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首页> 外文学位 >Molecular phylogenetics within Croton (Euphorbiaceae S.S.).
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Molecular phylogenetics within Croton (Euphorbiaceae S.S.).

机译：巴豆（Euphorbiaceae S.S.）内的分子系统发育学。

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摘要

Molecular studies of Croton show that a small clade of less than 30 mainly Caribbean and South American species is sister to the ca. 1,200 species in the genus. This thesis explores the phylogenetic relationships, morphology, and biogeography of this smaller clade using DNA sequence analyses. The second chapter deals in detail with Croton alabamensis, a member of this smaller clade and a rare plant found in Texas and Alabama. AFLP analyses along with parsimony, likelihood, and Bayesian analyses of DNA sequence data were performed to discriminate phylogenetic structure and quantify genetic diversity. Most of the molecular variance is accounted for by variance within populations. Approximately equal variance is found among populations within Texas and Alabama and between populations from the two states. Both sequence and AFLP data support the same phylogenetic relationships between C. alabamensis and its relatives, while the AFLP data provide resolution among the various populations. The third chapter reconstructs a phylogenetic hypothesis for the smaller clade of Croton species using DNA sequence data from the nuclear ITS region and the chloroplast rbcL, ndhF, and trnL-trnF regions. Overlaying the morphological characters that have been used historically in Croton taxonomy onto the molecular phylogeny identifies which are homoplasious and which are diagnostic for the main divisions within the genus. A South American origin and a mesic habitat are indicated as ancestral for the genus. The four chloroplast markers showed concordance with one another but were significantly incongruent with the ITS data. An explanation for the incongruence between the genomes is a possible introgression event. Croton poecilanthus , the only tree endemic to Puerto Rico, is identified as a potential hybrid given that chloroplast genome analyses places it closely related to members of section Moacroton, which it greatly resembles, while nuclear ITS analyses place it in an unresolved position at the base of Croton. Chapter five takes all Croton species from mainland Central and North America, which are not necessarily expected to make a monophyletic group, and applies molecular tools to aid in identifying the sections that are represented and assign all species to section.
机译：巴豆的分子研究表明，大约30种主要来自加勒比和南美物种的小进化枝是约克的姐妹。属1200种。本文利用DNA序列分析探索了这个较小进化枝的系统发育关系，形态和生物地理学。第二章详细介绍了巴豆巴豆（Croton alabamensis），它是这种较小进化枝的成员，是德克萨斯州和阿拉巴马州的一种稀有植物。进行AFLP分析，以及对DNA序列数据的简约性，似然性和贝叶斯分析，以区分系统发育结构并量化遗传多样性。大多数分子差异是由群体内的差异引起的。在德克萨斯州和阿拉巴马州之间以及这两个州的人口之间发现了大约相等的方差。序列和AFLP数据都支持阿拉巴马隐孢子虫及其亲属之间的相同系统发育关系，而AFLP数据提供了不同种群之间的分辨率。第三章使用来自核ITS区以及叶绿体rbcL，ndhF和trnL-trnF区的DNA序列数据，为巴豆物种较小的进化枝重建了系统发育假说。将在巴豆分类中历史上使用过的形态特征覆盖到分子系统发育上，以识别哪些是同质的，哪些是对该属内主要部位的诊断。南美起源和内陆生境被指示为该属的祖先。四种叶绿体标记物彼此一致，但与ITS数据显着不一致。基因组之间不一致的解释可能是基因渗入事件。考虑到叶绿体基因组分析将其与Moacroton断面的成员紧密相关，巴豆poecilanthus是波多黎各唯一的特有树，被认为是潜在的杂种，而核ITS分析将其置于基部的一个未解决的位置巴豆第五章介绍了中美洲和北美洲的所有巴豆物种，这些物种不一定被认为是一个单一的种群，并运用分子工具来帮助识别代表的部分并将所有物种分配给该部分。

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  • 作者

    van Ee, Benjamin W.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Biology Botany.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 205 p.
  • 总页数 205
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;
  • 关键词

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