Dissertation Research: Integrating Phylogenetic and Taxonomic Studies of the Commelinaceae using Molecular and Morphological Data

论文研究：利用分子和形态学数据整合鸭跖草科的系统发育和分类学研究

• 批准号: 9902015
• 负责人: Jerrold Davis
• 金额: --
• 依托单位: Cornell Univ - State: AWDS MADE PRIOR MAY 2010
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-15 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902015&HistoricalAwards=false
• 关键词: Dissertation; Research; Integrating; Phylogenetic; Taxonomic

9902015Davis and Hardy The flowering plant family Commelinaceae consists of approximately 41 genera and 650 species of perennial or occasionally annual herbs distributed throughout temperate and tropical zones worldwide. Known also as the "Spiderwort Family", the Commelinaceae includes familiar cultivated ornamentals such as Tradescantia and Zebrina (the spiderwort and wandering jew). Common wildflowers include various species of Commelina (dayflowers) among other genera. More numerous but less well known are the tropical genera of the family, some of which are being studied by graduate student Christopher Hardy under the direction of Dr. Jerrold Davis at Cornell University. The goals of this project are to conduct phylogenetic and taxonomic studies within the family on three closely related genera native to the tropical forests of Central and South America. These genera are Cochliostema, Geogenanthus, and an undescribed genus consisting of an estimated six to seven new species.Plants of Cochliostema are unusual for the Commelinaceae in that they are found growing primarily high in forest canopies as epiphytes, some with the "tank plant" habit that resembles bromeliads vegetatively. Plants of Cochliostema also possess the largest flowers known in the family. Geogenanthus consists of five primarily Amazonian species; low growing and rhizomatous, plants of Geogenanthus are distinguished primarily by their unusual habit of bearing flowers at the soil surface and beneath the leaves. Finally, plants of the undescribed genus are rosette understory plants often possessing leaves with deep purple beneath and a brilliant white longitudinal stripe above. The objective of the phylogenetic component of this research is to better understand how these three genera and thirteen to fourteen species are related to one another and to other members of the family. Inferences of phylogenetic relationships will be obtained by analyzing variation in floral and vegetative structure in addition to DNA sequences from nuclear and chloroplast genes. The sequence of evolutionary divergences in this phylogeny will establish hypotheses about the evolution of the large and bizarre floral forms in the group. A taxonomic treatment (monograph) of this group will include keys and new or updated descriptions of all species of the several genera.

9902015Davis 和 Hardy 开花植物鸭跖草科由大约 41 属和 650 种多年生或偶尔一年生草本植物组成，分布在全世界温带和热带地区。鸭跖草科也被称为“蜘蛛草科”，包括常见的栽培观赏植物，如紫露草和泽布丽娜（蜘蛛草和流浪犹太人）。常见的野花包括各种鸭跖草属（白昼花）等属。该科的热带属数量较多，但不太为人所知，康奈尔大学研究生克里斯托弗·哈迪 (Christopher Hardy) 在杰罗德·戴维斯 (Jerrold Davis) 博士的指导下正在研究其中一些属。该项目的目标是对原产于中美洲和南美洲热带森林的三个密切相关的属进行系统发育和分类学研究。这些属是 Cochliostema、Geogenanthus 和一个未描述的属，估计由六到七个新物种组成。 Cochliostema 植物对于鸭跖草科来说是不寻常的，因为它们主要作为附生植物生长在森林冠层的高处，有些还带有“坦克植物”类似于凤梨科植物的习性。 Cochliostema 植物还拥有该科中已知的最大的花朵。 Geogenanthus 主要由五个亚马逊物种组成；地花属植物生长缓慢，根茎丰富，其特点主要在于其在土壤表面和叶下开花的不寻常习性。最后，未描述属的植物是莲座丛林下植物，通常具有下面深紫色的叶子和上面亮白色的纵向条纹。这项研究的系统发育部分的目的是更好地了解这三个属和十三至十四个物种如何彼此相关以及与该科的其他成员如何相关。除了核基因和叶绿体基因的 DNA 序列之外，还可以通过分析花和营养结构的变异来推断系统发育关系。这一系统发育中的进化分歧序列将建立关于该群体中大型而奇异的花形进化的假设。该组的分类学处理（专着）将包括几个属的所有物种的索引和新的或更新的描述。