水稻遗传多样性田间稻瘟病菌生理小种研究

Study on constitution of physiological race of Magnaporthe grisea in rice mixture field

采用 7个中国稻瘟病菌鉴别品种 ,将来自 2 0 0 0年云南省石屏县水稻品种净栽和混栽田块的 62个稻瘟病菌株鉴定为 7群 1 5个小种。其中 ,来自净栽黄壳糯田块的 1 0个菌株被鉴定为 4个种群 ,来自净栽汕优 63田块的 2 8个菌株鉴定为 3个种群 ,来自汕优 63 /黄壳糯混栽田块的 2 4个菌株鉴定为 6个种群。本实验结果表明 ,混栽田块稻瘟病菌生理小种类型比净栽田块丰富 。

The virulence of 62 monoconidial cultures of rice blast fungus isolated from mixture/mono culture rice fields in Shiping County was tested with a standard set of 7 differential rice varieties commonly used in China. The results of pathogenicity testing showed there were 4 race groups in glutinous monoculture field, 3 race groups in hybrid monoculture field and 6 race groups in mixture field. From what mentioned above, the results demonstrated that there were more abundant race groups in mixture field than in monoculture one, it proved that rice variety diversity contributed to stabilization selection of Magnaporthe grisea .