Analysis of Genetic Diversity of Early Maturing Upland Cotton Varieties in Northern Xinjiang

We analyzed genetic diversity of cotton in order to provide information for evaluation of germplasm resources and breeding in our local region.Thirty-eight pairs of SSR primers were used to analyze the genetic diversity of early maturing upland cotton varieties in northern Xinjiang.The genetic similarity(GS) coefficient,the category,and information on the genealogy of accessions were calculated using NTSYS-pc 2.11 software.We detected 126 bands among 33 varieties.The primers had 160 alleles,with a mean of 3.32;and the polymorphic information content(PIC) was around 0.1690 to 0.8503.The genetic similarity coefficient of 48 accessions ranged from 0.4120 to 0.9560.The germplasm resources of GS ranged from 0.57 to 0.61 and could be categorized into two major groups.The consanguinity of the first group including 17 varieties was Belshinuo;for the other group including 16 varieties,the main consanguinities were CCRI 17 and Xinluzao 16.The results of SSR markers were in accordance with the analysis of genetic diversity,indicating that the cotton varieties we tested possess little genetic diversity.