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Pathogenicity and population structure analysis ofPyricularia oryzaein different districts of Jiangsu province, China

文献类型： 外文期刊

作者： Qi, Zhong-Qiang 1 ; Pan, Xiayan 1 ; Du, Yan 1 ; Shen, Lerong 1 ; Yu, Mi-Na 1 ; Cao, Hui-Juan 1 ; Song, Tian-Qiao 1 ; Yu, 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing 210014, Peoples R China

关键词： population structure; Pot-TIR; Pyricularia oryzae; resistance frequency

期刊名称：PLANT PATHOLOGY （ 影响因子：2.59； 五年影响因子：2.924 ）

ISSN： 0032-0862

年卷期：

页码：

收录情况： SCI

摘要： Rice blast caused byPyricularia oryzaeis one of the most destructive rice diseases worldwide. In this study, 224 isolates were isolated from neck blast samples from nine districts in Jiangsu. We analysed the resistance frequency of 24 resistance (R) genes using 32 monogenic rice lines from the International Rice Research Institute (IRRI), includingPii,Pik-h,Pi5,Piz-5, andPiz, which exhibit high resistance frequencies. PAC (pathogenicity association coefficients) and VAC (virulence association coefficients) analyses identified three combinations ofRgenes,Piz/Pii,Piz/Piz-5, andPiz/Pi5, as being suitable for use in Jiangsu. Mating-type analysis ofP.oryzaeisolates indicated that sexual reproduction occurred less frequently in northern Jiangsu than in other areas, which may affect genetic diversity and dissemination. Pot2-TIR analysis indicated that the genetic diversity ofP.oryzaein Xuzhou was mainly due to the insertion of transposable elements, while that of Nanjing was due to both the insertion of transposable elements and sexual recombination. Therefore, someRgenes or gene combinations were suitable for resistance breeding in Jiangsu, and repetitive-PCR (rep-PCR) is a cost-effective tool for genetically differentiating distinct cultivar-specific populations or lineages with well-defined virulence patterns, because of the close correspondence between rep-PCR based clusters and pathotypes of inbred lines.

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