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: 9726607
• 负责人: Thomas Ranker
• 金额: $ 8.16万
• 依托单位: University of Colorado at Boulder
• 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 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9726607&HistoricalAwards=false
• 关键词: Collaborative; Research; Morphological; Molecular; Systematics

9726607 Ranker This study is a three-way collaboration between Dr. Thomas Ranker of the University of Colorado, and colleagues, Dr. Alan R. Smith at the University of California, Berkeley, 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.

9726607 排名器 这项研究是科罗拉多大学的托马斯兰克博士和他的同事艾伦R。加州大学伯克利分校的史密斯博士和克里斯托弗·H.这是堪萨斯大学的Haufler博士在蕨类植物研究人员以前成功合作的基础上提出的。 这一重大的研究举措将增加我们对无籽维管陆地植物的进化和多样化的理解。拟开展的研究旨在探讨水龙骨科和Grammitidaceae两个高级蕨类植物科的近缘种的类群、演化关系和地理历史以及形态随时间的变化。 1000种蕨类植物在世界各地的热带地区都有很好的代表性，除了水龙骨属本身之外，温带成员相对较少。虽然蕨类植物一般都是古老的植物，但最近对蕨类植物科之间关系的分析表明，这两个科的物种比任何其他蕨类植物都起源得更近。 这样一个最近的起源表明，在这两个科中的物种的比例应该比其他更古老的群体中的物种更大，在其他更古老的群体中，灭绝可能已经消除了一些群体;重建这个群体的谱系历史的努力可能比那些更古老的，衍生的群体更成功。这项研究将考虑大量的物种，并将尝试从新大陆和旧大陆采集所有约50个公认的属和亚属。 形态特征和DNA序列，从至少三个叶绿体基因将被用于分析，旨在构建这些家庭的进化历史的假设。 定量技术将用于推断蕨类植物的历史地理。