, making bee\u0026rsquo;s spleen, cleaning, and feeding larvae and the queen bee. After 18-day-old worker bees become more mature, they gradually start gathering nectar and water outside of their hive. The above theoretical analysis aligns with that of the proposed experiment regarding \u003cem\u003eBiOr816\u003c/em\u003e gene expression. The obtained results demonstrated that the expression of \u003cem\u003eBiOr816\u003c/em\u003e suddenly dropped at 15-days of age, which was presumably due to its transitional stage when house bees become field bees, as they are influenced by changes in the environment, hormones as well as other factors, leading to the odorant receptors with low levels of expression. However, its levels of expression also illustrated a declining trend from 25-days of age, which may be due to field bees taking on more work than their 10-day-old counterparts, a decline in learning ability, the accompanying oxidative damage from brain proteins and lipids, and the decrease in synapses and neurons, which increase worker bee mortality (Dukas \u003cspan citationid=\"CR7\" class=\"CitationRef\"\u003e2008\u003c/span\u003e; Munch et al. \u003cspan citationid=\"CR19\" class=\"CitationRef\"\u003e2010\u003c/span\u003e). Olfaction is the process in which bumblebees sense volatiles in their surroundings. There are four kinds of receptors on the antennae of \u003cem\u003eBombus ignites\u003c/em\u003e worker bees: plate sensilla, piercing sensilla, hairy sensilla and cavity sensilla, which are particularly important for foraging, courtship, reproduction, and avoiding hostile confrontations. Numerous studies have shown that sensilla trichodea and sensilla basiconca possess olfactory functions, of which sensilla trichodea are mainly sensitive to external hormones, while sensilla basiconca are mainly sensitive to mechanical sensation, liquid chemical sensation and external common odors such as plant odors and odors emitted by natural enemies and other stimuli (Almaas and Mustaparta \u003cspan citationid=\"CR1\" class=\"CitationRef\"\u003e1991\u003c/span\u003e; Gnatzy et al. \u003cspan citationid=\"CR13\" class=\"CitationRef\"\u003e1984\u003c/span\u003e; Ljungberg et al. \u003cspan citationid=\"CR15\" class=\"CitationRef\"\u003e1993\u003c/span\u003e; Steinbrecht \u003cspan citationid=\"CR24\" class=\"CitationRef\"\u003e1970\u003c/span\u003e; Steinbrecht and Gnatzy \u003cspan citationid=\"CR25\" class=\"CitationRef\"\u003e1984\u003c/span\u003e). Sensilla coeloclnica sense water vapor, carbon dioxide, humidity changes, and plant odors, and large cavity cones may also have olfactory functions (Mclver \u003cspan citationid=\"CR18\" class=\"CitationRef\"\u003e1982\u003c/span\u003e). Furthermore, sensilla placodea may also possess functions in olfaction (Steinbrecht et al. \u003cspan citationid=\"CR26\" class=\"CitationRef\"\u003e1992\u003c/span\u003e; Steinbrecht et al. \u003cspan citationid=\"CR27\" class=\"CitationRef\"\u003e1995\u003c/span\u003e). The expression of \u003cem\u003eBiOr816\u003c/em\u003e changed significantly in different tissues, and expression in the antennae was observed to be the highest in each worker bee and significantly higher than that in other tissues, indicating that antennae are the main olfactory organs of \u003cem\u003eBombus ignites\u003c/em\u003e.\u003c/p\u003e "},{"header":"Conclusion","content":" \u003cp\u003eIn the paper, we firstly confirmed the structure of the odor receptors in \u003cem\u003eBombus ignites\u003c/em\u003e, and its gene expression, which tested that antennae are the main olfactory receptive organs of \u003cem\u003eBombus ignites\u003c/em\u003e in regard to electron microscopy of antennae and odor receptor gene expression. Furthermore, the evaluation of antennae olfactory function was completed according to the receptors distributed on the antennae. Consequently, BiOr816 was observed to play a crucial role in the olfactory recognition process of \u003cem\u003eBombus ignites\u003c/em\u003e, providing the foundation for further studies pertaining to odorant receptor gene function and mechanisms associated with olfactory recognition for \u003cem\u003eBombus ignites\u003c/em\u003e. According to the physical and chemical properties of the protein, we believed that BiOr816 was the G-protein-coupled receptors have similar biological effects like other insects.\u003c/p\u003e "},{"header":"Declarations","content":"\u003cp\u003e\u003cstrong\u003eAcknowledgements: \u003c/strong\u003eWe thank Dr. Lin. Hao and Dr. Wan-qi Xue (Shenyang Normal University) for their help. This research was financially supported by the National Natural Science Foundation of China (31370400 and 851800501) and Science Public Welfare Research Project of Liaoning Province (2013002012).\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eAuthor\u0026rsquo;s contributions: \u003c/strong\u003eDan-Dan Wang conducted the experiments, interpreted the data and prepared the figures and tables, then wrote the paper. Xiao-Hong Li and Xing Wang carried out the collections, helped interpret the data and gave their helpful discussion and comments on the manuscript. All authors read and approved the final manuscript.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompeting interests: \u003c/strong\u003eThe authors declare that they have no competing interests to declare.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eAvailability of data and materials: \u003c/strong\u003eAll data generated or used during the study appear as stated in the article.