Biotechnology Bulletin ›› 2018, Vol. 34 ›› Issue (7): 138-146.doi: 10.13560/j.cnki.biotech.bull.1985.2017-1070

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Purity Identification and Genetic Diversity Analysis of Cotton Germplasm Resources Using SSR Markers

SHI Jian-bin, ZHOU Hong, WANG Ning, XU Qing-hua, QIAO Wen-qing, YAN Gen-tu   

  1. Institute of Cotton Research of Chinese Academy of Agricultural Sciences,State Key Laboratory of Cotton Biology,Anyang 455000
  • Received:2017-09-27 Online:2018-07-26 Published:2018-08-01

Abstract: The purity and genetic diversity of 58 cotton germplasm resources were analyzed with 26 core SSR polymorphic markers screened in previous studies. The results showed that the purity of different materials was between 20%-90%,and the detection result of molecular marker was conformity with the phenotype in field,indicating that the accuracy of SSR detection was high and it can be used as a method for rapid detecting the purity of cotton germplasm. A total of 85 polymorphic genotypes were obtained,and the number of genotypes detected by each marker was between 2 and 5,with an average of 3.27. The primer polymorphism information content was between 0.073 7-0.928 1,with an average of 0.363 9. NTSYS-pc2.10 software was used to analyze the genetic diversity of 58 cotton germplasm resources,the results showed that the genetic similarity coefficient ranged from 0.305 1 to 0.898 3,the amplitude of variation was 0.593 2. The 58 materials can be divided into 5 major categories based on 0.63 GS level,and the variety resources of DNA clustering showed no correlation with their geographic ecological source,but a high correlation with genetic relationships of the materials. The clustering result can more truly reflect the genetic differences between the varieties.

Key words: cotton, germplasm resources, identification of purity, genetic diversity, clustering analysis