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首页> 外文学位 >Role of arbuscular mycorrhizal fungus (Glomus intraradices Schenck and Smith) colonization in drought tolerance of maize (Zea mays L.).
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Role of arbuscular mycorrhizal fungus (Glomus intraradices Schenck and Smith) colonization in drought tolerance of maize (Zea mays L.).

机译：丛枝菌根真菌（Glomus intraradices Schenck和Smith）定殖在玉米（Zea mays L.）的耐旱性中的作用。

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摘要

The purpose of this thesis was to study the potential factors involved in mycorrhizae-assisted drought tolerance in maize (Zea mays L.). We hypothesized that the AM colonization promotes drought tolerance of the host plant. This may be as a consequence of altered water relations, metabolism or nutritional status of the host plant. These changes enable the host plant to sustain water deficit conditions and recover more rapidly when irrigation is restored. To test these hypotheses, the five objectives were: (i) To measure the physiological responses in maize plants in the absence or presence of AM colonization; (ii) To examine the metabolic changes in these plants; (iii) To determine the host plant nutritional status in order to assess the ability of AM plants to support kernel development; (iv) To evaluate the drought recovery of maize and (v) To examine the effects of AM colonization on nitrogen assimilation in maize as a potential factor in drought tolerance.;The AM colonization in maize had a beneficial effect on the water relations and leaf enlargement under water deficit conditions. In comparison to non-AM plants, the AM colonized plants maintained higher (less negative) leaf water potential (LWP) and lower stomatal resistance even after 3 wks of withholding water at the tasselling stage.;Mycorrhizal colonization improved the nutritional status of maize through the enhanced uptake of N, P and other micronutrients. This indirectly helps the AM plants to utilize the soil available moisture more effectively. Our data indicated that the total N content in drought-stressed maize plants were nearly doubled in the presence of AM association.;The overall results support the hypothesis that the AM colonization assists the two tropical maize cultivars to withstand under moderate drought conditions. The drought tolerance was achieved due to the physiological, metabolic and nutritional modifications in the host plant. These changes can be primarily related to the improved host plant water relations and the nutritional status, especially N and P. This thesis has provided new insights into the changes in N acquisition and assimilation of mycorrhizal plants under drought conditions. The findings of this thesis support the idea that AM fungi are one of the major biological components in the rhizosphere needed to accomplish the goal of sustainable agriculture in arid and semiarid areas. (Abstract shortened by UMI.)
机译：本文的目的是研究玉米菌根辅助耐旱性的潜在影响因素。我们假设AM移殖促进宿主植物的耐旱性。这可能是宿主植物水分关系，新陈代谢或营养状况发生变化的结果。这些变化使寄主植物能够维持缺水状况，并在恢复灌溉后更快地恢复。为了检验这些假设，五个目标是：（i）在不存在或不存在AM菌落的情况下，测量玉米植株的生理反应； （ii）检查这些植物的代谢变化； （iii）确定寄主植物的营养状况，以评估增材制造植物支持籽粒发育的能力； （iv）评估玉米的干旱恢复能力;（v）研究AM菌落对玉米中氮吸收的影响，作为抗旱性的潜在因素;;玉米AM菌落对水分关系和叶片有有益的影响在缺水条件下扩大。与非AM植物相比，AM定植的植物即使在抽穗期扣留水分3周后仍保持较高的（较少的负）叶水势（LWP）和较低的气孔抗性。菌根定植通过以下方式改善了玉米的营养状况：氮，磷和其他微量营养素的吸收增加。这间接地帮助AM植物更有效地利用土壤中的水分。我们的数据表明，在存在AM关联的情况下，干旱胁迫的玉米植株中的总氮含量几乎增加了一倍。总体结果支持以下假设：AM定植有助于两个热带玉米品种在中等干旱条件下耐受。由于宿主植物的生理，代谢和营养方面的改变，因此达到了耐旱性。这些变化可能主要与改善寄主植物水分关系和营养状况，尤其是氮和磷有关。本论文为干旱条件下菌根植物氮素吸收和同化的变化提供了新的见解。本论文的发现支持了AM真菌是在干旱和半干旱地区实现可持续农业目标所需的根际中主要的生物成分之一的观点。 （摘要由UMI缩短。）

著录项

  • 作者

    Subramanian, Kizhaeral S.;

  • 作者单位

    University of Ottawa (Canada).;

  • 授予单位 University of Ottawa (Canada).;
  • 学科 Agriculture Agronomy.;Biology Botany.;Biology Ecology.;Agriculture Plant Culture.;Biology Plant Physiology.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 198 p.
  • 总页数 198
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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