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用7 个全国统一鉴别品种对1980～1996 年采集的江苏省稻瘟病标样的1 032个单孢菌株进行小种鉴定, 分析了江苏省稻瘟病菌小种演变的原因及与水稻品种的关系。结果表明, 江苏省曾先后出现过8 群22 个小种, 除1990年ZA小种群、1991 年ZD、ZE小种群上升为优势种群外, ZG1 小种一直是江苏省的优势小种, 出现频率达66.20% , 为江苏省稳定小种。江苏省各稻区小种组成有一定差异。水稻栽培品种是决定小种种群结构的主要因素之一, 江苏省大部分品种与ZG1小种有亲和性, 只有少数品种能被ZA、ZB、ZC、ZD和ZE群小种侵染, 可能是ZG1 小种在江苏省稻区成为优势小种的主要原因之一。从江苏省大部分主栽品种上能分离到2 个以上小种且不同品种上其小种的组成有一定差异,构成了田间小种结构的复杂性。
A total of 1 032 monosomyces strains of rice blast isolates collected from 1980 to 1996 in Jiangsu Province were identified by using 7 uniform national identification cultivars. The reasons for the evolution of races of Magnaportacum scleropha in Jiangsu Province and its relationship with rice cultivars were analyzed . The results showed that there were 8 minor groups of 22 races in Jiangsu Province. Except for 1990 ZA small population, ZD1 and ZE small population increased to dominant species in 1991, ZG1 races have been the dominant races in Jiangsu Province, the frequency of occurrence Up to 66.20%, for the stable varieties in Jiangsu Province. The races in Jiangsu Province have some differences in races. Rice cultivars are one of the main factors that determine the structure of races. Most of Jiangsu cultivars have affinity with ZG1 races. Only a few cultivars can be invaded by ZA, ZB, ZC, ZD and ZE races. It is one of the main reasons why ZG1 races have become the dominant races in the rice area of Jiangsu Province. More than two races can be isolated from most of the main cultivars in Jiangsu Province, and their races have some differences in the composition of the races, which make up the complexity of races in the field.