摘要
以四个栽培棉种为材料，研究了草棉（Ｇｏｓｙｐｉｕｍｈｅｒｂａｃｅｕｍ）、亚洲棉（Ｇａｒｂｏｒｅｕｍ）、陆地棉（Ｇｈｉｒｓｕｔｕｍ）和海岛棉（Ｇｂａｂａｒｄｅｎｓｅ）的核型。各棉种的核型简式为：草棉，２ｎ＝２ｘ＝２６＝１８ｍ＋４ｓｍ＋４ｓｔ（４ＳＡＴ）；亚洲棉，２ｎ＝２ｘ＝２６＝２２ｍ＋２ｓｍ＋２ｓｔ（２ＳＡＴ）；陆地棉，２ｎ＝４ｘ＝５２＝２８ｍ＋２２ｓｍ（２ＳＡＴ）＋２ｓｔ（２ＳＡＴ）；海岛棉，２ｎ＝４ｘ＝５２＝２８ｍ＋２４ｓｍ（４ＳＡＴ）。通过对４个栽培棉种核型的对比分析，结果表明：草棉的核型比亚洲棉对称，属较原始的类型，陆地棉与海岛棉的核型很相似，唯在Ｓｍ染色体的数目和位置上有一定差异。研究还表明，在４个栽培种中，只有草棉具有ａ型随体，据此可鉴别种间杂种。
The karyotypes of four cultivated cotton species were studied and their karyograms were as follows: Gossypium herbaceum, 2n=2x=26=18m+4sm+4st(4SAT); G arboreum, 2n=2x=26=22m+2sm+2st(2SAT); G hirsutum,2n=4x=52=28m+22sm(2SAT)+2st(2SAT); G babardense, 2n=4x=52=28m+24sm(4SAT) By comparision of the karyotypes of four cultivated cotton species, it was shown that the karyotype of G herbaceum was more symmetrical than that of G arboreum,belonging to the relative primary type The karyotype of G hirsutum was similar to that of G babardense, except for some differences in the number and position of sm-chromosomes The results also indicated that only G herbaceum had type “a” SAT-chromosome among four cultivated cotton species, which could be used to identify interspecific hybrids Further more, some problems in karyotype analysis were discussed
出处
《浙江农业学报》
CSCD
1997年第3期135-139,共5页
Acta Agriculturae Zhejiangensis
关键词
棉花
草棉
亚洲棉
陆地棉
海岛棉
核型分析
Gossypium herbaceum
G arboreum
G hirsutum
G babardense
karyotype analysis
