Population structure, pathogenicity, and fungicide sensitivity of Colletotrichum siamense from different hosts in Hainan, China

A - Papers appearing in refereed journals

Cao, X., Zhu, Z., Che, H., West, J. S., Lin, Y., Luo, D. and Xu, X. 2021. Population structure, pathogenicity, and fungicide sensitivity of Colletotrichum siamense from different hosts in Hainan, China. Plant Pathology. 70 (5), pp. 1158-1167. https://doi.org/10.1111/ppa.13361

AuthorsCao, X., Zhu, Z., Che, H., West, J. S., Lin, Y., Luo, D. and Xu, X.
Abstract

Areca palm, rubber tree, and coffee are always planted adjacent to each other or intercropped with each other, and Colletotrichum siamense was found to be the dominant species of Colletotrichum from these crops in Hainan, China. To study the population structure, pathogenicity, and fungicide sensitivity of C. siamense from these three crops in Hainan, isolates were first identified by their morphological characteristics and multilocus phylogeny. Then both permutational multivariate analysis of variance (PERMANOVA) and pairwise FST analysis showed that the original host and geographical origin (counties) had significant effects on genetic variation in the C. siamense population, explaining 5.6% and 16.3% of genetic variation, respectively. There were significant genetic differentiations between coffee and rubber tree populations but the genetic differentiation was small (FST = 0.04), while significant differentiations were observed among all populations from different counties except those between Haikou and Chengmai. Pathogenicity analysis using artificial inoculation showed that isolates had significantly higher disease incidence and diseased lesion diameter on wounded leaves than on nonwounded leaves. However, the original host of an isolate and geographical origin did not significantly affect the pathogenicity of the C. siamense populations from these three hosts. In vitro tests showed that there were no significant differences in the sensitivity of C. siamense populations to carbendazim, prochloraz, difenoconazole, and propiconazole from different original hosts and geographical origins. The present study suggests that host specialization of C. siamense has not occurred yet in coffee, rubber tree, and areca palm.

KeywordsColletotrichum siamense; Fungicide sensitivity; Pathogenicity; Population structure
Year of Publication2021
JournalPlant Pathology
Journal citation70 (5), pp. 1158-1167
Digital Object Identifier (DOI)https://doi.org/10.1111/ppa.13361
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
National Natural Science Foundation of China
Output statusPublished
Publication dates
Online14 Mar 2021
Publication process dates
Accepted04 Feb 2021
PublisherWiley
ISSN0032-0862

Permalink - https://repository.rothamsted.ac.uk/item/98459/population-structure-pathogenicity-and-fungicide-sensitivity-of-colletotrichum-siamense-from-different-hosts-in-hainan-china

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