Dissertation Research: Host Race Formation and Phylogeography of a Plant Parasite

论文研究：植物寄生虫的宿主种族形成和系统发育地理学

• 批准号: 0206238
• 负责人: Jeffry Mitton
• 金额: $ 0.99万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-06-15 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206238&HistoricalAwards=false
• 关键词: Dissertation; Research; Host; Race; Formation

The dwarf mistletoe, Arceuthobium divaricatum, is a parasitic plant that parastizes six species of pinon pines in the southwest. This project will examine the effects of host selection, historic geographic isolation and subsequent host migration on the patterns of genetic differences among populations of A. divaricatum. The goal of this study is to determine how these factors together have fostered the evolution of A. divaricatum. Chloroplast DNA sequences will be used to determine if host selection has played a role in the evolution of A. divaricatum. In addition, sequence variation will be analyzed to determine whether population differentiation due to historic geographic isolation can be detected. Few studies have simultaneously examined the influence of host selection and historic geographic isolation on the differentiation of populations within a species. Often, evolutionary biologists credit either one or the other of these factors in shaping these population differences. This study in A. divaricatum will enhance the understanding of how various factors influence the evolution of a species. Additionally, because very little is known about population structures of parasitic plants, this study will enhance the understanding of migration, gene flow and population differentiation in a parasitic plant species.

寄生植物是寄生在西南部6种松树上的一种寄生植物。本项目将研究寄主选择、历史地理隔离和随后的寄主迁移对不同种群间遗传差异模式的影响。这项研究的目的是确定这些因素是如何共同促进了地衣藻的进化。叶绿体DNA序列将被用来确定寄主选择是否在变色紫球藻的进化中发挥了作用。此外，还将分析序列变异，以确定是否可以检测到由于历史地理隔离而导致的种群分化。很少有研究同时考察寄主选择和历史地理隔离对物种内种群分化的影响。通常，进化生物学家将形成这些种群差异归功于这些因素中的一个或另一个。这项研究将加强对不同因素如何影响物种进化的理解。此外，由于对寄生植物的种群结构知之甚少，本研究将加深对寄生植物物种迁移、基因流动和种群分化的理解。