Gas Exchange Dynamics and Response Times in Olive Leaves under Controlled Light and Temperature over a 24-hour period

Gas Exchange Dynamics and Response Times in Olive Leaves under Controlled Light and Temperature over a 24-hour period | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 4 July 2025 V1 Latest version Share on Gas Exchange Dynamics and Response Times in Olive Leaves under Controlled Light and Temperature over a 24-hour period Authors : Sergio Aranda-Barranco 0000-0002-4089-5836 [email protected] , Eloy Navarro-Leon , Penélope Serrano-Ortiz , and Enrique P. Sánchez Cañete Authors Info & Affiliations https://doi.org/10.22541/au.175160539.92630587/v1 198 views 90 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Photosynthesis in plants is regulated by several factors, including light, temperature, and circadian rhythms. The photosynthetic response, in terms of net CO 2 assimilation (A n ), transpiration (E), stomatal conductance (g sw ), intrinsic water use efficiency (iWUE) or intercellular CO 2 concentration (C i ) has not been studied under controlled conditions throughout the day in olive groves and this can help improve the ecophysiological behavior of Mediterranean agricultural species. To better understand the gas exchange response to these environmental changes, A n , E, g sw , iWUE, and C i were measured over the course of the day in olive leaves using a portable infrared gas analyzer, first under ambient conditions, then while monitoring photosynthetically active radiation (PAR), and finally while monitoring air temperature (T air ) in the immediate environment of each leaf. In addition, high-frequency measurements allowed for the determination of the response times under controlled conditions. The results showed that A n , E, g sw , iWUE and C i remained stable during the 24-hour campaign when T air was maintained at 25ºC and PAR at 1500 µmol m -2 s -1 , including the night period. The decrease in T air around the leaf, compared to the ambient temperature, was the only factor limiting A n and g sw during the central hours of the day. The times to reach stabilization after night light induction were close to 20 min for A n and E, while iWUE tended to remain stable after 8 min. Nighttime leaf photosynthesis, when mimicking daytime conditions, is intricately influenced by temperature, circadian rhythms, and stomatal conductance. Since olive leaf photosynthesis remains uniform as long as PAR radiation, temperature, relative humidity, and CO 2 concentration are maintained, we conclude that gas exchange can be measured at any time of day, even at night, provided that the necessary stabilization periods are allowed. Supplementary Material File (2_aranda-barranco, s_2025__gas exchange dynamics.docx) Download 7.30 MB File (table.docx) Download 14.65 KB Information & Authors Information Version history V1 Version 1 04 July 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords gas exchange parameters irga mediterranean crops photosynthesis photosynthesis: carbon reactions transpiration Authors Affiliations Sergio Aranda-Barranco 0000-0002-4089-5836 [email protected] Universidad de Granada View all articles by this author Eloy Navarro-Leon Universidad de Granada View all articles by this author Penélope Serrano-Ortiz Universidad de Granada View all articles by this author Enrique P. Sánchez Cañete Universidad de Granada View all articles by this author Metrics & Citations Metrics Article Usage 198 views 90 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Sergio Aranda-Barranco, Eloy Navarro-Leon, Penélope Serrano-Ortiz, et al. Gas Exchange Dynamics and Response Times in Olive Leaves under Controlled Light and Temperature over a 24-hour period. Authorea . 04 July 2025. DOI: https://doi.org/10.22541/au.175160539.92630587/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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