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鹅观草属五个类群的核型与进化
蔡联炳; 冯海生;   
中国科学院西北高原生物研究所
摘要:
报道了鹅观草属5个类群的核型,即长芒鹅观草,核型2n=4x=28=22m+6sm(2SAT);短颖鹅观草,核型2n=4x=28=20m(2SAT)+8sm(2SAT);短柄鹅观草,核型2n=4x=28=22m(2SAT)+6sm;纤毛鹅观草,核型2n=4x=28=20m+8sm(4SAT);毛盘鹅观草,核型2n=4x=28=18m+6sm(4SAT)+4st。同时,通过核型重要性状的递变分析,揭示了鹅观草属5个类群的相对进化程度以及宏观分类中4个组的系统发育关系,表明鹅观草属的半颖组在系统发育中可能既派生了颖体短小的小颖组,又派生了颖体长大的大颖组和长颖组。
关键词:  鹅观草属  核型  进化  
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