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Inheritance and Linkage of Virulence Genes in Chinese Predominant Race CYR32 of the Wheat Stripe Rust Pathogen Puccinia striiformis f. sp. tritici

作者:   来源:   发布日期:2018-03-19  浏览次数:

论文信息: LongWang, Dan Zheng, ShuxiaZuo, Xianming Chen, Hua Zhuang, Lili Huang, Zhensheng Kang*, Jie Zhao*.Inheritance and Linkage of Virulence Genes in Chinese Predominant Race CYR32 of the Wheat Stripe Rust Pathogen Puccinia striiformis f. sp. tritici. Frontiers in Plant Science. Doi: 10.3389/fpls.2018.00120.

JCR 分区Q1,IF=4.298 

论文摘要:Puccinia striiformis f.sp. tritici (Pst) is the causal agent of stripe (yellow) rust on wheat. Itseriously threatens wheat production worldwide. The obligate biotrophic fungus is highlycapable of producing new virulent races that can overcome resistance. Studying theinheritance of Pstvirulence using the classical genetic approach was not possible untilthe recent discovery of its sexual stage on barberry plants. In the present study, 127progeny isolates were obtained by selfing a representative Chinese Yellow Rust (CYR)race, CYR32, on Berberis aggregate. The parental isolate and progeny isolates werecharacterized by testing them on 25 wheat lines with different Yr genes for resistanceand 10 simple sequence repeat (SSR) markers. The 127 progeny isolates were classifiedinto 27 virulence phenotypes (VPs), and 65 multi-locus genotypes (MLGs). All progenyisolates and the parental isolate were avirulent to Yr5, Yr8, Yr10, Yr15, Yr24, Yr26, Yr32,and YrTr1; but virulent to Yr1, Yr2, Yr3, Yr4, Yr25, Yr44, and Yr76. The VPs of the parentalisolate to nine Yr genes (Yr6, Yr7, Yr9, Yr17, Yr27, Yr28, Yr43, YrA, and YrExp2) and theavirulence phenotype to YrSPwere found to be heterozygous. Based on the segregationof the virulence/avirulence phenotypes, we found that the VPs to Yr7, Yr28, Yr43, andYrExp2 were controlled by a dominant gene; those to Yr6, Yr9, and YrA(Yr73, Yr74) bytwo dominant genes; those to Yr17 and Yr27 by one dominant and one recessive gene;and the avirulence phenotype to YrSPby two complementary dominant genes.Molecularmapping revealed the linkage of 10 virulence/avirulence genes. Comparison of theinheritance modes of the virulence/avirulence genes in this study with previous studiesindicated complex interactions between virulence genes in the pathogen and resistancegenes in wheat lines. The results are useful for understanding the plant-pathogeninteractions and developing wheat cultivars with effective and durable resistance.

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