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eConsent for publication: \u003c/strong\u003eNot applicable.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eEthics approval consent to participate: \u003c/strong\u003eNot applicable.\u003c/p\u003e"},{"header":"References","content":"\u003cp\u003eAlmaas, T., Mustaparta, H. 1991. \u003cem\u003eHeliothis virescens\u003c/em\u003e: Response charactersstics of receptor neurons in sensilla trichodea Type 1 and Type 2. J. Chem. Ecol., 17(5): 953-972.\u003c/p\u003e\n\u003cp\u003eAxel, B., Dorothea, B. 2001. 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Sin., 59: 592\u0026ndash;601.\u003c/p\u003e"},{"header":"Tables","content":"\u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;line-height: 12pt;text-align: left;\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size: 10px; font-family: Verdana, Geneva, sans-serif; color: rgb(0, 0, 0);\"\u003eTable 1\u0026nbsp;\u003c/span\u003e\u003c/strong\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eThe information of EST-SSR primers\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n\u003ctable border=\"1\" cellpadding=\"0\" cellspacing=\"0\" style=\"width: 784px;border-collapse: collapse;border: none;\" width=\"100%\"\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border-top-width: 1pt;border-style: solid none;border-top-color: windowtext;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;height: 14.8pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003ePrimer\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border-top-width: 1pt;border-style: solid none;border-top-color: windowtext;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;height: 14.8pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eGenBank ID\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border-top-width: 1pt;border-style: solid none;border-top-color: windowtext;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;height: 14.8pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eSequence\u0026nbsp;（5\u0026rsquo;\u0026rarr; \u0026nbsp;3\u0026rsquo;）\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border-top-width: 1pt;border-style: solid none;border-top-color: windowtext;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;height: 14.8pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eTemperature Tm(℃)\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border-top-width: 1pt;border-style: solid none;border-top-color: windowtext;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;height: 14.8pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eProduct (bp)\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border-top-width: 1pt;border-style: solid none;border-top-color: windowtext;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;height: 14.8pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003ePercentage of polymorphic bands (PPB %)\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI02\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI517258\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eATAGAGGGATGAAAAGGGGG\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eTTCCTGCGCTCAACTTCTTT\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e60\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e270\u0026mdash;280\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e100.00\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI05\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI517189\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eAAAGAAGCGTGAAAGGGGAT\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eCGATTACGTGTGCGATTACG\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e61\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e250\u0026mdash;260\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e86.91\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI06\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI517175\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eGATTGTTTTCTCGCTGCTCC\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eCTCGATGATATCGCTCGTCA\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e60\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e210\u0026mdash;230\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e92.87\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI07\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI517174\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eGCATCCCTTTCCTGTTTCCT\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eTCCAATGATCTCTCGGTGGT\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e61\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e180\u0026mdash;210\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e89.31\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI09\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI517090\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eCTCTGATTAACACGCGACGA\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eTCACTGTATTGCGGTGTGGT\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e61\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e210\u0026mdash;230\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e79.68\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI15\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI516965\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eCATCTCTCGCTCTCGCTCTT\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eCTTATCCTTGTCGTGATGTCG\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e59\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e270\u0026mdash;280\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