广东省稻瘟病菌生理小种的消长动态

Race dynamics of Magnaporthe grisea in Guangdong Province during 1990-1997 .

１９９０～１９９７年，用中国稻瘟病菌鉴别寄主鉴定了广东省稻瘟病菌单孢菌株１５７４份，共鉴定出８群４３个生理小种。其中ＺＣ群一直是广东省的优势种群，其出现频率平均为５０２％；ＺＣ１３一直是优势小种，其出现频率平均为２７４％，其次是ＺＧ１（１８８％）、ＺＣ１５（１４５％）和ＺＢ１３（９１％）小种。不同地区不同年份优势小种的类型及其组成不同。

isolates of rice blast fungus, Magnaporthe grisea, were collected in Guangdong Province, and of them 8 groups with 43 races were identified using differential rice varieties during 1990-1997. The results showed that ZC group of them was the dominant group with the average frequence of 50.2%, and race ZC13 was the dominant race with the average frequency of 27.4%. The average frequency of races ZG1, ZC15 and ZB13 were 18.8%, 14.5% and 9.1%, respectively. Types and compositions of the races were different from time to time and place to place.