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Genetic diversity among populations as related to pathotypes for Magnaporthe grisea in Hunan province

Genetic diversity among populations as related to pathotypes for Magnaporthe grisea in Hunan province

Zhongguo Shuidao Kexue 21(3): 304-308

The genetic diversity of 230 monoconidial isolates of Magna porthe grisea was analyzed using eight pairs of SSR markers. All isolates tested were classified into seven genetic lineages at 0.23 level of the genetic dissimilarity through the clustering analysis of UPGMA. The lineages I, V, VI were the predominant ones with the rates of 23.9, 23.5, 23.0% respectively. Only one isolate fell into the lineage IV and five isolates belonged to the lineage VII. As 77 isolates selected from above monoconidial isolates were characterized with seven Chinese differential varieties, they were distributed to the 7 groups (ZA, ZB, ZC, ZD, ZE, ZF ZG) and 30 pathotypes. There was great differentiation among ZA. ZB and ZC groups. ZG(1) was the predominant race, and its frequency in the total blast fungus population was as high as 26.5%. Compared with the results of SSR analysis and pathotypes, there wasn't obviously corresponding relationship between genetic lineages and pathotypes.

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