Phylogenetic analysis of the Lythraceae based on four gene regions and morphology
Phylogenetic analysis of the Lythraceae based on four gene regions and morphology
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DOI：
10.1086/432631
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发表时间：
2005-11-01
影响因子：
2.3
通讯作者：
Shi, SH
中科院分区：
文献类型：
--
作者：
Graham, SA;Hall, J;Shi, SH
文章题目千屈菜科的科限及其种间关系。31属仍然知之甚少，尽管以前的系统发育研究。我们使用形态和DNA序列的rbcL基因，trnL-F区域，和psaA-ycf 3基因间的叶绿体和核的内部转录间隔区的间隔区，以探索多达27属千屈菜狭义和单属家庭Duabangaceae，石榴科，海桑科，菱角科的关系。采用最大简约法、最大似然法和贝叶斯似然法。形态学单独提供了很少的系统发育分辨率。从个别基因区域的结果相对较好地解决，并在很大程度上一致，而基础的关系支持不足。20个属的基因组合分析产生了一个完全解决的最大简约树，对应密切的最大似然和贝叶斯树，其中一个单系千屈菜科包括Duabanga，石榴，海桑，菱作为家庭内的衍生属。在最大简约树和贝叶斯树中，Decodon是该家族其他成员的姐妹，其次是Lythrum和Peplis，然后是该家族的其他成员，它们分化为两个超分支。在最大似然树中，该家族在基部分叉成两个超分支。六冠分支得到很好的支持，但缺乏独特的形态学synapomorphies。无论是超分支还是冠分支都不符合目前的部落和亚部落分类。新大陆属嵌入在四个旧大陆分支中。如果北方半球的Decodon属、千屈菜属和Peplis属的基部和近基部位置得到确认，则该科的起源更可能是劳亚纪而不是冈瓦纳纪。该科的生物地理学和早期化石记录表明，该科起源于白垩纪晚期，到始新世晚期已广泛分化并辐射到东南亚和北美。
The family limits of the Lythraceae and relationships among the ca. 31 genera remain poorly known in spite of previous phylogenetic studies. We use morphology and DNA sequences from the rbcL gene, the trnL-F region, and psaA-ycf3 intergenic spacer of the chloroplast and the internal transcribed spacer region of the nucleus to explore relationships for up to 27 genera of the Lythraceae sensu stricto and the monogeneric families Duabangaceae, Punicaceae, Sonneratiaceae, and Trapaceae. Maximum parsimony, maximum likelihood, and Bayesian likelihood approaches are employed. Morphology alone provided little phylogenetic resolution. Results from individual gene regions were relatively well resolved and largely congruent, whereas basal relationships were poorly supported. A combined gene analysis of 20 genera produced one fully resolved maximum parsimony tree that corresponded closely to the maximum likelihood and Bayesian trees in which a monophyletic Lythraceae includes Duabanga, Punica, Sonneratia, and Trapa as derived genera within the family. Decodon is sister to the rest of the family in the maximum parsimony and Bayesian trees, followed by Lythrum and Peplis at the node above and then by the rest of the family, which diverges into two superclades. In the maximum likelihood tree, the family diverges at the base into two superclades. Six crown clades are well supported but lack unique morphological synapomorphies. Neither superclades nor crown clades correspond to the present tribal and subtribal classification. The New World genera are embedded in four Old World clades. If the basal and near-basal positions for the Northern Hemisphere genera Decodon, Lythrum, and Peplis are confirmed, the origin of the family is more likely Laurasian than Gondwanan. The biogeography and early fossil record of the family indicate that the family originated by the late Cretaceous and had extensively diversified and radiated into Southeast Asia and North America by the lower Eocene.