黄芪属六种植物的核型多样性

采用常规压片法,对豆科黄芪属6种植物制备染色体标本进行核型分析。结果表明:体细胞中期染色体数目分别为:沙打旺、斜茎黄芪、达乌里黄芪2n=16,均为二倍体;草木樨状黄芪2n=32,为四倍体;紫云英、鹰嘴紫云英则呈现多数目性,紫云英染色体数变动范围为55～65,64条稍多,鹰嘴紫云英染色体数变动范围51～65,62条稍多,均为混倍体。核型公式分别为:沙打旺2n=2x=16=12m+4sm;斜茎黄芪2n=2x=16=10m+6sm;达乌里黄芪2n=2x=16=16m;草木樨状黄芪2n=4x=32=32m;紫云英2n=64=62m+2sm;鹰嘴紫云英2n=62=12M+50m(2SAT)。染色体核型呈现多样性。

Karyotype diversity of six Astragalus species

Karyotypes were studied by conventional pressed slice method in 6species in Astragalus.The results showed that the metaphase chromosome numbers were 2n=16for A.huangheensis 、 A.adsurgens and A.dahuricus , 2n=32for A.melilotoides , from 55to 65for A.sinicus ( 64was preponderant ), from 51to 65for A.cicer ( 62was pre-ponderant ) .The somatic chromosome numbers showed diversity among species.The karyotypes were formulated to be 2n=2x=16=12m+4sm for A.huangheensis , 2n=2x=16=10m+6sm for A.adsurgens , 2n=2x=16=16mfor A.dahuricus , 2n=4x=32=32mfor A.melilotoides , 2n=64=62m+2sm for A.sinicus , 2n=62=12M+50m ( 2SAT ) for A.cicer.The karyotype was diverse among species.