2002年黑龙江省部分稻区稻瘟病菌生理小种鉴定

用中国7个统一鉴别品种对2002年在黑龙江省部分地区采集的57个单孢分离菌株进行了生理小种鉴定。共鉴定出6群10个生理小种,即ZA17、ZA49、ZB1、ZB19、ZB25、ZC9、ZD1、ZD5、ZE1和ZF1生理小种,其中ZD1为优势小种,出现频率为36.8%。生理小种的组成由1996年商世吉报导的4群7个生理小种发展到6群10个生理小种,优势小种也由ZE1转变为ZD1。其中ZA17、ZA49强致病型的生理小种开始出现。所鉴定出的10个生理小种对4个粳稻鉴别品种有较强的致病力。地域较近的地区稻瘟病菌的生理小种群体组成也有较大差异。

Identification of the physiological races of rice blast fungus in parts of Heilongjiang Province in 2002

Fifty-seven monoconidial isolates were obtained from rice blast specimens collected from parts of Heilongjiang Province in 2002. The isolates could be classified into six groups and ten physiological races, when they were assessed with seven Chinese differential rice eultivars, ZA17, ZA49, ZB1, ZB19, ZB25, ZC9, ZD1, ZD5, ZE1 and ZF1. The race ZD1 was the predominant one with a frequency of 36. 8%. The composition of physiological races has changed from four groups and seven physiological races in 1996 to now six groups and ten physiological races and the predominant race has also changed from ZE1 to ZD1. The strong pathogenic races ZA17 and ZA49 appeared. Ten physiological races were strongly pathogenic to the four differential rice cultivars of japonica rice. Physiological races in close areas were quite different.