宽叶韭居群间核型研究

对宽叶韭 1 0个居群的核型进行了研究 ,结果如下 :四川武隆居群 2 n=2 x=2 2 =1 6sm+6st;四川大飞水居群 2 n=2 x=2 2 =1 6sm +4st+2 t(2 SAT) ;四川南川居群 2 n=2 x=2 2 =2 m+1 4sm+4st+2 t;四川宝兴居群 2 n=2 x=2 2 =1 4sm+6st+2 t;四川青神居群 2 n=2 x=2 2 =2 m+6sm+1 0 st+4t;四川沐川居群 2 n=2 x=2 2 =2 m+1 4sm+2 st+4t;四川屏山居群 2 n=3 x=3 3 =3 m+2 1 sm+9st;云南西双版纳居群 2 n=2 x=2 2 =1 4sm+6st+2 t(2 SAT) ;广东乳源居群 2 n=3 x=3 3 =2 1 sm+6st+6t(3 SAT) ;广西龙胜居群 2 n=3 x=3 3 =2 1 sm+6st+6t(3 SAT)。研究表明 ,除四川屏山居群、广东乳源居群、广西龙胜居群是三倍体外 ,其余均为二倍体。它们都属于 Stebbins的 3 A型。此外 ,宽叶韭的不同居群间还存在随体染色体和核型组成的多态性。本文最后讨论了宽叶韭种内居群间核型分化的原因。

A karyotypic study on populations of Allium hookeri Thwaites

In the present paper, the karyotypes of ten populations of Allium hookeri Thwaites in Allium were studied. The results are as follows: Wulong population: 2n=2x=22=16sm+6st. Dafeishui population: 2n=2x=22=16sm+4st +2t(2SAT). Nanchuan population:2n=2x=22=2m+14sm+4st+2t. Baoxing population:2n=2x=22=14sm+6st+2t. Qingshen population:2n=2x=22=2m+6sm+10st+4t. Muchuan population:2n=2x=22=2m+14sm+2st+4t. Pingshan population:2n= 3x=33=3m+21sm+9st. Xishuangbanna population: 2n=2x=22=14sm+6st+2t(2SAT). Ruyuan population: 2n=3x=33= 21sm+6st+6t(3SAT).Longsheng population:2n=3x= 33=21sm+6st+6t(3SAT). The other was diploid except Pingshan population, Ruyuan population and Longsheng population were triploid. All the karyotypes belonged to Stebbins'3A type. In addition, there were polymorphism of satellite chromosome and polymorphism of chromosome type among populations of Allium hookeri Thwaites. Factors of intraspecific differentiation among the populations of Allium hookeri Thwaites were discussed.