Virulence patterns of EU43 and “other” Phytophthora infestans lineages on potato clones with differential late blight resistance genes.

Virulence patterns of EU43 and “other” Phytophthora infestans lineages on potato clones with differential late blight resistance genes. | 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 Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed.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. 19 February 2026 V1 Latest version Share on Virulence patterns of EU43 and “other” Phytophthora infestans lineages on potato clones with differential late blight resistance genes. Authors : Bicko Steve Juma 0000-0002-7787-5759 , Olga Agata Oxholm , Jack Vossen , Kim [email protected] [email protected] , and Isaac Abuley Authors Info & Affiliations https://doi.org/10.22541/au.177148681.16106392/v1 104 views 46 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract The emergence and spread of the EU43 Phytophthora infestans clonal lineage, which is less sensitive to the fungicide mandipropamid, poses a new challenge for potato late blight management in Europe. Deploying host resistance from potato varieties is a promising and complementary strategy. However, the effectiveness of single late blight resistance genes ( Rpi genes) against EU43 and other prevalent clonal lineages remains unclear. In this study, we evaluated the resistance of 9 transgenic potato clones each carrying a single Rpi gene against a panel of 28 P. infestans isolates belonging to the EU43, EU41, EU39, EU13, EU36, and “other” P. infestans clonal lineages. We performed detached-leaf disc assays in the laboratory and whole-plant assays in the greenhouse to compare disease incidence and severity. Our results showed that several Rpi genes (notably Rpi-vnt1.1, Rpi-blb2 , and R9a ) conferred broad resistance against most of the tested isolates, including EU43, whereas most EU43 isolates overcame the R3a and Rpi-blb3 genes. Overall, EU43 did not exhibit significantly greater aggressiveness than other lineages on susceptible hosts. Some EU43 isolates demonstrated a broader virulence spectrum than the EU43 isolates, suggesting that virulence was acquired through mutation, driven by a selective advantage in hosts with the corresponding Rpi gene. However, some EU43 isolates showed a consistently higher virulence and aggressiveness than others. These findings underscore the importance of deploying effective Rpi genes, ideally in combination with other integrated pest management methods, for durable late blight control, especially in the face of fungicide-resistant pathogen populations Supplementary Material File (manuscript-bicko steve juma.docx) Download 7.74 MB Information & Authors Information Version history V1 Version 1 19 February 2026 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords phytophthora infestans rpi genes eu_43_a1 genetic variation genome host resistance Authors Affiliations Bicko Steve Juma 0000-0002-7787-5759 Aarhus Universitet Institut for Agrookologi Flakkebjerg View all articles by this author Olga Agata Oxholm Aarhus Universitet Institut for Agrookologi Flakkebjerg View all articles by this author Jack Vossen Wageningen University & Research Laboratorium voor Plantenveredeling View all articles by this author Kim [email protected] [email protected] Aarhus Universitet Institut for Agrookologi Flakkebjerg View all articles by this author Isaac Abuley Aarhus Universitet Institut for Agrookologi Flakkebjerg View all articles by this author Metrics & Citations Metrics Article Usage 104 views 46 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Bicko Steve Juma, Olga Agata Oxholm, Jack Vossen, et al. Virulence patterns of EU43 and “other” Phytophthora infestans lineages on potato clones with differential late blight resistance genes.. Authorea . 19 February 2026. DOI: https://doi.org/10.22541/au.177148681.16106392/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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