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MECHANICAL PROPERTIES OF GENETICALLY ENGINEERED YOUNG ASPEN WITH MODIFIED LIGNIN CONTENT AND/ORSTRUCTURE

机译:具有修饰的木质素含量和/或结构的遗传工程化的年轻面筋的力学性能

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Reducing lignin content is a target for processes such as papermaking because lignin removal requires a tremendous amount of energy and chemicals. Recent advances in tree genetics permit modification of lignin content and structure. The consequences of lignin modifications on many wood properties are not known. The purpose of this study was to establish the effect of genetic modification of lignin on selected wood mechanical properties. In this study, genetically modified young quaking aspen trees with reduced lignin content and/or increased syringyl to guaiacyl (S/G) ratio were investigated and compared with the wild type. The modulus of elasticity in three-point bending and the compression strength parallel to the grain were measured using modified micromechanical tests. The results indicate that the genetic modification used in this study had a negative effect on these mechanical properties. The transgenic trees with reduced lignin content showed a severe reduction in modulus of elasticity and compression strength parallel to the grain, whereas the transgenic trees with increased S/G ratio had only a slight decrease in these properties compared with the wild type. The simultaneous modification of lignin content and S/G ratio shows inconsistentresults and needs further investigation.
机译:降低木质素含量是造纸等过程的目标,因为去除木质素需要大量的能量和化学物质。树木遗传学的最新进展允许木质素含量和结构的改变。木质素修饰对许多木材性能的影响尚不清楚。这项研究的目的是确定木质素的基因修饰对所选木材力学性能的影响。在这项研究中,调查了具有降低的木质素含量和/或增加的丁香基对愈创木脂(S / G)比率的转基因幼木白杨树,并将其与野生型进行了比较。使用改进的微机械测试,测量了三点弯曲的弹性模量和平行于晶粒的压缩强度。结果表明,本研究中使用的遗传修饰对这些机械性能具有负面影响。具有降低的木质素含量的转基因树显示出与谷物平行的弹性模量和抗压强度的严重降低,而具有提高的S / G比的转基因树与野生型相比仅具有轻微的降低。木质素含量和S / G比的同时改变显示不一致的结果,需要进一步研究。

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