云南省近年稻瘟病菌生理小种的组成和分布

Race composition and distribution of Magnaporthe grisea Cavara in Yunnan Province in recent years

用日本 9个水稻单基因鉴别品种和BL1、K5 9两个参考品种鉴定了云南省 4个稻作区 2 1个县 (市 )采集、分离的 15 5个稻瘟病菌单孢菌株 ,结果出现 78个稻瘟病菌生理小种 ,其中优势小种为 136 4(出现频率为 6 5 % )、317 4(出现频率 5 2 % )、0 0 7(出现频率 5 2 % )小种。通过研究各稻作区生理小种对日本鉴别品种的侵染率 ,分析了各垂直抗性基因在不同稻作区的利用价值。

It reports the result of 155 Magnaporthe grisea Cavara single cell races collected and isolated from 21 counties in 4 rice growing regions of Yunnan Province were identified using 9 single gene differential varieties and 2 reference varieties, “BL1” and “K59” from Japan during 1993-1997. It was divided 78 races, and the dominants were 136.4, 317.4, and 007. Meanwhile the races among four counties were compared and the availability of each vertical resistant gene was assessed by analysing infection frequency in different rice growing regions.