Pathotypes of Pyricularia grisea in Rice Fields of Central and Southern China

H. L. Chen, B. T. Chen, D. P. Zhang, Y. F. Xie, Qifa Zhang
Plant Disease, 2001, 85(8): 843-850  DOI: 10.1094/PDIS.2001.85.8.843     追溯原文......本站官方QQ群:62473826

Blast, caused by the fungal pathogen Pyricularia grisea, is the most devastating disease of rice worldwide. Knowledge of the pathotype composition of the pathogen in rice fields is essential for rational deployment of resistance genes in rice breeding programs. In this study, we assayed the pathotypes of the pathogen populations using samples recently collected from 13 major rice-growing provinces of central and southern China. In all, 792 single spore isolates were tested for pathogenicity reactions using 13 host differentials consisting of six indica and seven japonica near-isogenic lines (NILs). The compositions of the pathogen populations were complex; 48 pathotypes were identified with the indica NILs, 82 pathotypes were detected with the japonica NILs, and a total of 344 pathotypes were identified with both indica and japonica NILs. There were large differences in distribution of the pathotypes among the different rice-growing areas. Even neighbor provinces seemed to differ sharply in types and frequencies of the most prevalent pathotypes. There was also a large difference in the frequencies of the isolates producing compatible reactions on the NILs, indicating the difference in frequencies of avirulence genes in the pathogen populations. The data provided very useful information for formulating strategies for improving blast resistance in rice breeding programs.

稻瘟病菌在华中和华南稻区的致病表型

由稻瘟病菌引起的水稻稻瘟病是全球范围内影响水稻生产最具破坏性的疾病。了解稻瘟病病原体的致病型组成能协助在水稻抗病育种过程中加入对应的抗性基因。本研究中,我们近期从中国中部和南部的13个主要水稻种植省份收集了样本,并对病原种群的致病型进行分析。总共792单孢菌株进行了测试,使用13个鉴定寄主包括6个籼稻和7个粳稻近等基因系进行致病型反应。发现病原种群的组成十分复杂; 籼稻近等基因系鉴定出48个稻瘟病菌致病型,粳稻近等基因系中检测到82个致病类型,籼稻和粳稻近等基因系共鉴定出344个致病型。不同稻区的稻瘟病菌致病型的分布差异很大,甚至相邻省份的稻瘟病菌的类型和最常见致病型的发生频率也明显不同。同时,近等基因系上出现兼容反应的菌株的频率的不同,表明病原群体中无毒基因的出现频率存在差异。这些数据为抗稻瘟病水稻品种的培育提供了非常有用的信息。


基因列表
  稻瘟病抗性基因 Pi9; Pi2/Piz-5; Pi50; Piz; Pi