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首页> 外文学位 >The effects of increased syringyl to guaiacyl lignin monomer ratios on xylem hydraulic properties in hybrid poplar (Populus tremula x P. alba).
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The effects of increased syringyl to guaiacyl lignin monomer ratios on xylem hydraulic properties in hybrid poplar (Populus tremula x P. alba).

机译：丁香基/愈创木基木质素单体比例的增加对杂种杨（Populus tremula x P. alba）木质部水力特性的影响。

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摘要

The goal of this research was to examine how changes in the syringyl to guaiacyl (S:G) lignin monomer ratio will affect the conductive efficiency and resistance to embolism in hybrid poplar. I used two lines of hybrid poplar clone 717 (Populus tremula x P. alba) over-expressing the Arabidopsis gene encoding ferulate-5-hydroxylase (F5H) which resulted in an increased S:G ratio in xylem tissue. The two lines selected for use, F5H37 and F5H64, expressed 88% and 94% syringyl, respectively, compared to 66% syringyl expressed in wild type (WT) plants. To quantify the effects of increased S:G on hydraulic properties, two studies were performed. First, the hydraulic conductivity and resistance to embolism of F5H and wt lines were tested under well watered and water stress conditions. The goal of the second experiment was to examine the response of the F5H and WT lines to winter freeze-thaw stress and spring recovery. Results from this research show that increasing S:G has no significant effect on the hydraulic conductivity of xylem, but lines with increased S:G were observed to be more vulnerable to cavitation. Data for pressure at 75% embolism (P75) showed that F5H64 was approximately 75% more vulnerable to cavitation and in 2009 F5H37 was twice as vulnerable to cavitation as the WT. No significant differences were found between lines in response to drought and winter freeze-thaw stress.
机译：这项研究的目的是研究丁香基与愈创木基（S：G）木质素单体比例的变化如何影响杂种杨的导电效率和抗栓塞性。我使用了两系杂交杨树克隆717（Populus tremula x P. alba），它们过度表达编码阿魏酸5-羟化酶（F5H）的拟南芥基因，导致木质部组织中S：G比率增加。选择使用的两个品系F5H37和F5H64分别表达88％和94％的丁香基，而野生型（WT）植物中表达的66％丁香基。为了量化增加的S：G对水硬性的影响，进行了两项研究。首先，在浇水和水分胁迫条件下测试了F5H和wt线的水力传导率和抗栓塞性。第二个实验的目的是检验F5H和WT品系对冬季冻融应力和春季恢复的响应。这项研究的结果表明，增加S：G对木质部的水力传导率没有显着影响，但是观察到S：G增加的线更容易发生空化。栓塞率为75％（P75）时的压力数据显示，F5H64的空化脆弱性大约高75％，2009年F5H37的空化脆弱性是WT的两倍。在干旱和冬季冻融胁迫下，品系之间没有发现显着差异。

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  • 作者

    Pierce, Jeffrey Arnold.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Agriculture Plant Culture.
  • 学位 M.S.
  • 年度 2012
  • 页码 73 p.
  • 总页数 73
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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