摘要
对乌头属AconitumL .2 7个类群的nrDNAITS序列进行了简约法与邻接法分析 ,两种方法得到的系统发育树基本一致。乌头亚属subgen .Aconitum的蔓乌头系ser.Volubilia不是一个单系类群 ,显柱乌头系ser.Stylosa与兴安乌头系ser.Ambigua各自作为单系类群也没有得到支持。特产于云南西北部横断山区的一些种之间存在非常近的系统发育关系 ,说明这些种可能是近期物种形成的产物。紫乌头A .delavayi复合体的不同类群在系统发育树上位于不同的分支中。含西南乌头A .episcopale的分支最为独特 ,处于系统发育树靠近基部的位置 ;松潘乌头A .sungpanense与弯喙乌头A .campylorrhynchum组成一个分支 ;另一个分支含土官村乌头A .tuguancunense、紫乌头A .delavayi、玉龙乌头A .stapfianum与黄草乌A .vilmorinianum。上述结果表明 ,紫乌头A .delavayi复合体不是一个单系类群 ,可能经历了 3次不同的起源。
Internal transcribed spacer (ITS) sequences of nuclear ribosomal DNA (nr DNA) were used to investigate the phylogeny of the Aconitum delavayi complex that was found mainly in Hengduan Mountains, SW China. Based on maximum parsimony and neighbor-joining analyses, we reconstructed the phylogenetic relationships of 27 taxa of Aconitum including 8 taxa of the A. delavayi complex. The two methods generated similar ITS trees, which showed that ser. Volubilia could not be a monophyletic group and that ser. Stylosa could hardly be distinguished from ser. Ambigua. Such results indicate that the present serial delimitation of the subgenus Aconitum made by Wang in Flora Reipublicae Popularis Sinicae is problematic. The close phylogenetic relationships among some species endemic to the Hengduan Mountains in NW Yunnan may be attributed to the recent speciation events of Aconitum species in this area. The Aconitum delavayi complex that mainly occurs in the Hengduan Mountains is separated into three clades in the ITS trees, implying that the complex is not a natural lineage in terms of genetic relationships. Of the three clades, the one including A. episcopale is quite distinct from the clade consisting of A. delavayi, A. tuguancunense, A. stapfianum and A. vilmorinianum, although they are all mainly distributed in NW Yunnan and there is a high degree of morphological similarity among them. Another clade includes A. campylorrhynchum and A. sungpanense from NW Sichuan, NE Chongqing and Shaanxi. Consequently, the A. delavayi complex is not a monophyletic group and may have originated from three different lineages.
出处
《植物分类学报》
CSCD
北大核心
2003年第3期220-228,共9页
Acta Phytotaxonomica Sinica
基金
国家自然科学基金 ( 3 0 0 70 0 5 7)
中国科学院KSCXZ-SW-1 0 1A项目支持~~
