【摘要】 通过对中国西南部 3种菖蒲属 (AcorusL .)植物 (菖蒲A .calamusL .、石菖蒲A .tatarinowiiSchott和金钱蒲A .gramineusSoland .)的细胞学研究 ,发现分布在云南及四川的 9个菖蒲居群中 ,有 5个居群为四倍体 (2n =4x =44 ) ,4个居群为六倍体 (2n =6x =6 6 )。其中四倍体见于滇南及川西南 ;六倍体见于滇中及滇西北 ,并为首次报道。在云南及贵州分布的石菖蒲及金钱蒲 5个居群均为二倍体。讨论了菖蒲分布区从二倍体、三倍体、四倍体和六倍体 4种不同倍性居群的分布规律和可能的演化关系 ,六倍体居群的产生很可能与喜马拉雅造山运动有关更多还原

【Abstract】 Chromosome counts of three Acorus species ( A. calamus L., A. tatarinowii Schott and A. gramineus Soland.) were performed in the Southwestern China. Both A. tatarinowii and A. gramineus shared the same chromosome numbers 2n=24. Populations of A.calamus in South and Southwestern Yunnan are tetraploids (2n=44) while those in the central and northwestern Yunnan being hexaploids (2n=66). The hexaploids are reported here for the first time. Attention was drawn to the ploidy pattern in A.calamus . It seems that the hexaploids were evolved from their ancestors during the early Tertiary as an impact of orogenesis of the Himalayas.更多还原