五个澳洲野生棉种的核型研究

对斯特提棉（Ｇ．ｓｔｕｒｔｉａｎｕｍ）、南岱华棉（Ｇ．ｎａｎｄｅｗａｒｅｎｓｅ）、澳洲棉（Ｇ．ａｕｓｔｒａｌｅ）、纳尔逊氏棉（Ｇ．ｎｅｌｓｏｎｉ）和比克氏棉（Ｇ．ｂｉｃｋｉ）五个澳洲野生棉种的染色体核型进行了分析研究。结果表明，五个澳洲野生棉种的核型比较相似，均有两对随体染色体，种间的核型重合率均大于８５％，其中斯特提棉与南岱华棉、澳洲棉与纳尔逊氏棉，及其比克氏棉与澳洲棉或纳尔逊氏棉之间的核型重合率大于９０％。此外，本文对比克氏棉的系统发育和染色体组划分等问题进行了讨论。

Studies on the Karyotypes of the 5 Wild Species of Gossypium in Australia

The karyotypes were analyzed by the calculation of the symmetry index and overlapping percentage among the 5 wild species of Gossypium in Australia , G.sturtianum, G.nandewarense , G.australe, G.nelsonii and G.bickii and the results showed that the karyotypes of the 5 Australian wild species were very similar and all the 5 species had two pair of satellites which located in different number of chromosomes. The overlapping percentage of karyotypes among the 5 species were larger than 85%, and those between G.sturtianum and G.nandewarense, as well as those among G.australe, G.nelsonii and G.bickii were larger than 90%. In addition, the systematic development and genome classification of the G.bickii were discussed in this paper.