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首页> 外文学位 >The phylogeny and biogeography of Osmanthus, Cercis, and Tilia based on ITS nuclear ribosomal, ndhF and trnL-F chloroplast DNA sequence data.
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The phylogeny and biogeography of Osmanthus, Cercis, and Tilia based on ITS nuclear ribosomal, ndhF and trnL-F chloroplast DNA sequence data.

机译：基于ITS核糖体，ndhF和trnL-F叶绿体DNA序列数据的桂花，紫荆和T树的系统发育和生物地理。

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摘要

The similarity between the forests of eastern North America and eastern Asia has intrigued botanists since the time of Linnaeus. This biogeographic pattern is currently recognized by the disjunct distribution of approximately 65 genera. To estimate relationship between disjunct species on American and Eurasian continents, a molecular systematic analysis was conducted on three Tertiary disjunct genera: Osmanthus (the wild olives), Cercis (the red buds), and Tilia (the lindens). DNA was extracted from leaves of species from each genus and DNA sequences were generated for the internal transcribed spacer (ITS) region of nuclear ribosomal DNA, ndhF and trnL-F spacer regions of chloroplast DNA. Percent sequence divergence for the species of Osmanthus ranged between 0.28% and 9.17%, for the species of Cercis between 0.57% and 3.59%, for the species of Tilia between 0.00% and 7.78%. Using the sequence data for each genus, I constructed phylogenies (evolutionary hypotheses). The phylogenies generated by my work indicate that previously hypothesized intrageneric classification systems within Osmanthus, Cercis, and Tilia do not reflect the relationships for their respective species. Previously proposed Osmanthus taxonomy does coincide with my phylogenetic hypothesis. However, my data does not support the previous classification of Tilia by Engler 1909. Area cladograms were constructed for each genus by mapping the modern distributions of these plants onto phylogenetic trees. My data does not support a simple general explanation of a biogeographic pattern that can be applied to all taxa included in this analysis. It suggests a complex biogeographic pattern involving vicariance, long distance dispersal, and repeated migrations through Bering land bridge.
机译：自Linnaeus时代以来，北美东部和东亚森林之间的相似性就吸引了植物学家的注意。目前，大约65属的分离分布可以识别这种生物地理模式。为了估算美洲大陆和欧亚大陆上分离物种之间的关系，对三个第三分离属进行了分子系统分析：桂花（野橄榄），紫荆（红芽）和紫ilia（菩提树）。从每个属的物种的叶子中提取DNA，并为核糖体DNA的内部转录间隔区（ITS），叶绿体DNA的ndhF和trnL-F间隔区生成DNA序列。桂花树种的序列差异百分比在0.28％和9.17％之间，紫苏树种在0.57％和3.59％之间，紫ilia树种在0.00％和7.78％之间。使用每个属的序列数据，我构建了系统发育史（进化假设）。我的工作所产生的系统发育史表明，先前在桂花，紫荆和T树属中假设的属内分类系统并未反映出它们各自物种的关系。先前提出的桂花分类法确实与我的系统发育假设相吻合。但是，我的数据不支持Engler 1909年以前对Tilia的分类。通过将这些植物的现代分布图绘制到系统树上，为每个属构建了区域枝状图。我的数据不支持对可用于此分析中所有分类单元的生物地理模式进行简单的一般解释。它表明了一个复杂的生物地理模式，包括生机勃勃，远距离分散和通过白令陆桥的反复迁移。

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  • 作者

    Coskun, Fatih.;

  • 作者单位

    The University of North Carolina at Chapel Hill.;

  • 授予单位 The University of North Carolina at Chapel Hill.;
  • 学科 Biology Botany.;Biology Molecular.;Biology Genetics.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 199 p.
  • 总页数 199
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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