Population Genetic Structure of the Rubber Tree Powdery Mildew Pathogen (Erysiphe quercicola) from China
文献类型： 外文期刊
作者： Cao, Xueren 1 ; Han, Qiaohui 1 ; Xiao, Ying 1 ; He, Junjun 6 ; Chuan, Xiangxian 7 ; Jiang, Guizhi 8 ; West, Jonathan S. 9 ; Xu, Xiangming 10 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Key Lab Integrated Pest Management Trop Crops, Hainan Key Lab Monitoring & Control Trop Agr Pests, Haikou 571101, Peoples R China
2.State Key Lab Breeding Base Green Pesticide & Agr, Guiyang 550025, Peoples R China
3.Minist Educ, Key Lab Green Pesticide & Agr Bioengn, Guiyang 550025, Peoples R China
4.Guizhou Univ, Guiyang 550025, Peoples R China
5.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China
6.Chinese Acad Trop Agr Sci, Zhanjiang Expt Stn, Zhanjiang 524031, Peoples R China
7.Dehong Trop Agr Res Inst Yunnan, Ruili 678600, Peoples R China
8.Yunnan Inst Trop Crops, Jinghong 666100, Peoples R China
9.Rothamsted Res, Harpenden AL5 2JQ, England
10.NIAB, East Malling ME19 6BJ, Kent, England
关键词： fungi; pathogen diversity; tropical plants
期刊名称：PLANT DISEASE （ 影响因子：4.5； 五年影响因子：5.0 ）
ISSN： 0191-2917
年卷期： 2024 年 108 卷 1 期
页码：
收录情况： SCI
摘要： 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 (R-xy = 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.
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