摘 要 ：本文报道了棉属 D 染色体组11个种的染色体数目和核型,并采用了核型对称系数、异质系数和重合率等新的计算方法进行了分析。根据核型同质程度,可将11个种分为6个亚组,即1—D_1、D_8和 D_6;2—D_(3-k)、D_(3-d);3—D_(2-1)、D_(2-2);4—D_4和 D_7;5—D_5;6—D_9。其中,D_6是 D 组的最原始种。根据核型比较分析,结合地理分布、
Abstract:The chromosome numbers and karyotypes of the 11 wild species of D genome inGossypium were reported in this paper.The karyotypes were analysed by the calculation of symmetry index(Si),heterogeneity index(Hi)and overlaping percentage(Op).According to the degrees of karyotypic homogeniety,the 11 specie