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Speciation and diversification of populations based on disjunct distribution of primitive monocotyledons

基于原始单子叶植物间断分布的种群物种形成和多样化

基本信息

批准号：
15570083
负责人：
TAMURA Minoru N.
金额：
$ 2.37万
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：
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

This study was carried out from the respects of phylogeny, phytogeography and taxonomy at specific level and at infraspecific level, focusing especially on the Tofieldiaceae that have been considered one of the most morphologically primitive monocots and are disjunctly distributed, growing in rocky alpine places, alpine meadows, rock faces along rivers, etc., and often on calcareous soils.First, using plastid trnK, trnL and trnL-F sequences and nuclear ITS sequences, we conducted a combined analysis to clarify phylogenetic relationships of the species and infraspecific taxa of Tofieldia and Triantha. Among the three clades that constitute Tofieldia and the clade covering Triantha, each clade turned out to consist of one widely distributed boreal species, with several localized southern species, excepting the clade of Tofieldia calyculata that occupies an isolated phylogenetic position. Further, morphology of leaf apex and leaf margin proved to be of great taxonomic value in Tofieldia.Second, in order to reexamine the taxonomic coherence of Tofieldia nuda, which is disjunctly distributed in eight areas of East Asia, we included individuals from all of the eight distribution areas of T. nuda in the molecular as well as morphological analyses, and proved that T. nuda contains three species and two varieties. The first species corresponds to T. nuda sense stricto, being sister to Tofieldia coccinea. The second species corresponds to Tofieldia furusei, to which we change the status from T. nuda var. furusei. This species is sister to the clade of Tofieldia divergens and Tofieldia thibetica. The third species corresponds to Tofieldia yoshiiana, which was often reduced to T. nuda by former taxonomists. Tofieldia yoshiiana is further divided into three varieties, i.e. var. yoshiiana, var. kanwonensis, comb. nov., and var. hyugaensis, var. nov.

本研究从系统发育、系统发育、植物地理学和种下系统学两个方面进行了研究，重点研究了分布于高山岩石、高山草甸、沿河岩面等地、常在石灰性土壤上分布的、形态上最原始的单子叶植物之一的香椿科植物。在组成Tofieldia的三个分支和覆盖Triantha的分支中，每个分支由一个广泛分布的北方种组成，除Tofieldia calyculata分支占据孤立的系统发育地位外，还有几个局部化的南方种。其次，为了重新检验分布于东亚8个地区的裸露香椿的分类一致性，我们从分子和形态两个方面对裸露香椿的所有8个分布区的个体进行了分析，证明了裸露香椿包含3个种和2个变种。第一个种对应于T.nuda Sense Stricto，是球果毛虫的姊妹种。第二个种对应于毛果卷蛾，我们将其状态从光球卷蛾改为光球卷蛾。毛瑟西。本种是分歧型毛果和硫化毛果的分支的姐妹。第三种对应于Tofieldia yoshiiana，这通常被以前的分类学家归结为T.nuda。吉氏香椿进一步分为三个变种，即变种。Yoshiiana var.Kanwan、comb.Nov.和var.Hyugaensis，var.11月