RUI: Tree Fern Phylogeny and Evolution: Molecular EvidenceFrom Two Genomes

RUI：树蕨系统发育和进化：来自两个基因组的分子证据

• 批准号: 9307211
• 负责人: Diana Stein
• 金额: $ 13.3万
• 依托单位: Mount Holyoke College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9307211&HistoricalAwards=false
• 关键词: RUI; Tree; Fern; Phylogeny; Evolution

9307211 Stein and Conant The tree ferns of the world, placed in the family Cyatheaceae, are a large group of ferns, ca. 500 species, with little variation in chromosome number. In this they are unusual for ferns, where polyploidy (chromosome complement doubling) and dysploidy (increase or decrease of individual chromosome pairs) mark many lineages. Possibly novel mechanisms of species divergence may operate in the tree ferns, such as diploid level speciation after hybridization. To explore such mechanisms, however, a phylogenetic framework for the tree ferns is required, in order to rationalize the choice of target or representative species for analysis. Drs. Stein and Conant are continuing their phylogenetic analyses of tree ferns, concentrating now on Old World species from the australasian regions. They are analyzing DNA mutations in chloroplast and nuclear genes to acquire new molecular data for phylogenetic reconstruction and to integrate with traditional morphological characters from fern taxonomy. %%% New molecular data from gene sequencing are revolutionizing our understanding of the evolutionary relationships of organisms. Work on Old World tree ferns will add data from both chloroplast and nuclear genes to traditional morphological features, to augment work on New World tree ferns. A robust phylogeny for this large group of plants will allow focused study on novel mechanisms of speciation and further analysis of t he direction of change in anatomical and ecological features of these ferns.

9307211斯坦和科南特 世界上的树蕨，被归入桫椤科，是蕨类植物的一个大类群。500种，染色体数目变异很小。 在这一点上，它们在蕨类植物中是不寻常的，其中多倍性（染色体互补加倍）和异倍性（单个染色体对的增加或减少）标志着许多谱系。 可能是新的机制，物种分化可能会在树蕨，如二倍体水平的物种形成杂交后。 然而，为了探索这种机制，需要一个系统发育框架的树蕨，以合理选择的目标或代表性的物种进行分析。 斯坦博士和科南特博士正在继续他们对树蕨的系统发育分析，现在集中在来自澳大利亚地区的旧大陆物种上。 他们正在分析叶绿体和核基因中的DNA突变，以获得系统发育重建的新分子数据，并与蕨类植物分类学的传统形态特征相结合。%%% 来自基因测序的新分子数据正在彻底改变我们对生物进化关系的理解。 对旧大陆树蕨的研究将把叶绿体和核基因的数据添加到传统的形态特征中，以加强对新大陆树蕨的研究。 这一大群植物的一个强大的系统发育将允许集中研究新的物种形成机制，并进一步分析这些蕨类植物的解剖和生态特征的变化方向。