ĐÁNH GIÁ ĐA DẠNG DI TRUYỀN TẬP ĐOÀN LÚA KHÁNG BẠC LÁ BẢN ĐỊA CỦA VIỆT NAM BẰNG CHỈ THỊ PHÂN TỬ SSR (Microsatellite)

The results using 21 SSR markers for analyzing genetic diversity of Vietnam bacterial blight resistance rice varieties have obtained a total number of 93 difference alleles (with a mean of 7.25 alleles per loci). PIC value changed from 0,1 to 0.9 (with a mean of 0.68). The rate of heterozygosity of Vietnam bacterial blight resistance rice varieties are very different in 21 SSR loci, the heterozygosity changed from 0 to 20%. Genetic similarity coefficients of 38 varieties were ranging from 0 to 0.78. Genetic similarity was determined using Jaccard’s similarity coefficients and final denderogram construction using a UPGMA clustering methods showed that 38 varieties were diveded into seven major groups, which shows great diversity among varieties: Group I consists of 05 varieties;bgroup II consists of 03 varieties; group III consists of 02 varieties; group V consists of 19 varieties; group VI consists of 07 varieties; group IV and VII have only one variety. Based on genetic clustering result, bacterial blight resistance phenotype and the origins of rice varieties, five varieties have been seleted as materials for further research on establishment of database for local bacterial blight resistance rice genetic resources in Vietnam.