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首页> 外文学位 >Genetic lineages of an obligate mycobiont associated with the mycoheterotrophic plant, Pterospora andromedea, in the south-central Rocky Mountains.
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Genetic lineages of an obligate mycobiont associated with the mycoheterotrophic plant, Pterospora andromedea, in the south-central Rocky Mountains.

机译：与落基山脉中南部的异养异养植物Pterospora andromedea有关的专性真菌生物的遗传谱系。

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摘要

Mycoheterotrophic plants are nonphotosynthetic and require the formation of a tripartite relationship with an autotrophic host and a mutualistic fungus to acquire carbon. To date, no study has inferred the population biology of any mycobiont in a tripartite system using ectomycorrhizal tissue from these symbioses. In this study, the genetic structure of Rhizopogon salebrosus, a mycobiont associated with Pterospora andromedea in the south-central Rocky Mountains, is reported. Ectomycorrhizae, containing both fungal and plant tissue, were collected from root balls of Pterospora andromedea. Mycobiont identification was accomplished using the ITS locus and sequences from Rhizopogon section Amylopogon found on GenBank. The genetic structure of the mycobiont was examined using phylogenetic analyses of two rDNA loci, ITS and RPB2, from 97 samples. Although P. andromedea has been found to associate with at least three Rhizopogon species throughout its range in North America, it was found to exclusively associate with the R. salebrosus species in the Rocky Mountains. The data support the presence of two genetic lineages within the R. salebrosus species group which exhibit a north-south distribution, possibly linked to historic conifer association. A potential zone of secondary contact between the two lineages was also identified and may reflect a zone of hybridization.
机译：异养真菌是非光合植物，需要与自养宿主和互生真菌形成三方关系才能获得碳。迄今为止，尚无研究使用来自这些共生体的外生菌根组织来推断三方系统中任何真菌生物体的种群生物学。在这项研究中，据报道，落基山脉中南部的根瘤菌（Rhozopogon salebrosus）的一种遗传结构是一种与翼龙（Pterospora andromedea）相关的真菌。从蕨类和蕨类植物的根球中收集含有真菌和植物组织的外生菌根。使用ITS基因座和GenBank上发现的根瘤菌节淀粉样芽孢杆菌的序列完成了对真菌的鉴定。使用来自97个样本的两个rDNA基因座ITS和RPB2的系统发育分析，检查了真菌生物的遗传结构。尽管在北美范围内发现仙女疫病菌与至少三个根瘤菌属有关，但发现它仅与落基山脉的sale虫属有关。数据支持在R. salebrosus物种组内存在两个遗传谱系，它们显示出南北分布，可能与历史针叶树协会有关。还确定了两个谱系之间的二次接触的潜在区域，并且可能反映了杂交区域。

著录项

  • 作者

    Dowie, Nicholas J.;

  • 作者单位

    University of Wyoming.;

  • 授予单位 University of Wyoming.;
  • 学科 Biology Botany.
  • 学位 M.S.
  • 年度 2010
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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