稻瘟病菌生理小种及其毒性  

Studies on physiological races and virulence of Magnaporthe grisea in Yunnan Province

作　　者：范静华[1] 周惠萍[1] 王洪海[1] 陈建斌[1] 陈海如[1] 

机构地区：[1]云南农业大学云南省植物病理重点实验室,云南昆明650201

出　　处：《植物保护》2005年第6期29-31,共3页Plant Protection

基　　金：国家"863"计划(Z16-03-M);云南省科技攻关项目(2001NG10)

摘　　要：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。测定结果为B9、B13、B15、B27、B29、B31、C9、C11、C15、D1、E3和G112个生理小种,其中粳型小种占60.29%,籼型小种占39.71%。此结果与以往云南省稻瘟病菌生理小种的变化趋势相吻合。供试的68个菌株进行毒性基因分析表明Av-Ks+和Av-i+频率毒性基因较高。A total of 68 single-spore 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-K^s ＋ 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.

关 键 词：植物病理学 稻瘟病菌 生理小种 毒性基因频率 

分 类 号：S435.111.41[农业科学—农业昆虫与害虫防治]