Dissertation Research: Molecular Evolution, Adaptive Radiation, and Geographic Speciation in Banksia (Proteaceae)

论文研究：山龙眼（山龙眼科）的分子进化、适应性辐射和地理物种形成

• 批准号: 9801572
• 负责人: Thomas Givnish
• 金额: $ 1万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-15 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801572&HistoricalAwards=false
• 关键词: Dissertation; Research; Molecular; Evolution; Adaptive

9801572 Givnish This study seeks to make an important contribution toward describing the patterns of evolution in a striking example of continental adaptive radiation. The genus Banksia (Proteaceae) includes 79 species of trees, shrubs, and prostrate woody mats that occur only in Australia and are established in a broad range of climates and soils. Some characters vary greatly among the species, such as the leaves, which may vary from entire to spinose, and these plants display the widest range in lifespan known among flowering plants. In addition several co-occuring pairs of species in Banksia and the related genus Dryandra are remarkably convergent in leaf and flower form. A phylogeetic tree will be developed for Banksia and relatived genera based on variation in chloroplast and nuclear DNA. Once resolved the tree will be used for the following purposes: 1) analysis of the agreement between our DNA data and a recent set of morphological data with the aim of obtaining a classification of Banksia based on both kinds of information; 2) evaluation of the history of species formation within and between different geographic areas; 3) relating evolutionary shifts in plant form and ecology to inferred historical shifts to different climates and/or substrates; and 4) determination of whether the strikingly similarity between coexisting pairs of Banksia and Dryandra species represents evolutionary convergence under similar ecological conditions or the sharing of recent common ancestors. The proposed study will shed light on the history, geographic distribution, and ecology of one of the most diverse and characteristic groups of Australia's vegetation.

9801572 Givnish 这项研究旨在为描述大陆适应性辐射的一个引人注目的例子中的进化模式做出重要贡献。 山龙眼属（山龙眼科）包括 79 种乔木、灌木和匍匐木质垫，仅出现在澳大利亚，并且生长在广泛的气候和土壤中。 一些特征在物种之间差异很大，例如叶子，可能从完整的叶子到有刺的叶子，并且这些植物在开花植物中表现出最大的寿命范围。 此外，山龙眼属和相关的干草属中的几个共生对物种在叶和花的形式上显着趋同。 将根据叶绿体和核 DNA 的变异，为龙眼属和相关属开发系统发育树。 一旦解决，该树将用于以下目的：1）分析我们的 DNA 数据和最近一组形态学数据之间的一致性，目的是根据这两种信息获得班克西亚的分类； 2）评估不同地理区域内和之间的物种形成历史； 3）将植物形态和生态的进化转变与不同气候和/或基质的历史转变联系起来； 4）确定共存的山龙眼属和树干属物种之间的惊人相似性是否代表相似生态条件下的进化趋同或共享最近的共同祖先。 拟议的研究将揭示澳大利亚最多样化和最具特色的植被群之一的历史、地理分布和生态。