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Karyotypes and evolution of five species of Leymus Hochst.
Author(s): 
Pages: 876-881,图版Ⅰ-Ⅱ
Year: Issue:  5
Journal: ACTA BOTANICA BOREALI-OCCIDENTALIA SINICA

Keyword:  赖草属核型进化;
Abstract: 报道了国产赖草属5个种的核型,即大赖草,2n=4x=28=24m(2SAT)+4sm(2SAT);粗穗赖草,2n=4x=28=22m(2SAT)+4sm+2st(2SAT);若羌赖草,2n=4x=28=20m(4SAT)+6sm+2st(2SAT);羊草,2n=4x=28=22m(4SAT)+2sm+4st(4SAT);窄颖赖草,2n=4x=28=22m(2SAT)+4 sm(2SAT)+2st(2SAT).同时,根据Stebbins的核型进化理论和分支系统学的编序赋值方法,对核型4个重要性状进行了分析,总结出了5个种的进化指数,并同外部形态演化分析相印证,揭示了宏观分类中3个组的系统发育水平.
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