e100.00\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI16\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI51696\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eTGGGTGTTGTCCGTGTATGT\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eGGGCTCGCTTTCACGTAAT\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e60\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e270\u0026mdash;280\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e96.66\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI17\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI516954\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u0026nbsp;TCACCAGGTGCAGAAAGAAA\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eTCGTTGAAATGGAAACGTGA\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e60\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e240\u0026mdash;250\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e81.97\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI18\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI516952\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eCATCCGGTCTTCTATCCGTC\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eAAGTAAATCGGCCCTGTGTG\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border: none;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e60\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border: none;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e250\u0026mdash;260\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border: none;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e100.00\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 43.78125px;border: none;padding: 0in 5.4pt;\" width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI19\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI516965\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: 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width=\"7.216494845360825%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI36\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border: none;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI516434\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border: none;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: 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Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI39\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 76.46875px;border-style: none none solid;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;\" width=\"11.34020618556701%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eBI516361\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 220.984375px;border-style: none none solid;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;\" width=\"29.896907216494846%\"\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eACCGTTGACGTCGATTTCTC\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eTAGATGTCGCCAAATAACGC\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 113.53125px;border-style: none none solid;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;\" width=\"16.49484536082474%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e60\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 81.5625px;border-style: none none solid;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;\" width=\"12.371134020618557%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e200\u0026mdash;210\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003ctd style=\"width: 161.453125px;border-style: none none solid;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;\" width=\"22.68041237113402%\"\u003e\n \u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e100.00\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n\u003c/table\u003e\n\u003cp style=\"margin: 0in;text-align: center;font-size:14px;font-family: Calibri, sans-serif;line-height: 12pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u003cstrong\u003e\u0026nbsp;\u003c/strong\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n\u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;line-height: 12pt;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u003cbr\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n\u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;line-height: 12pt;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u003cbr\u003e\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n\u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;line-height: 12pt;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u003cstrong\u003eTable 2 \u0026nbsp;\u003c/strong\u003ePrimers used to\u003cem\u003e\u0026nbsp;BiOr816\u003c/em\u003e\u0026nbsp;gene clone and qRT-PCR\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n\u003ctable border=\"1\" cellpadding=\"0\" cellspacing=\"0\" style=\"width: 784px;border-collapse: collapse;border: none;\" width=\"100%\"\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 769.625px;border-top-width: 1pt;border-style: solid none;border-top-color: windowtext;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;height: 22.4pt;\" width=\"100%\"\u003e\n \u003cp style=\"margin: 0in;text-align: justify;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eGene \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;Sequence (5\u0026rsquo;\u0026rarr; \u0026nbsp;3\u0026rsquo;)\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd style=\"width: 769.625px;border-style: none none solid;border-bottom-width: 1pt;border-bottom-color: windowtext;padding: 0in 5.4pt;height: 75.15pt;\" width=\"100%\"\u003e\n \u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;vertical-align: middle;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u003cem\u003eBiOr816\u0026nbsp;\u003c/em\u003e\u003cem\u003e\u0026nbsp;\u003c/em\u003e\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;F: CGCCGATCGTCATCGACTAA\u0026nbsp;\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;vertical-align: middle;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;R: GCACAATGTTGGGTAGCACG\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;vertical-align: middle;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eQuantitative Real-time PCR primers:\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;vertical-align: middle;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u003cem\u003eBiOr816\u003c/em\u003e\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;F:\u003cspan style=\"background-color: white;\"\u003e\u0026nbsp;\u003c/span\u003eCCTAAGCACTACTTTGCCTA\u0026nbsp;\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;vertical-align: middle;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003eR CAGCGAAACGATTAGTCCAA\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;vertical-align: middle;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003ereference gene:\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;vertical-align: middle;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u003cem\u003e\u0026beta;\u0026mdash;actin \u0026nbsp; \u0026nbsp; \u0026nbsp;\u003c/em\u003e\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;F:\u003cspan style=\"background-color: white;\"\u003e\u0026nbsp;\u003c/span\u003eGCGCGACATTAAGGAGAAAC\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003c/p\u003e\n \u003cp style=\"margin: 0in;font-size:14px;font-family: Calibri, sans-serif;text-indent: 10.5pt;vertical-align: middle;text-align: left;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"font-family: Verdana, Geneva, sans-serif;\"\u003e\u003cspan style=\"font-size: 10px;\"\u003e\u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u003cspan style=\"font-size: 10px; font-family: Verdana, Geneva, sans-serif; color: rgb(0, 0, 0);\"\u003eR: CCATACCCAGGAAGGAAGGT\u003c/span\u003e\u003c/p\u003e\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n\u003c/table\u003e"}],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":true,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":false,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":false,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Bombus ignites, worker bees, scanning electron, odorant receptor gene, qRT-PCR, bioinformatics analysis","lastPublishedDoi":"10.21203/rs.3.rs-41451/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-41451/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eOdorant receptors play a crucial role in the special recognition of scent molecules in the bumblebee olfactory system. In this study, four types of sensilla were observed on the antennae of worker bees through a scanning electron microscope (SEM), which were mainly distributed with sensillum placodeum sensillum coeloconicum, sensillum trichodeum and sensillum cavity. The odorant receptor \u003cem\u003e816\u003c/em\u003e gene (\u003cem\u003eBiOr816\u003c/em\u003e) from \u003cem\u003eBombus ignites\u003c/em\u003e was cloned, and its expression profiles were examined during different developmental stages and tissues. The phylogenetic tree was divided into four branches: \u003cem\u003eMessor orientalis\u003c/em\u003e; \u003cem\u003eApis cerana ceran\u003c/em\u003e, \u003cem\u003eApis mellifera\u003c/em\u003e and \u003cem\u003eApis dorsat\u003c/em\u003e; \u003cem\u003eBombus lantschouensis\u003c/em\u003e, \u003cem\u003eBombus terrestris\u003c/em\u003e and \u003cem\u003eBombus ignites\u003c/em\u003e; and \u003cem\u003eDrosophila melanogaster\u003c/em\u003e. The cDNA sequence of \u003cem\u003eBiOr816\u003c/em\u003e was found to be highly similar to \u003cem\u003eBtOr22c\u003c/em\u003e (98.2%), which encoded a membrane-coupled protein of 385 amino acids. The \u003cem\u003eBiOr816\u003c/em\u003e protein belongs to the 7-transmembrane_6 receptor superfamily. Accordingly, the results of the quantitative real-time PCR (qRT-PCR) indicated that \u003cem\u003eBiOr816\u003c/em\u003e was expressed at high levels in worker bee antennae compared to its head, thorax, abdomen, legs and wings. This demonstrated that the antenna played a vital role in the process of olfactory recognition in bumblebees and served as its most important olfactory organ, which was consistent with the corresponding electron microscope photos showing many sensilla on the antennae.\u003c/p\u003e","manuscriptTitle":"Scanning electron microscopic observations of antennal sensilla, and the cloning and expression of the BiOr816 gene of Bombus ignites from China","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2020-07-20 18:15:19","doi":"10.21203/rs.3.rs-41451/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"820bfc0e-32dd-47cc-8b5b-47d35d159092","owner":[],"postedDate":"July 20th, 2020","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[{"id":179231,"name":"Population Genetics"},{"id":179232,"name":"Molecular Genetics"},{"id":179233,"name":"Medical Genetics"}],"tags":[],"updatedAt":"2020-08-27T17:16:36+00:00","versionOfRecord":[],"versionCreatedAt":"2020-07-20 18:15:19","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-41451","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-41451","identity":"rs-41451","version":["v1"]},"buildId":"-HB7Z8yhvgn0wM9Nzuekk","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}