The Phylogenetic Position of Eastern Asian Sedoideae (Crassulaceae) Inferred from Chloroplast and Nuclear DNA Sequences

从叶绿体和核DNA序列推测东亚景天科的系统发育位置

基本信息

批准号：
15570074
负责人：
OHBA Hideaki
金额：
$ 2.24万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Opinions about the delimitation and classification of the subfamily Sedoideae are still highly divergent, and thus the generic and infrageneric classification becomes one of urgent systematic problems in Crassulaceae. Various classifications of the subfamily have been proposed and there are two opposing viewpoints. One view retains Sedum as a catchall taxon and recognizes only a few additional genera under the Sedoideae, and the other segregates some groups as genera (e.g., Rhodiola, Hylotelephium, Phedimus) from Sedum on the basis of unique sets of morphological characters and recognizes a number of genera under the subfamily. It is necessary to resolve these conflicting viewpoints by testing the monophyletic status of genera separated from Sedum and clarifying their phylogenetic relationships to Sedum (s. str.). About 300 species of Sedoideae are distributed in the eastern Asian region (Ohba 1978) and most genera segregated from Sedum are restricted in eastern Asia. This region can t … More herefore be regarded as both a center of generic and infrageneric diversification and a center of distribution for the Sedoideae.I estimated the phylogeny of the Sedoideae on a broad scale across eastern Asia using sequence variation of the cpDNA trnL-trnF spacer and the Internal Transcribed Spacer regions of the nuclear ribosomal repeats to clarify the phylogenetic positions of Asian Sedoideae. Our results agreed with most of the former studies, except for the Telephium clade. All eastern Asian genera except Sedum(s. str.) were in groups corresponding to the Telephium clade and the clade was determined to be polyphyletic with four strongly supported subclades, Rhodiola, Hylotelephium, Phedimus, and Umbilicus. All eastern Asian genera segregated from Sedwnare separated in a lineage distinct from Sedum (s. str.). Hylotelephium, Orostachys, Meterostachys, and Sinocrassula are closely related. Hylotelephium is polyphyletic, as is also Orostachys. In this lecture our preliminary study on Kungia will be introduced. Less

关于景天亚科的划界和分类仍存在很大分歧，因此景天科的属属和属下分类成为亟待解决的系统问题之一。人们提出了景天亚科的各种分类，其中一种观点保留了景天属。作为一个包罗万象的分类单元，仅识别 Sedoideae 下的一些额外属，而另一个则将一些类群分离为属（例如红景天， Hylotelephium，Phedimus）基于独特的形态特征，并识别了该亚科下的许多属，有必要通过测试从景天中分离出来的属的单系状态并阐明它们与景天的系统发育关系来解决这些相互矛盾的观点。 (s. str.) 大约 300 种 Sedoideae 分布在东亚地区 (Ohba 1978) 和大多数属。与景天分离的植物仅限于东亚地区。因此，该地区不能被视为属属和属下多样化的中心，也是景天科的分布中心。我在整个东亚范围内估计了景天科的系统发育。利用 cpDNA trnL-trnF 间隔区和核核糖体重复序列的内部转录间隔区的序列变异来阐明亚洲人的系统发育位置我们的结果与大多数以前的研究一致，除了 Telephium 分支之外，除景天属 (Sedum(s. str.)) 外，所有东亚属都属于与 Telephium 分支相对应的群体，并且该分支被确定为具有四个支持的分支的多系群。所有从 Sedwna 中分离出来的东亚属都与景天 (s. Hylotelephium、Orostachys、Meterostachys 和Sinocrassula 是多系的，在本讲座中我们将介绍Kungia 的初步研究。