Collaborative Research: Morphological and Molecular Systematics of the Polypodiaceae and Grammitidaceae

合作研究：水龙骨科和拟杆菌科的形态学和分子系统学

• 批准号: 9807053
• 负责人: Alan Smith
• 金额: $ 5.59万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-03-01 至 2002-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9807053&HistoricalAwards=false
• 关键词: Collaborative; Research; Morphological; Molecular; Systematics

9807053 Smith This study is a three-way collaboration between Dr. Alan R. Smith at the University of California, Berkeley, and colleagues, Dr. Thomas Ranker at the University of Colorado and Dr. Christopher H. Haufler at the University of Kansas, that builds upon the previous successful collaborative efforts of fern researchers. This major research initiative will increase our understanding of the evolution and diversification of seedless vascular land plants. The goals of the proposed research are to explore groupings of related species of two advanced fern families (Polypodiaceae and Grammitidaceae), their evolutionary relationships and geographical histories, and morphological changes through time. The 1000 species of ferns are well represented in the tropical regions around the world and have relatively few temperate members, except for the genus Polypodium itself. Although ferns in general are ancient plants, recent analyses of the relationships of fern families suggest that species in these two families originated more recently than any other ferns. Such a recent origin suggests that a greater proportion of species in these two families should be extant than in other more ancient groups where extinction may have eliminated some groups; efforts to reconstruct the genealogical history of this group may be more successful than those of more ancient, derived groups. This research will consider a large number of species, and will attempt to sample all of about 50 recognized genera and subgenera from both the New World and Old World. Morphological characters and DNA sequences from at least three chloroplast genes will be used in analyses designed to construct hypotheses of the evolutionary history of these families. Quantitative techniques will be used for inferring the historical biogeography of the ferns.

9807053 Smith 这项研究是加州大学伯克利分校的 Alan R. Smith 博士及其同事科罗拉多大学的 Thomas Ranker 博士和堪萨斯大学的 Christopher H. Haufler 博士之间的三方合作，这是建立在蕨类研究人员之前成功的合作努力的基础上的。 这项重大研究计划将增进我们对无籽维管束陆地植物的进化和多样化的了解。拟议研究的目标是探索两个高级蕨类植物科（水龙骨科和拟杆菌科）的相关物种的分组、它们的进化关系和地理历史，以及随时间的形态变化。 这 1000 种蕨类植物在世界各地的热带地区都有很好的代表性，而除了水龙骨属本身外，温带地区的蕨类植物相对较少。尽管蕨类植物总体上是古老的植物，但最近对蕨类植物科关系的分析表明，这两个科的物种比任何其他蕨类植物起源更晚。 如此近的起源表明，这两个科中现存的物种应该比其他更古老的类群中存在的物种更大，在这些更古老的类群中，灭绝可能已经消除了一些类群；重建这个群体的家谱历史的努力可能比那些更古老、派生的群体更成功。这项研究将考虑大量物种，并将尝试对来自新世界和旧世界的所有约 50 个公认的属和亚属进行采样。 至少三个叶绿体基因的形态特征和 DNA 序列将用于分析，旨在构建这些家族进化史的假设。 定量技术将用于推断蕨类植物的历史生物地理学。