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首页> 美国卫生研究院文献>Annals of Botany >Phylogenetic Relationships in Bupleurum (Apiaceae) Based on Nuclear Ribosomal DNA ITS Sequence Data
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Phylogenetic Relationships in Bupleurum (Apiaceae) Based on Nuclear Ribosomal DNA ITS Sequence Data

机译：基于核糖体DNA ITS序列数据的柴胡（系统）的系统发生关系

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• Backgroud and Aims The genus Bupleurum has long been recognized as a natural group, but its infrageneric classification is controversial and has not yet been studied in the light of sequence data.• Methods Phylogenetic relationships among 32 species (35 taxa) of the genus Bupleurum were investigated by comparative sequencing of the ITS region of the 18–26S nuclear ribosomal DNA repeat. Exemplar taxa from all currently accepted sections and subsections of the genus were included, along with outgroups from four other early branching Apioideae genera (Anginon, Heteromorpha, Physospermum and Pleurospermum).• Key Results Phylogenies generated by maximum parsimony, maximum likelihood, and neighbour‐joining methods show similar topologies, demonstrating monophyly of Bupleurum and the division of the genus into two major clades. This division is also supported by analysis of the 5.8S coding sequence alone. The first branching clade is formed by all the species of the genus with pinnate‐reticulate veined leaves and B. rigidum with a unique type of leaf venation. The other major clade includes the remaining species studied, all of which have more or less parallel‐veined leaves.• Conclusions These phylogenetic results do not agree with any previous classifications of the genus. Molecular data also suggest that the endemic Macaronesian species B. salicifolium is a neoendemic, as the sequence divergence between the populations in Madeira and Canary Islands, and closer mainland relatives in north‐west Africa is small. All endemic north‐west African taxa are included in a single unresolved but well‐supported clade, and the low nucleotide variation of ITS suggests a recent radiation within this group. The only southern hemisphere species, B. mundii (southern Africa), is shown to be a neoendemic, apparently closely related to B. falcatum, a Eurasian species.
机译：•背景和目的柴胡属早已被认为是一个自然群体，但其亚属分类是有争议的，尚未根据序列数据进行研究。•方法柴胡属32种（35类群）之间的系统发生关系通过对18–26S核糖体DNA重复序列的ITS区进行比较测序研究。包括该属所有目前公认的部分和小节的示例分类群，以及其他四个早期分支的Apioideae属（Anginon，Hteromorpha，Physospermum和Pleurospermum）的外群。•主要结果由最大简约性，最大似然性和邻居产生的系统发育连接方法显示出相似的拓扑结构，证明柴胡的单性和将属分为两个主要进化枝。仅通过分析5.8S编码序列也可以支持此划分。第一个分支进化枝由羽状网状叶脉的所有属和具有独特叶脉类型的僵硬芽孢杆菌形成。其他主要进化枝包括研究的其余物种，所有这些物种都具有或多或少的平行叶脉。•结论这些系统发育结果与该属以前的任何分类都不符。分子数据还表明，特有的马卡罗语种沙门氏菌是新流行的，因为马德拉岛和加那利群岛的种群之间的序列差异很小，而西北非洲的近亲相对较小。所有地方性的西北非洲分类群都包含在一个未解析但得到良好支持的进化枝中，而ITS的低核苷酸变异表明该群体最近有辐射。唯一的南半球物种，蒙脱芽孢杆菌（B. mundii）（非洲南部），是新流行病，显然与欧亚芽孢杆菌（B. falcatum）密切相关。

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