摘要： 早熟棉遗传多样性研究是早熟棉遗传改良的基础,对培育早熟棉新品种有重要意义.为了进一步改善现有早熟棉品种的早熟性,为早熟棉育种的亲本组配提供依据,利用35对SSR分子标记,对来自不同地区的83份早熟抗虫棉种质进行遗传多样性分析.结果表明,筛选出的22对多态性引物共扩增出30条多态性条带.NTSYS-pc2.11的遗传多样性分析表明,83份材料的相似系数变化为0.73~0.98,当遗传相似系数为0.73时,将83份棉花早熟材料分为两大类.第Ⅰ类群包含59个材料,第Ⅱ类群包含24个材料.表明我国早熟棉遗传基础比较狭窄,今后育种中要选用亲缘关系较远的材料作为杂交亲本,创制新的早熟棉种质资源.

关键词: 早熟棉, 种质资源, SSR标记, 遗传多样性

Abstract: It is very important to study the genetic diversity of early-maturing cotton for breeding early-maturing cultivar.To improve the prematurity of early-maturing cotton and select right parent combinations,we analysed the genetic diversity of 83 early-maturing cotton germplasms from different ecotypes in China using 35 pairs of SSR primer.As a result,we got 22 pairs of polymorphic primer and 30 allelic variations.The result of NTSYS-pc2.11 analysis indicated that genetic similarity coefficient of the 83 germplasms ranged from 0.73 to 0.98,which showed that there was limited genetic diversity in early-maturing cotton germplasms.The 83 early-maturing cotton germplasms were divided into 2 groups with the genetic similarity coefficient at 0.73,which included 59 and 24 members respectively.We should select parent combinations with distant phylogenetic relationships for early-maturing cotton breeding in future work.

Key words: Early-maturing cotton, Germplasms, SSR marker, Genetic diversity

中图分类号: 

• S562