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作 者 ：翟艳红;杨莹;星耀武;纪运恒;周浙昆

期 刊 ：植物科学学报 2011年 29卷 1期 页码：50-57

关键词：多星韭；葱科；核型；同源四倍体；

Keywords:Allium wallichii, Alliaceae, Karyotype, Autotetraploid,

摘 要 ：采用染色体压片技术对云贵高原17个多星韭居群,共412株个体进行染色体数目和核型研究。结合已有的细胞学资料,对云贵高原多星韭多倍体分布格局进行了研究。9个二倍体居群、6个二倍体与四倍体混生居群分布于云南中部至西北部,12个四倍体居群分布于整个云贵高原。二倍体除香格里拉d和保山居群核型类型为3A型外,其余均为2A型,四倍体除会泽和赫章居群为2 B型外,其余均为2A型。云南西北部四倍体核型不对称指数低于其它分布区,推测该地区四倍体可能起源较早。多星韭二倍体与四倍体核型类型和形态并无明显差异,表明多星韭四倍体可能为同源多倍体。

Abstract:Chromosome numbers and karyotypes of seventeen populations of Allium wallichii(Alliaceae) from the Yunnan-Guizhou Plateau were examined.The polyploidy distribution pattern of this species was analyzed based on 412 newly studied plants from seventeen populations and published data.Nine diploid populations and six diploid-tetraploid mixed populations occur in central to northwest Yunnan,while twelve tetraploid populations occur in the Yunnan-Guizhou Plateau.Diploids are 2A type except ’Shangri-La d’and Baoshan populations which are 3A type,tetraploids are 2A type except Huize and Hezhang populations which are 2B type.The asymmetry index(AI) comparison indicates that the tetraploids in northwestern Yunnan are likely to be more ancient than those in other areas.The karyotype similarity of diploids and tetraploids indicates a possible autopolyploid origin of tetraploids in this species.

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