SSR-Based Analysis on Genetic Diversity of Rice Landraces from Guizhou Province,China

The genetic diversity of 74 rice landraces from Guizhou Province, China was analyzed with 21 SSR markers and six standard varieties representing typical indica and japonica ecotypes. Ninety-two alleles were detected. The average number of alleles per locus was 4.381 with a range from 2 to 9. The Shannon′s information indices varied widely from 0.2793 to 1.8732 with an average value of 0.935. The expected heterozygosities ranged from 0.0988 to 0.8313 with an avesage value of 0.5145. Cluster analysis results showed that the similarity coefficients varied from 0.64 and 0.98 and UPGMA cluster analysis showed that the rice materials tested could be divided into four groups at a genetic similarity coefficient of 0.682. Most of the materials were scattered around typical japonica ecotypes and the genetic relationship among these landraces was not in accord with their geographical origins. The results of principal coordinates analysis and UPGMA cluster analysis revealed that the genetic structure was multiplex in the rice landraces. The rice landraces from Guizhou Province showed lower genetic diversity and most were japonica ecotypes according to SSR analysis.