Abstract:

To understand the distribution and variation of Phytophthora infestans in northeast China, SSR genotypes of 373 P. infestans strains collected from Hebei, Heilongjiang, Liaoning and Jilin Provinces in 2008—2010 were analyzed using the SSR primers Pi4B and Pi4G. A total of 16 kinds of SSR genotypes were identified: A-03, A-09, B-01, D-03, F-01, F-04, F-05, F-06, F-07, F-08, G-02, G-03, I-01, J-01, K-01 and L-01. Among them, the dominant genotype was F-01, accounting for 67.83% in the measured strains, followed by the F-06 genotype (14.75%). The numbers of SSR genotypes in Hebei, Heilongjiang, Liaoning and Jilin were 11, 8, 4 and 3, respectively. 7 kinds of SSR genotypes, including A-09, F-07, F-08, I-01, J-01, K-01 and L-01 were the first reported in the Northeast and the Hebei Region in China. During 2008—2010, the numbers of P. infestans SSR genotype were increased significantly in Hebei and Heilongjiang Province, and changed slightly in Liaoning and Jilin. It was clear that dominant SSR genotype of P. infestans in northeast of China and Hebei Province was single and high ratio could provide the basis for making comprehensive protection strategy in potato production, especially for the rational distribution of potato varieties.