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1976年—1990年,从广西83个县、市采集穗颈瘟标样,获得有效菌株2065个,用中国7个鉴别品种和广西3个补助鉴别品种鉴别出病菌小种7群58个小种;同一小种不同菌株间对品种致病力有差异。15年的试验表明,广西有3次水稻品种布局的大变化导致稻瘟病菌小种类型组成的大改变;而劣势小种的大量增殖,使抗病品种丧失抗性,不得不改种其他品种,体现病菌小种类型的消长制约着水稻品种的布局。
From 1976 to 1990, panicle blast samples were collected from 83 counties and cities in Guangxi province, and 2065 effective strains were obtained. Seven species (58 minor species) of pathogenic races were identified using 7 differential cultivars from China and 3 differential identification cultivars from Guangxi. ; The same species of different strains of different strains of virulence differences. Fifteen years of experiments showed that three major changes in the rice variety layout in Guangxi led to major changes in the racial species composition of M. grisea. However, the proliferation of inferior races led to the loss of resistance of resistant varieties and the need to switch to other varieties , Reflecting the growth and decline of germ races restricts the layout of rice varieties.