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首页> 外文学位 >Genetic variation and hybridization among red oaks of California: A case study of Quercus parvula, Quercus wislizeni and Quercus kelloggii.
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Genetic variation and hybridization among red oaks of California: A case study of Quercus parvula, Quercus wislizeni and Quercus kelloggii.

机译：加利福尼亚州红橡树的遗传变异和杂交：以小栎，小栎和凯氏栎为例。

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摘要

Quercus wislizenii and Q. parvula are evergreen oaks of California. The latter was recognized as a species distinct from Q. wislizenii only recently, but has not received full acceptance. In an attempt to study differentiation between these two taxa and the genetic architecture of their populations, a molecular genetic analysis was carried out using Amplified Fragment Length Polymorphism (AFLP) markers. This study examined patterns of genetic variation among Q. wislizenii and Q. parvula and other red oaks (Q. agrifolia and Q. wislizenii) in California as well as molecular evidence of hybridization.; Although species specific markers were observed between Q. kelloggii and other members of the red oak group in California, fixed genetic differences were not apparent among Q. agrifolia, Q. parvula and Q. wislizenii. Genetic differentiation between Q. wislizenii and Q. parvula was low (phi ct = 0.013, P = 0.09) and neither UPGMA cluster analysis nor principal coordinates analysis revealed any clear separation of the taxa.; Genetic variability within populations of Q. parvula and Q. wislizenii was high with mean percent polymorphic loci of 56. Most of the genetic variability was within populations (81%, P 0.001) compared to 18% and 1.23% among populations within each species and between species respectively.; Low genetic differentiation betweenQ. parvula and Q. wislizenii could be due in part to the relatively short time since divergence and rapid radiation of these species. In addition, repeated hybridization between Q. parvula and Q. wislizenii and between these species and other red oaks of California could have caused convergence of the characters.; Species-specific AFLP markers clearly showed intermediacy of field identified hybrids between Q. wislizenii and Q. kelloggii. Their hybrid status was further supported by intermediacy in principal coordinates analysis. The data suggest differential interspecific gene flow in the direction of Q. kelloggii to Q. wislizenii.
机译：栎（Quercus wislizenii）和Q. parvula是加利福尼亚的常绿橡树。后者直到最近才被确认为不同于威斯康辛Q.的物种，但尚未得到完全的接受。为了研究这两个分类群及其种群的遗传结构之间的差异，使用扩增片段长度多态性（AFLP）标记进行了分子遗传分析。这项研究检查了加利福尼亚州的威斯康星栎和小叶栎以及其他红橡（Q. agrifolia和Q. wislizenii）之间的遗传变异模式以及杂交的分子证据。尽管在加利福尼亚州的凯洛格氏菌和赤栎群的其他成员之间观察到了物种特异性标记，但在农杆菌Q. parvula和Q. wislizenii之间没有固定的遗传差异。 wislizenii和Q. parvula之间的遗传分化很低（phi ct = 0.013，P = 0.09），UPGMA聚类分析和主坐标分析均未清楚分类。小Q.wislizenii和Q.wislizenii种群的遗传变异性很高，平均多态性位点为56。大多数遗传变异性在种群内（81％，P <0.001），而每个物种的种群间的遗传变异性分别为18％和1.23％和物种之间。 Q之间的遗传分化低。 parvula和Q.wislizenii可能部分归因于这些物种的散布和快速辐射以来相对较短的时间。另外，在小Q. wislizenii和Q. wislizenii之间以及这些物种与加利福尼亚的其他红橡树之间反复杂交可能会导致这些字符的融合。物种特有的AFLP标记清楚地表明了在野外发现的Q.wislizenii和Q.kelloggii之间杂种的中间性。它们的混合状态在主坐标分析中得到中介的进一步支持。数据表明，不同种间基因流向凯洛格氏菌到维氏梭菌。

著录项

  • 作者

    Haghighat-Kashani, Mohammad Nasser.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Biology Botany.; Biology Genetics.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 95 p.
  • 总页数 95
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;遗传学;
  • 关键词

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