Genetic diversity of soybean genotypes different in powdery mildew resistance using SSR markers

Powdery mildew disease, one of the major diseases of soybean in Vietnam was caused by Microsphaera diffusa. SSR (Simple sequence repeats) marker, because of their co-dominance, polymorphic and stability have been wildely used to measure genetic diversity in crop. In the present study, genetic basis of 36 soybean genotypes varying in powdery mildew resistance was studied using 14 SSR markers. A total of 61 alleles with an average of 4,36 allele/locus, which indicated hight genetic diversity of the studied genotypes. PIC value of each marker ranged from 0 (Sat_396, Satt183, Sat_298) to 0,711 (Sat_224) with an average of 0.364 which shown high genetic diverrsity among the studied genotypes. At genetic similarity coefficient of 0.75, 36 soybean genotypes divided into 8 distint groups. Group 1 and group 2 included 21/25 genotypes which was resistant to powdery mildew. Groups 1, 2, 4, 5 and 8 include powdery mildew resistance genotypes.