Phylogenetic and Evolutionary Inference in the Collomia-Navarretia Clade (Polemoniaceae)

Collomia-Navarretia 分支（Polemoniaceae）的系统发育和进化推断

• 批准号: 0344837
• 负责人: Leigh Johnson
• 金额: --
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-15 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0344837&HistoricalAwards=false
• 关键词: Phylogenetic; Evolutionary; Inference; Collomia; Navarretia

Research by Dr. Leigh Johnson at Brigham Young University focuses on a group of about 50 species of annual plants that belong to the phlox family (Polemoniaceae). Several species in the genera of Collomia and Navarettia have very limited distributions and are listed as "species of concern" on federal or individual state conservation lists. Preliminary investigation of these species shows two unexpected patterns: substantial morphological divergence with little genetic divergence between two major subsets of species, and substantial genetic divergence with almost no morphological divergence between populations of what have been considered to be the same species. The factors and processes that cause discordance between morphological and genetic divergence are poorly understood in general. This group provides a model for investigating these processes, which are fundamental to understanding the nature of plant diversity and making informed decisions in species management efforts. The research proposed encompasses several thrusts: 1) Determining phylogenetic relationships among the species to provide a solid framework for addressing questions of morphological and genetic divergence. This will be accomplished from comparative analyses of DNA sequence variation from multiple genes, and analyzing the plants morphologically. 2) Revising the taxonomy of the group based on the information learned, and constructing identification keys for use by specialists and laypersons that encounter these species. 3) Testing hypotheses of discordance between morphology and genetic divergence using DNA sequence variation and morphological variation mentioned above, and examining a specific hypothesis of genetic control that may contribute to this discordance. 4) Assessing correlations between morphological features associated with reproduction and the degree of species rarity to see if predictions of rarity can be made based on such features. A methodological approach that uses both morphology and DNA sequence data is being followed to maximize the information available to characterize the diversity of these species. Because species are the basic units of conservation in plants, understanding the relationship between morphological variation, molecular variation, and rarity is important for conservation decisions. This research addresses the need for such information in an educational setting that includes research university faculty, post-doctoral students, graduate students, and undergraduate students in a mentored learning environment. Effort is being made to include persons from underrepresented groups within this research environment. An essential collaborative tie has also been established with researchers from Argentina that will facilitate fieldwork in that country as well as co-authorship of publications. In addition to anticipated peer-reviewed publication of this work, the PI will be author or co-author of taxonomic treatments of these species for several identification manuals, such as the Flora of North America, that are intended for non-specialists as well as specialists. General information on species biology and identification will be made freely available from the Tree of Life web site on the internet.

杨百翰大学 Leigh Johnson 博士的研究重点是属于福禄考科（Polemoniaceae）的约 50 种一年生植物。科洛米亚属和纳瓦雷蒂亚属的几个物种的分布非常有限，在联邦或各州的保护名单上被列为“受关注物种”。对这些物种的初步调查显示了两种意想不到的模式：物种的两个主要亚群之间存在显着的形态差异，但遗传差异很小；以及被认为是同一物种的种群之间存在显着的遗传差异，但几乎没有形态差异。一般而言，人们对导致形态和遗传差异之间不一致的因素和过程知之甚少。该小组提供了一个研究这些过程的模型，这对于理解植物多样性的本质和在物种管理工作中做出明智的决策至关重要。拟议的研究包括几个主旨：1）确定物种之间的系统发育关系，为解决形态和遗传差异问题提供坚实的框架。这将通过对多个基因的 DNA 序列变异进行比较分析以及对植物进行形态学分析来完成。 2）根据所获信息修改该类群的分类法，并构建识别码以供遇到这些物种的专家和外行使用。 3）使用上述DNA序列变异和形态变异来测试形态学和遗传分化之间不一致的假设，并检查可能导致这种不一致的遗传控制的特定假设。 4）评估与繁殖相关的形态特征与物种稀有程度之间的相关性，看看是否可以根据这些特征做出稀有度预测。我们正在遵循一种同时使用形态学和 DNA 序列数据的方法，以最大限度地利用可用信息来表征这些物种的多样性。由于物种是植物保护的基本单位，因此了解形态变异、分子变异和稀有性之间的关系对于保护决策非常重要。这项研究解决了教育环境中对此类信息的需求，其中包括研究型大学教师、博士后学生、研究生和本科生在指导学习环境中的情况。我们正在努力将代表性不足的群体的人纳入这一研究环境中。还与阿根廷的研究人员建立了重要的合作关系，这将促进在该国的实地考察以及出版物的共同作者。除了预期的同行评审出版物之外，PI 还将作为这些物种的分类学处理的作者或合著者，编写一些鉴定手册，例如面向非专家和专家的《北美植物志》。有关物种生物学和鉴定的一般信息将在互联网上的生命之树网站上免费提供。