Studies on physiological races and virulence of _Magnaporthe grisea in Yunnan Province
2005
Fan Jinghua, Zhou Huiping, Wang Honghai
chinois. 用我国一套稻瘟病菌生理小种鉴别品种对分离自云南省红河州个旧、石屏、建水不同种植模式的68个稻瘟病菌单孢菌株进行生理小种测定，同时以日本8个单基因鉴别品种对供试菌株进行基因分析。
Afficher plus [+] Moins [-]anglais. A total of 68 singlespore isolates of Magnaporthe grisea,collected from the rice mixture or monoculture in Gejiu, Shiping, and Jianshui County of Yunnan Province, were inoculated and analyzed based on 7 Chinese identification varieties. The results showed that the 68 single_spore isolates could be classified into 12 physiological races. The frequency of Japonica race and Indica race were 60.29% and 39.71%, respectively. The frequency of Japonica race increased. The development tendency of the races was similar to that in the past in Yunnan Province. Meanwhile, the frequency of the virulence genes of the 68 single-spore isolates was tested using 8 Japanese single-gene identification varieties. The frequency of the virulence gene _AV-Ks+and _AV-i+_ were the highest, which were 82.81%and 79.69%, respectively. The results may provide scientific basis for resistance breeding and variety disposition.
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