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首页> 外文学位 >Effects of sodium chloride on growth and physiology of Pinus leiophylla seedlings.
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Effects of sodium chloride on growth and physiology of Pinus leiophylla seedlings.

机译：氯化钠对白叶松幼苗生长和生理的影响。

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摘要

Identification of salt- resistant tree species and genotypes is needed for rehabilitation of lands affected by salinity in Mexico. This dissertation consists of four studies for analyzing the responses of Pinus leiophylla seedlings to salt. In the first study, resistance to salt stress was studied in six-month-old seedlings from eight different sources of seed collected from the areas with contrasting precipitation levels. Plants from the xeric areas were shorter and had smaller stem diameters but were less sensitive to salt stress and recovered faster from salt injury compared with the plants from mesic sites, suggesting that morphological and physiological adaptations to drought were helpful with salt stress resistance. In the second study, fascicle needle production and tissue ion accumulation were examined in NaCl-treated three-month-old seedlings from two populations of the xeric origin and two populations from the mesic areas. Seedlings from the xeric population of San Felipe developed fewer fascicles and had shorter needles compared with seedlings from the remaining three populations. NaCl treatment delayed the emergence of fascicles and reduced the fascicle needle production and needle length. However, the extent of needle injury and ion accumulation in shoots were lower in the San Felipe seedlings compared with the other studied populations. In the third study, the effects of branch pruning and seedling size on total transpiration and accumulation of Na+ and Cl- in tissues were examined. Total plant transpiration, as affected by plant size and branch pruning, was correlated with Na+ and Cl- needle concentrations and needle necrosis. Branch pruning reduced ion accumulation in the shoots and needle necrosis levels in short seedlings but not in the tall seedlings. In the fourth study, sprouting and physiological responses of 16 month-old-seedling to salt were examined. NaCl treatment concentrations of 100, 150, and 200 mM reduced gas exchange and root hydraulic conductance, caused needle injury and triggered sprouting of adventitious shoots. Sprouting from the upper parts of the main stem and lateral branches was three times greater with 100 and 150 mM NaCl compared with 200 mM NaCl treatment but, at the base of the stem, sprout numbers were similar for all NaCl treatments.
机译：墨西哥受盐碱化影响的土地的恢复需要鉴定耐盐树种和基因型。本论文由四项研究组成，用于分析松叶樟幼苗对盐分的响应。在第一项研究中，研究了六个月大的幼苗的盐分抗性，这些幼苗来自八种不同种子来源，这些地区收集的降雨水平不同。与干旱地区的植株相比，干旱地区的植株较短，茎直径较小，但对盐胁迫的敏感性较低，并且从盐害中恢复得更快，表明形态和生理学适应干旱有助于抗盐胁迫。在第二项研究中，检查了来自两个旱生源种群和两个来自内陆地区种群的经NaCl处理的三个月大的幼苗的束状针产生和组织离子积累。与来自其余三个种群的幼苗相比，来自圣费利佩的干旱种群的幼苗形成的簇生较少，针具更短。 NaCl处理延迟了束的出现，并减少了束针的产生和针的长度。然而，与其他研究种群相比，San Felipe幼苗的针刺伤害和芽中离子积累的程度较低。在第三项研究中，研究了树枝修剪和幼苗大小对总蒸腾量以及组织中Na +和Cl-积累的影响。受植物大小和枝修剪影响的总植物蒸腾作用与Na +和Cl-针的浓度以及针坏死相关。修剪枝减少了短苗的芽和针坏死水平中的离子积累，但没有减少高苗中的离子积累。在第四项研究中，研究了16个月大的幼苗对盐的发芽和生理反应。 NaCl处理浓度分别为100、150和200 mM时，会减少气体交换和根系水力传导，导致针头受伤并引发不定芽。与200 mM NaCl处理相比，使用100和150 mM NaCl从主茎上部和侧枝的发芽要大三倍，但在茎的根部，所有NaCl处理的发芽数均相似。

著录项

  • 作者

    Jimenez-Casas, Marcos.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Agriculture Soil Science.;Biology Plant Physiology.;Natural Resource Management.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 217 p.
  • 总页数 217
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤学;植物学;
  • 关键词

  • 入库时间 2022-08-17 11:38:29

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