Abstract:

SSR molecular markers were assayed to determine the population genetic diversity of 60 representative Phytophthora infestans isolates from China. The results showed that the genetic diversity index of Nei’s genetic diversity index,Shannon information index and the effective number of alleles（0.1528、0.2592、1.2170）of host plant tomato pathogenic Phytophthora species were higher than those (0.1395、0.2447、1.1913) of the host plant potato Phytophthora species,the results indicated the genetic diversity of host plant tomato Phytophthora species was higher than the host plant potato Phytophthora species.The results also showed there is not relationship between the genetic lineage and metalaxy sensitivity and Mating type, but there is relationship between the genetic lineage and mtDNA Haplotype.