Population Genetic Structure of the Rubber Tree Powdery Mildew Pathogen (Erysiphe quercicola) from China

A - Papers appearing in refereed journals

Cao, X., Han, Q., Xiao, Y., He, J., Chuan, X., Jiang, G., West, J. S. and Xu, X. 2024. Population Genetic Structure of the Rubber Tree Powdery Mildew Pathogen (Erysiphe quercicola) from China. Plant Disease. https://doi.org/10.1094/PDIS-03-23-0575-RE

AuthorsCao, X., Han, Q., Xiao, Y., He, J., Chuan, X., Jiang, G., West, J. S. and Xu, X.
Abstract

In order to manage agricultural pathogens, it is crucial to understand the population structure underlying epidemics. Rubber tree powdery mildew, caused by Erysiphe quercicola, is a serious threat to rubber plantations worldwide, especially in subtropical environments including all rubber tree-growing regions in China. However, the population structure of the pathogen is uncertain. In this study, 16 polymorphic microsatellite markers were used to genotype powdery mildew samples from the main rubber tree-growing regions including Yunnan (YN), Hainan (HN), western Guangdong (WG), and eastern Guangdong (EG). YN had higher genotypic diversity (Simpson’s indices), genotypic evenness, Nei’s gene diversity, allelic richness, and private allelic richness than the other regions. Cluster analysis, discriminant analysis of principal components, pairwise divergence, and shared multilocus genotype analyses all showed that YN differed significantly from the other regions. The genetic differentiation was small among the other three regions (HN, WG, and EG). Analysis of molecular variance indicated that the variability among regions accounted for 22.37% of the total variability. Genetic differentiation was significantly positively correlated (Rxy = 0.772, P = 0.001) with geographic distance. Linkage equilibrium analysis suggested possible occurrence of sexual recombination although asexual reproduction predominates in E. quercicola. The results suggested that although significant genetic differentiation of E. quercicola occurred between YN and the other regions, pathogen populations from the other three regions lacked genetic differentiation.

KeywordsFungi; Pathogen diverity; Tropical plants
Year of Publication2024
JournalPlant Disease
Digital Object Identifier (DOI)https://doi.org/10.1094/PDIS-03-23-0575-RE
Open accessPublished as non-open access
FunderNational Natural Science Foundation of China
Output statusPublished
Publication dates
Online02 Jan 2024
Publication process dates
Accepted14 Jul 2023
ISSN0191-2917
PublisherAmerican Phytopathological Society (APS)

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