Genetic Diversity of 89 Japonica Rice Varieties in Ningxia Province by Using SSR

The 89 Japonica rice varieties of Ningxia Province,were analyzed by using a set of 47 SSR molecular markers located on 12 chromosomes of rice to estimate their genetic diversity for the purpose of conservation.The results indicated that:(1)a total of 750 alleles were detected at 47 SSR loci and the number of alleles per marker ranged from two to nine with an average of 4.16;(2)Clustering analysis with UPGMA method based on genetic similarity coefficients showed that the similarity coefficients varying between 0.63 and 0.91,with a average of 0.79.The 89 rice accessions could be classed into eight distinct classes at similarity coefficient 0.718.The results showed that rice varieties of Ningxia had higher similarity and genetic background was vulnerable among these resources.