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Construction of a mega-scale molecular phylogenetic tree and establishment of a new taxonomic system based on both morphological and molecular data of the monocotyledons

基于单子叶植物形态和分子数据构建超大规模分子系统发育树并建立新的分类系统

基本信息

批准号：
17570084
负责人：
TAMURA Minoru N.
金额：
$ 2.24万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

Using sequences of plastid matK, which was one of the genes recommended as a DNA barcode for land plants, from 1006 samples of 931 genera, we conducted a parsimony analysis to construct a mega-scale phylogenetic tree of the monocots and to evaluate discriminatory power of the matK among monocot genera from the angle of resolution of the phylogenetic tree. Strict consensus of 247,500 equally most parsimonious trees comprises 695 dichotomous branchings and 99 polychotomous branchings. That is, about 88% of branchings is dichotomous. The strict consensus tree includes 236 clades (about 30% of all the clades) that receive 100% bootstrap support and 198 clades (about 25% of all the clades) that receive 90%-99% bootstrap support. Thus, the strict consensus tree resolved the phylogeny of the monocots well, although it is a mega-scale tree composed of more than 1000 samples. Discriminatory power of the matK was confirmed in the monocots. The basic frame of the present mega-scale phylogenetic tree of the monocots well agrees to earlier monocot phylogenetic trees.

利用陆生植物931属1006份样本的质体matK（推荐作为DNA条形码的基因之一）序列进行简约性分析，构建了单子叶植物的大尺度系统发育树，并从系统发育树的分辨率角度评价了matK在单子叶植物属间的区分能力。247,500棵同等最节俭树的严格一致性包括695个二分分支和99个多分分支。也就是说，大约88%的分支是二分类的。严格共识树包括236个分支（约占所有分支的30%）获得100%的引导支持，198个分支（约占所有分支的25%）获得90%-99%的引导支持。因此，严格共识树很好地解决了单子叶植物的系统发育问题，尽管它是一个由1000多个样本组成的超大规模树。市场的歧视性力量在单品中得到证实。目前单子叶大尺度系统发育树的基本框架与早期的单子叶系统发育树基本一致。