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1997 年对四川省东南部稻瘟病菌230 个有效单孢菌株测定结果表明, 病菌生理小种由4 群17 个小种组成, 以28 群小种为优势种群, 出现频率为70.2% 。不同生态区及不同水稻品种间病菌生理小种组成有明显差异。同一水稻品种叶瘟和穗颈瘟生理小种组成也有显著差异, 穗颈瘟生理小种组成比叶瘟复杂, 致病力比叶瘟强。同一水稻品种不同叶片、不同病穗乃至同一叶片不同病斑间都可测出不同生理小种。
In 1997, the results of 230 effective spore-forming isolates of Magnaporthe grisea in southeastern Sichuan Province showed that the pathogen was composed of 4 groups and 17 races, and 28 races were the dominant species with frequency of 70.2%. There were significant differences in the composition of pathogenic races in different ecological zones and different rice varieties. The composition of leaf races and panicle neck blast races in the same rice varieties also showed significant differences. The composition of panicle races was more complicated than that of leaf blast, and the pathogenicity was stronger than that of leaf blast. Different physiological races can be detected in different leaves of the same rice variety, different diseased ear and even the same lesion.