Dissertation Research: Systematic Analysis of Isoetes in North America

论文研究：北美水韭的系统分析

• 批准号: 9321767
• 负责人: Edward Schilling
• 金额: $ 0.64万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-03-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9321767&HistoricalAwards=false
• 关键词: Dissertation; Research; Systematic; Analysis; Isoetes

9321767 Schilling Under the direction of faculty adviser Dr. Edward Schilling at the University of Tennessee, graduate student Robert Duff is employing molecular and morphological analyses to study the North American species of the primitive, spore-bearing plant Isoetes. The so-called quillworts (from the quill-like resemblance of their small leaves) grow in ponds, streams, or vernal pools, usually in small and highly restricted populations, scattered across the continent. Currently about 25 species are recognized in North America, and about 150 total in the world. The fossil record of quillworts shows the genus to be ancient; there is some evidence that it is one of the three surviving genera of the most primitive lineage of vascular land plants. New molecular data from chloroplast DNA restriction-enzyme mapping and from nucleotide sequencing of nuclear ribosomal DNA will be compared to traditional taxonomic information from morphology and chromosomes to develop a robust hypothesis of phylogenetic relationships of the North American species, and then to explore patterns of character evolution and geographical distribution. The generation of new molecular evidence from DNA analyses and the integration of that information with traditional morphological characters are revitalizing the taxonomic study of plants. Isoetes will be better understood as a result of this investigation.

9321767 Schilling 在田纳西大学的导师 Edward Schilling 博士的指导下，研究生 Robert Duff 正在利用分子和形态分析来研究北美的原始孢子植物水韭属物种。 所谓的鹅毛笔植物（因其小叶子与羽毛笔相似）生长在池塘、溪流或春天的水池中，通常数量很少且受到严格限制，散布在整个大陆。 目前北美约有 25 种，全世界约有 150 种。 水貂的化石记录表明该属的历史非常悠久。有一些证据表明它是维管束陆地植物最原始谱系的三个幸存属之一。 来自叶绿体 DNA 限制酶图谱和核糖体 DNA 核苷酸测序的新分子数据将与来自形态和染色体的传统分类信息进行比较，以制定北美物种系统发育关系的可靠假设，然后探索特征模式演化和地理分布。 DNA 分析产生的新分子证据以及该信息与传统形态特征的整合正在重振植物分类学研究。 这项调查的结果将让人们更好地了解水韭。