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Brachypodium Cell Wall Mutant with Enhanced Saccharification Potential Despite Increased Lignin Content

机译:尽管木质素含量增加,但具有糖化潜力增强的Brachypodium细胞壁突变体

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摘要

Plant lignocellulosic biomass, mostly composed of cell walls, is one of the largest, mostly untapped, reserves of renewable carbon feedstock on the planet. Energy-rich polysaccharide polymers of plant cell walls can be broken down to produce fermentable sugars used to produce bioethanol. However, the complex structure of plant cell walls, and in particular, the presence of lignin, makes them recalcitrant to enzymatic degradation. Reducing this recalcitrance represents a major technological challenge. Brachypodium distachyon is an excellent model to identify parameters underlying biomass quality of energy grasses. In this work, we identified a mutant line spa1 with a so far undescribed phenotype combining brittleness with increased elasticity of the internodes. Mutant cell walls contain less crystalline cellulose and changes in hemicellulose and lignin quality and quantity. Using a dedicated reactor to follow in real-time, the evolution of straw particle size and sugar release during enzymatic digestion, we show that, despite the increased lignin content, the spa1 mutant has a dramatic reduced recalcitrance to saccharification compared to the WT. These observations demonstrate that other parameters besides lignin content are relevant for the improvement of biomass recalcitrance in energy grasses.
机译:植物木质纤维素生物质(主要由细胞壁组成)是地球上最大的,大部分尚未开发的可再生碳原料储藏之一。植物细胞壁的富含能量的多糖聚合物可以被分解以产生用于生产生物乙醇的可发酵糖。但是,植物细胞壁的复杂结构,特别是木质素的存在,使它们难以分解酶。降低这种顽固性是一项重大的技术挑战。短枝短曲霉是识别能量草生物量质量基础参数的优良模型。在这项工作中,我们确定了一个突变株spa1,其迄今为止尚未描述的表型结合了脆性和节间弹性的增加。突变细胞壁含有较少的结晶纤维素,并且半纤维素和木质素的质和量均发生变化。使用专用反应器实时跟踪酶消化过程中稻草粒径的变化和糖释放,我们显示,尽管木质素含量增加,但与WT相比,spa1突变体对糖化的抵抗力显着降低。这些观察结果表明,除了木质素含量外,其他参数也与提高能源草中生物量抗拒性有关。

著录项

  • 来源
    《Bioenergy research》 |2015年第1期|53-67|共15页
  • 作者单位

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    3.INRA UR1268 Biopolymers Interactions Assemblies 44316 Nantes France;

    3.INRA UR1268 Biopolymers Interactions Assemblies 44316 Nantes France;

    3.INRA UR1268 Biopolymers Interactions Assemblies 44316 Nantes France;

    3.INRA UR1268 Biopolymers Interactions Assemblies 44316 Nantes France;

    3.INRA UR1268 Biopolymers Interactions Assemblies 44316 Nantes France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    4.INRA UMR547 PIAF 63100 Clermont-Ferrand France 5.Clermont Université Université Blaise-Pascal UMR547 PIAF 63000 Clermont-Ferrand France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

    3.INRA UR1268 Biopolymers Interactions Assemblies 44316 Nantes France;

    1.INRA UMR1318 Institut Jean-Pierre Bourgin Saclay Plant Sciences 78000 Versailles France 2.AgroParisTech Institut Jean-Pierre Bourgin RD10 78000 Versailles France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Brachypodium Cell wall Cellulose Lignins Mutant Saccharification Biofuels;

    机译:Brachypodium细胞壁纤维素木质素突变糖化生物燃料;

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