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首页> 外文学位 >Systematics of the North American plums (Prunus subgenus Prunus section Prunocerasus; Rosaceae).
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Systematics of the North American plums (Prunus subgenus Prunus section Prunocerasus; Rosaceae).

机译：北美李子的系统学（李子属李子节李；蔷薇科）。

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摘要

The North American plums (Prunus subgenus Prunus section Prunocerasus; Rosaceae) are a closely related group with approximately 17 commonly recognized species and lesser taxa. They are infamous for their very poor development of reproductively isolating barriers and most are interfertile in many combinations. This interfertility blurs nearly all morphologically-based taxonomic boundaries. The aim of this dissertation research was to infer a phylogeny for the group in an attempt to understand their complicated evolutionary history. Emphasis was placed on using molecular tools (e.g., PCR and DNA sequencing) to tease apart their intricate relationships. The importance of this course of study includes but is not limited to: (1) better understanding a difficult group of taxa for academic reasons, (2) accumulating data to better understand these taxa so that conservation efforts can be better focused (e.g., P. geniculata is Federally Endangered), (3) better understanding the relationships among a group of plants with economic importance, (4) testing the limits of tools currently used in plant molecular systematics---the North American plums posit a problem at the boundary between molecular phylogenetics and population genetics, and (5) adding to a body of knowledge surrounding longstanding biogeographic questions of North America.; The results of this course of study showed that (1) predictable rate heterogeneity exists among noncoding cpDNA regions and several rarely used regions provide more mutations to phylogenetic investigations than the most commonly used regions. (2) The North American plums are monophyletic. (3) Most North American plum taxa are para- and polyphyletic with respect to their chloroplasts---more than one of the three primary chloro-haplotypes was observed in 12 of 17 of the North American plum taxa. (4) Most North American plum taxa are not monophyletic with respect to their nuclear encoded s6pdh genes---three primary haplotypes are shared among most taxa. Total evidence provided by this investigation strongly supports the hypothesis of the North American plums are a syngameon, or hybridizing species group.
机译：北美李子（李属李属Prunocerasus；蔷薇科）是一个密切相关的群体，大约有17种公认的物种和较小的分类单元。他们因生殖隔离屏障的发展不佳而臭名昭著，并且大多数在许多组合中都具有干扰性。这种干扰使几乎所有基于形态的分类学界限变得模糊。本论文研究的目的是推断该群体的系统发育，以期了解其复杂的进化史。重点放在使用分子工具（例如PCR和DNA测序）来弄清它们的复杂关系。本课程的重要性包括但不限于：（1）出于学术原因更好地理解一个困难的分类单元，（2）积累数据以更好地理解这些分类单元，从而可以更好地关注保护工作（例如，P 。geniculata受联邦政府的威胁），（3）更好地理解具有经济重要性的一组植物之间的关系，（4）测试当前在植物分子系统学中使用的工具的极限-北美李子在边界上存在问题（5）增加了有关北美长期存在的生物地理问题的知识体系；该研究过程的结果表明：（1）非编码cpDNA区域之间存在可预测的速率异质性，并且几个最不常用的区域比最常用的区域为系统发育研究提供了更多的突变。 （2）北美李子是单生的。 （3）大多数北美李子类群的叶绿体是近缘和多系的---在北美李子类群的17个中的12个中，观察到三种主要的氯单倍型中的一种以上。 （4）就其核编码的s6pdh基因而言，大多数北美李子类群不是单系的-大多数类群共有三种主要的单倍型。这项调查提供的全部证据有力地证明了北美李子是同子游戏或杂交物种的假说。

著录项

  • 作者

    Shaw, Joey Thomas.;

  • 作者单位

    The University of Tennessee.;

  • 授予单位 The University of Tennessee.;
  • 学科 Biology Botany.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 201 p.
  • 总页数 201
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;
  • 关键词

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