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这项研究是加利福尼亚大学伯克利分校的Alan R. Smith博士与科罗拉多大学科罗拉多大学的Thomas Ranker博士与堪萨斯大学的Christopher H. Haufler博士之间进行的三路合作，这是基于先前的弗恩研究人员的先前成功合作努力。 这项重大研究计划将提高我们对无种子血管土地植物的进化和多样化的理解。拟议的研究的目标是探索两个高级蕨类植物（Polypodiaceae和grammitidaceae）的相关物种的分组，它们的进化关系和地理历史以及随着时间的流逝的形态变化。 1000种蕨类植物在世界各地的热带地区都很好地代表，除了息肉属本身，温带成员相对较少。尽管蕨类植物通常是古老的植物，但最近对蕨类植物关系的分析表明，这两个家族的物种比其他任何蕨类植物都更具起源。 如此近期的起源表明，这两个家庭中的物种比例比在灭绝可能消除了某些群体的其他更古老的群体中应该存在。重建该群体的家谱历史的努力可能比更古老，衍生的群体更成功。这项研究将考虑大量物种，并尝试从新世界和旧世界中对大约50个公认的属和亚属进行采样。 来自至少三个叶绿体基因的形态特征和DNA序列将用于旨在构建这些家族进化史的假设的分析中。 定量技术将用于推断蕨类植物的历史生物地理学。