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

关于天竺葵亚科的划分和分类仍有很大分歧，因此属和属的分类成为天竺葵科亟待解决的系统问题之一。亚科的各种分类已经提出，并有两种对立的观点。一种观点认为景天属是一个完整的分类单元，在景天亚科下只划分出几个属；另一种观点则根据景天属独特的形态特征，从景天属中划分出一些属（如红景天属、水仙属、Phedimus属），并在亚科下划分出一些属。有必要通过检验景天属的单系地位和澄清它们与景天属的系统发育关系来解决这些相互矛盾的观点。景天科约有300种分布在东亚地区（Ohba 1978），大多数从景天科分离出来的属都局限于东亚地区。因此，这一地区既可以被视为属类和属类多样化的中心，也可以被视为sedo总科的分布中心。利用cpDNA trnL-trnF间隔区和核糖体重复序列的内部转录间隔区序列变异，在东亚大范围内估计了Sedoideae的系统发育，以澄清亚洲Sedoideae的系统发育位置。我们的结果与大多数以前的研究一致，除了电话进化。除景天属外的所有东亚属。结果表明，该支系与红景天（Rhodiola）、水螅（Hylotelephium）、Phedimus和脐部（Umbilicus）四个亚支系具有明显的多系性。从景天属分离出来的所有东亚属，在一个与景天属不同的谱系中分离。Hylotelephium、Orostachys、Meterostachys和Sinocrassula亲缘关系密切。Hylotelephium是多系的，Orostachys也是。本讲座将介绍我们对昆吉亚的初步研究。少

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