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Research on Phylogeny and Speciation in Osmundaceae (Pteridophytes)

紫萁科（蕨类植物）系统发育和物种形成研究

基本信息

批准号：
15570085
负责人：
IWATSUKI Kunio
金额：
$ 2.3万
依托单位：
The University of the Air
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

To elucidate the biodiversity in Osmundaceae, two directions of biological analysis were designed, i.e. (1) establishment of natural system of classification based on phylogenetic researches, and (2) complement of monographic revision for Species Plantarum, based on research in speciation.(1) Natural system of classification. A new system of 4 genera and 6 subgenera is proposed, based on the research on molecular phylogeny and cooperative anatomy. Osmundastrum is treated as a monotypic genus, although the second species, O. claytoniana, was usually included in it. Osumunda claytoniana, is then treated as to form a monotypic subgenus under the genus Osmunda, for this subgenus, a new name, Claytosmuda, is proposed with a new description.(2) Monographic revision. Osmundaceae is widely distributed throughout the world. Based on the herbarium materials and field surveys in some important localities, monographic revision is compiled. All the 17 species of this family are classified as : 1 in Osmundastrum, 2 in Todea, 6 in Leptopteris, and 8 in Osmunda, 1 in subgen, Claytosumunda, 3 in subgen. Osmunda, and 4 in subgen. Plenasium. The keys to genera, to subgenera, and to species are prepared. All the taxa are enumerated each with proper synonymy and brief description. This monograph will be published as a part of Species Plantarum, or the Flora of the World.(3) Analysis on speciation. Osmunda X intermedia is inferred as originated from hybridization between O. japonica and O. lancea. This is recognized by the evidences in cytogenetics, and molecular analysis of these complex was made to understand the relationship among them.

为阐明薇菜科植物的生物多样性，设计了两个生物学分析方向：（1）以系统发育研究为基础，建立自然分类体系;（2）以物种形成研究为基础，补充植物种专题修订。(1)自然分类系统。在分子系统学和协同解剖学研究的基础上，提出了4属6亚属的新系统。紫萁属（Osmundastrum）是一个单型属，而第二种紫萁属（O. claytoniana，并将Claytoniana归为薇菜属下的一个单型亚属，提出了该亚属的新名称Claytosmuda，并对其进行了新的描述。(2)专题修订。薇菜科植物在世界范围内分布广泛。根据标本室资料和一些重要地点的实地调查，编写了专题修订本。该科17种植物中紫萁属1种，牛肝菌属2种，细羊齿属6种，薇菜属8种，土蕨亚属1种，土蕨亚属3种。薇菜亚属4种。Plenasium。编制了属、亚属、种检索表。所有的分类群都列举了适当的同义词和简短的描述。这本专著将作为《植物物种》或《世界植物群》的一部分出版。(3)物种形成分析。Osmunda X intermedia可能起源于O. japonica和O.兰恰。细胞遗传学的证据证实了这一点，并对这些复合物进行了分子分析，以了解它们之间的关系。