摘要
对分布于西藏地区的棘豆属和黄芪属７个种植物的核型进行了研究，其中除小叶棘豆外其余６个种的核型均为首次报道。结果如下：１．小叶棘豆Ｏｘｙｔｒｏｐｉｓｍｉｃｒｏｐｈｙｌｌｕｍ（Ｐａｌｌ．）ＤＣ．普兰材料的体细胞染色体数目为２ｎ＝１６，核型公式为２ｎ＝１６＋２ｂｓ＝８ｍ＋８ｓｍ＋２ｂｓ，核型不对称性属于２Ｂ型。拉孜的为２ｎ＝１６，核型公式为２ｎ＝１６＝８ｍ＋８ｓｍ，属于１Ａ型。２．冰川棘豆ＯｘｙｔｒｏｐｉｓｇｌａｃｉａｌｉｓＢｅｎｔｈ．ｅｘＢｇｅ．体细胞染色体数目为２ｎ＝１６，核型公式为２ｎ＝１６＋２ｂｓ＝１０ｍ＋６ｓｍ（２ＳＡＴ）＋２ｂｓ，属于２Ａ型。第４对染色体具随体。３．毛瓣棘豆ＯｘｙｔｒｏｐｉｓｓｅｒｉｃｏｐｅｔａｌａＣ．Ｅ．Ｃ．Ｆｒｉｓｃｈ体细胞染色体数目为２ｎ＝１６，核型公式为２ｎ＝１６＝１０ｍ＋６ｓｍ，属于２Ａ型。４．胀果棘豆ＯｘｙｔｒｏｐｉｓｓｔｒａｃｈｅｙａｎａＢｅｎｔｈ．体细胞染色体数目为２ｎ＝４８。５．劲直黄芪ＡｓｔｒａｇａｌｕｓｓｔｒｉｃｔｕｓＧｒａｈ．ｅｘＢｅｎｔｈ．体细胞染色体数目为２ｎ＝３２，核型公式为２ｎ＝３２＝２０ｍ＋１２ｓｍ，属于２Ａ型。６．长爪黄芪Ａｓｔｒａｇａｌｕｓｈｅｎｄ?
The plants of genera Oxytropis and Astragalus which belonged to the family Paplionaceae are commonly distributed in dry land or high mountain region. There were similiar morphological characters,and their geographic distributions overlapped.In the present paper,the karyotypes of seven species were investigated in two genera. Their karyotype formulas and karyotype asymmetry following Stebbins's classification, were shown as follows:1.Oxytropis microphyllum(Pall,)DC:(1) 2n=16+2bs=8m+8sm+2bs, belonged to 2B type,which was from Pulan. (2)2n=16=8m+8sm, belonged to 1A type, which was from Lazi.2.Oxyiropis glacilais Benth. ex Bge:2n = 16+2bs= 10m+6sm(2SAT)+2bs,2A type,which was camed with a satellite in the 4th pari of chromosomes.3.Oxytropls sericopetala C. E. C.Friseh:2n=16=10m+6sm,2A type.4.Oxytropis stracheyana Benth:2n=48.5.Astragalus strictus Grah. ex Benth:2n=32=20m+12sm,2A type.6.Astrasalus hendersonii Baker:2n=16=2m+10sm (2SAT)+4st,3A type,which Was carried with a satellite in the 5th pari of chromosomes.7.Astragalus oplites Benth.ex Parkers:2n=16=8m+8sm. 1A type, in which the karyotypes of seven species studied were investigated for the frist time except that the chromosome numbers of O. microphyllum had ever been reported Basic chromosome number in the two genera were x=8.
出处
《云南植物研究》
CSCD
1994年第1期53-59,共7页
Acta Botanica Yunnanica
