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Cell Wall Diversity in Forage Maize: Genetic Complexity and Bioenergy Potential

机译:饲用玉米的细胞壁多样性:遗传复杂性和生物能源潜力

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摘要

Genetic studies are ideal platforms for assessing the extent of genetic diversity, inferring the genetic architecture, and evaluating complex trait interrelations for cell wall compositional and bioconversion traits relevant to bioenergy applications. Through the characterization of a forage maize doubled haploid (DH) population, we indicate the substantial degree of highly heritable (h2 > ~65 %) diversity in cell wall composition and bioconversion potential available within this important agronomic species. In addition to variation in lignin content, extensive genotypic diversity was found for the concentration and composition of hemicelluloses, the latter found to exert an influence on the recalcitrance of maize cell walls. Our results also demonstrate that forage maize harbors considerable variation for the release of cell wall glucose following pretreatment and enzymatic saccharification. In fact, the extent of variability observed for bioconversion efficiency (nearly 30 % between population extremes) greatly exceeded ranges reported in previous studies. In our population, a total of 52 quantitative trait loci (QTL) were detected for biomass compositional and bioconversion characters across 8 chromosomes. Noteworthy, from eight QTL related to bioconversion properties, five were previously unidentified and warrant further investigation. Ultimately, our results substantiate forage maize germplasm as a valid genetic resource for advancing cell wall degradability traits in bioenergy maize-breeding programs. However, since useful variation for cell wall traits is defined by QTL with “minor” effects (R2 = ~10 %), cultivar development for bio-based applications will rely on advanced marker-assisted selection procedures centered on detecting and increasing the frequency of favorable QTL alleles in elite flint and dent germplasm.
机译:遗传研究是评估遗传多样性程度,推断遗传结构以及评估与生物能源应用相关的细胞壁组成和生物转化性状的复杂性状相互关系的理想平台。通过对饲用玉米双单倍体(DH)种群的表征,我们表明了这种重要农艺物种中细胞壁组成和生物转化潜力的高度可遗传(h2>〜65%)多样性。除了木质素含量的变化外,还发现半纤维素的浓度和组成具有广泛的基因型多样性,后者对玉米细胞壁的拒钙性有影响。我们的结果还表明,饲用玉米具有预处理和酶促糖化作用后释放细胞壁葡萄糖的显着差异。实际上,观察到的生物转化效率的变异程度(在极端人群之间接近30%)大大超出了先前研究报告的范围。在我们的种群中,共检测到52个定量性状基因座(QTL),它们涵盖8条染色体上的生物量组成和生物转化特征。值得注意的是,在八个与生物转化特性相关的QTL中,有五个以前未被发现,需要进一步研究。最终,我们的研究结果证实了饲用玉米种质是在生物能源玉米育种计划中推进细胞壁可降解性状的有效遗传资源。但是,由于QTL定义了细胞壁性状的有用变异,具有“轻微”效应(R2 =〜10%),因此基于生物的应用的品种开发将依赖于以标记为辅助的选择程序,该程序以检测和增加频率为中心优良的QTL等位基因在优良的fl石和凹痕种质中。

著录项

  • 来源
    《Bioenergy research》 |2015年第1期|187-202|共16页
  • 作者单位

    1.Wageningen UR Plant Breeding Wageningen University and Research Centre P.O. Box 386 6700 AJ Wageningen The Netherlands 2.Graduate School Experimental Plant Sciences Wageningen University Wageningen The Netherlands;

    3.Limagrain Nederland B.V. Rilland The Netherlands;

    1.Wageningen UR Plant Breeding Wageningen University and Research Centre P.O. Box 386 6700 AJ Wageningen The Netherlands;

    1.Wageningen UR Plant Breeding Wageningen University and Research Centre P.O. Box 386 6700 AJ Wageningen The Netherlands 2.Graduate School Experimental Plant Sciences Wageningen University Wageningen The Netherlands;

    4.Limagrain France S.A. Clermont-Ferrand France;

    4.Limagrain France S.A. Clermont-Ferrand France;

    3.Limagrain Nederland B.V. Rilland The Netherlands;

    1.Wageningen UR Plant Breeding Wageningen University and Research Centre P.O. Box 386 6700 AJ Wageningen The Netherlands;

    1.Wageningen UR Plant Breeding Wageningen University and Research Centre P.O. Box 386 6700 AJ Wageningen The Netherlands;

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

    Maize Cell wall composition QTL Biofuel Pretreatment Saccharification;

    机译:玉米细胞壁组成QTL生物燃料预处理糖化;

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