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首页> 外文学位 >Genetic and temporal variation in resource exchange between an ectomycorrhizal fungus, Rhizopogon occidentalis, and seedlings of Pinus radiata.
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Genetic and temporal variation in resource exchange between an ectomycorrhizal fungus, Rhizopogon occidentalis, and seedlings of Pinus radiata.

机译：外生菌根真菌，根瘤菌和辐射松幼苗之间资源交换的遗传和时间变化。

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摘要

Various economic theories have been adapted to explain the evolutionary persistence of resource exchange mutualisms such as mycorrhizae. The ratio of resources exchanged is an important variable common to all these models. Measuring resource exchange ratios is the first step in testing the hypotheses predicted by these models and will provide insight into resource dynamics of mutualisms. We examined how the carbon, nitrogen and phosphorus resource exchange dynamics between Pinus radiata and an ectomycorrhizal fungus, Rhizopogon occidentalis, varied between native populations of Pinus radiata and over the first 64 weeks of the mycorrhizal mutualism. Using a mycocosm approach, the C:N and C:P exchange ratios were determined by comparing the amount of C respired by fungi and C assimilated in fungal biomass to the amount of N and P assimilated in plant tissues over a time period. Resource exchange was assessed at 8, 16, 32, and 64 weeks after inoculation for two Pinus radiata native populations. Resource exchange increased over time during the development of the mycorrhizal mutualism. Pine seedlings from the Cambria population transferred greater amounts of carbon to the ectomycorrhizal fungus, with the majority of this carbon being respired by fungal biomass. The ratio of resources exchanged did not vary over time or between pine populations, pointing to total resource fluxes as the potential mechanism behind changes in mycorrhizal fungal compatibility between populations of host plants.
机译：各种经济学理论已经被用来解释资源交换共生主义（例如菌根）的进化持续性。交换资源的比率是所有这些模型共有的重要变量。测量资源交换率是检验这些模型所预测的假设的第一步，并将提供对共生关系的资源动态的洞察力。我们研究了辐射松和一种外生菌根真菌根际真菌（Rhizopogon occidentalis）之间的碳，氮和磷资源交换动态如何在辐射松的原生种群之间以及菌根互生的前64周之间变化。使用霉菌病方法，通过比较一段时间内真菌吸收的C和真菌生物质中C的吸收量与植物组织中N和P的吸收量，确定C：N和C：P交换比。在两个辐射松原生种群接种后第8、16、32和64周评估了资源交换。随着菌根互助性的发展，资源交换随着时间的推移而增加。来自坎布里亚（Cambria）种群的松树苗将更多的碳转移到外生菌根真菌中，其中大部分碳通过真菌生物质呼吸。交换的资源比例没有随时间变化或在松树种群之间变化，这表明总的资源通量是寄主植物种群之间菌根真菌相容性变化背后的潜在机制。

著录项

  • 作者

    Meachum, Mariah K.;

  • 作者单位

    The University of Mississippi.;

  • 授予单位 The University of Mississippi.;
  • 学科 Ecology.;Botany.;Evolution development.
  • 学位 M.S.
  • 年度 2016
  • 页码 59 p.
  • 总页数 59
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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