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Root anatomical mechanisms involved in host plant control of arbuscular mycorrhizal colonization.

机译：根系解剖机制参与宿主植物对丛枝菌根定植的控制。

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摘要

Mycorrhizal host plants are widely known to be capable of controlling the degree to which their root systems are colonized by arbuscular mycorrhizal fungi. Previous studies to elucidate mechanisms involved in host plant control of colonization have not considered root anatomical changes as potential control mechanisms. Here, I examined three root anatomical variables hypothesized to influence mycorrhizal colonization: the percentage of root length with a suberized hypodermis, the distribution of hypodermal passage cells, and the percentage of root volume as intercellular air space.;To test whether changes in these root anatomical variables influence mycorrhizal colonization, interspecific variation in each trait was correlated with mycorrhizal colonization in a diverse assortment of plant species. Hypodermal passage cell distribution was the only variable capable of influencing mycorrhizal colonization via its effect on fungal penetration point formation. Mycorrhizal colonization was not found to be significantly influenced by either the percentage of root length suberized or the percentage of root volume as intercellular air space.;Next, I evaluated the effect of P treatment on each of these variables in order to explore whether they might be potential mechanisms involved in phosphorus-mediated control of mycorrhizal colonization. Fifteen species from 13 families were grown at two P availabilities, and the effect of plant P concentration on each variable was assessed. When each plant species was analyzed as a replicate, only the distribution of passage cells was significantly affected by P status; high P plants possessed a reduced percentage of root length with passage cells. Other examined traits did not respond significantly to P status, and individual species responses to P treatment varied widely. I conclude that, while no single anatomical mechanism appears to be responsible in all species, in species with passage cells, altering the percentage of root length with passage cells could serve as one mechanism for P-mediated control of mycorrhizal colonization.
机译：众所周知，菌根寄主植物能够控制其根系被丛枝菌根真菌定殖的程度。阐明宿主植物定植控制机制的先前研究并未将根部解剖学变化视为潜在的控制机制。在这里，我检查了被认为会影响菌根定植的三个根部解剖变量：皮下层皮下组织的根长百分比，皮下传代细胞的分布以及作为细胞间空隙的根部体积百分比。解剖学变量影响菌根定殖，每种性状的种间变异与植物种类多样的菌根定殖相关。次生皮细胞的分布是唯一能够通过其对真菌穿透点形成的影响来影响菌根定植的变量。没发现根腐病的根长百分比或根际体积百分比（作为细胞间空隙）对菌根定植没有显着影响。接下来，我评估了P处理对这些变量中每个变量的影响，以探讨它们是否可能是参与磷介导的菌根定植控制的潜在机制。来自13个科的15个物种以2种P的利用率生长，并评估了植物P浓度对每个变量的影响。当以复制品分析每种植物时，磷状态仅显着影响传代细胞的分布。高P植物的传代细胞具有降低的根长百分比。其他检查的性状对磷的状况没有明显的反应，个体对磷处理的反应差异很大。我的结论是，虽然似乎没有一个解剖学机制负责所有物种，但在具有传代细胞的物种中，通过传代细胞改变根长百分比可以作为P介导的菌根定殖控制的一种机制。

著录项

  • 作者

    Sharda, Jori N.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Biology Botany.
  • 学位 Ph.D.
  • 年度 2009
  • 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

  • 入库时间 2022-08-17 11:38:19

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