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首页> 外文期刊>Bioenergy research >Colocalizations Between Several QTLs for Cell Wall Degradability and Composition in the F288 × F271 Early Maize RIL Progeny Raise the Question of the Nature of the Possible Underlying Determinants and Breeding Targets for Biofuel Capacity
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Colocalizations Between Several QTLs for Cell Wall Degradability and Composition in the F288 × F271 Early Maize RIL Progeny Raise the Question of the Nature of the Possible Underlying Determinants and Breeding Targets for Biofuel Capacity

机译：F288×F271早期玉米RIL后代中细胞壁可降解性和组成的几个QTL的共定位引发了潜在的决定因素和生物燃料能力育种目标的性质问题

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摘要

Understanding the genetic basis of the different traits which contribute to a given value of cell wall degradability is a key issue towards the breeding of grasses with higher feeding value or higher capability for bioenergy production. A quantitative trait loci (QTL) investigation for cell wall degradability and several cell wall component traits including lignin content, p-hydroxycinnamic acid content, and lignin monomeric structure was thus done with a simultaneous search for underlying candidate genes in the F288 × F271 recombinant inbred line progeny. Genotype effects were highly significant for all cell wall investigated traits (P < 0.001) and much higher than genotype × environment interaction effects. Out of 42 QTLs mapped, 11 and 23 QTLs explained more than 20 and 15 % of the observed trait phenotypic variation, respectively. Twenty-three QTLs were gathered into four large clusters shown in bins 3.06, 4.09, 6.05, and 6.07. Colocalizations of cell wall degradability QTLs occurred with lignin content QTLs and lignin structure QTLs. Moreover, for two positions, there were also colocalizations with etherified ferulic acid QTLs. Such simultaneous colocalizations between QTLs for cell wall degradability and both lignin- and ferulate-related traits led to questioning the possible underlying genetic determinant(s). A cluster of (linked) genes involved in the different mechanisms of cell wall biosynthesis and/or assembly is likely the simplest situation to consider. However, a single “master” regulation factor located upstream in the pathway of cell wall biosynthesis and assembly cannot be definitely ruled out. Candidate genes putatively involved in cell wall degradability variations highlighted especially the presence of ZmMYB Hv5/EgMYB1-like and COV-like genes in any of the clusters. Moreover, besides potential regulatory candidates, there are a number of candidates of still unknown functions. The question of the nature of the possible QTL underlying determinants is still partly unanswered, even if the results obtained strongly suggested that, in this progeny, genes involved in monolignol biosynthesis and important Arabidopsis NAC are not likely candidates. In addition, the positions of candidate genes suggested that ghost QTL positions should also be considered.
机译：了解不同性状的遗传基础有助于给定的细胞壁降解值，这是培育具有较高饲喂价值或具有更高生物能源生产能力的草的关键问题。因此，对F288×F271重组自交系中的潜在候选基因进行了同步搜索，从而对细胞壁降解性和包括木质素含量，对羟基肉桂酸含量和木质素单体结构在内的多个细胞壁成分性状进行了数量性状基因座研究。系后代。基因型效应对于所有细胞壁调查性状均具有极高的显着性（P <0.001），远高于基因型×环境相互作用效应。在映射的42个QTL中，有11个和23个QTL分别解释了所观察到的性状表型变异的20％和15％以上。将23个QTL收集到四个大型群集中，分别显示在bin 3.06、4.09、6.05和6.07中。细胞壁降解性QTL与木质素含量QTL和木质素结构QTL共定位。此外，对于两个位置，还存在与醚化阿魏酸QTL的共定位。用于细胞壁降解的QTL与木质素和阿魏酸相关性状之间的这种同时共定位导致对可能的潜在遗传决定因素的质疑。涉及细胞壁生物合成和/或装配的不同机制的（连锁）基因簇可能是最容易考虑的情况。但是，不能明确排除位于细胞壁生物合成和组装途径上游的单个“主要”调节因子。推测参与细胞壁降解性变异的候选基因突出显示了在任何簇中都存在ZmMYB Hv5 / EgMYB1样和COV样基因。此外，除了潜在的监管候选人之外，还有许多职能仍未知的候选人。即使可能获得的结果强烈表明，在此后代中，涉及单木酚生物合成和重要拟南芥NAC的基因也不太可能解决，但仍无法部分回答潜在QTL决定因素的性质问题。另外，候选基因的位置提示还应考虑鬼QTL位置。

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  • 来源
    《Bioenergy research》 |2014年第1期|142-156|共15页
  • 作者

    Audrey Courtial; Valérie Méchin; Matthieu Reymond; Jacqueline Grima-Pettenati; Yves Barrière;

  • 作者单位

    1.INRA Unité de Génétique et d’Amélioration des Plantes Fourragères 86600 Lusignan France 2.Université de Toulouse UPS UMR 5546 Laboratoire de Recherche en Sciences Végétales BP 42617 Auzeville 31326 Castanet-Tolosan France 3.CNRS UMR 5546 BP 42617 31326 Castanet-Tolosan France;

    4.INRA Institut Jean-Pierre Bourgin 78026 Versailles France;

    4.INRA Institut Jean-Pierre Bourgin 78026 Versailles France;

    2.Université de Toulouse UPS UMR 5546 Laboratoire de Recherche en Sciences Végétales BP 42617 Auzeville 31326 Castanet-Tolosan France 3.CNRS UMR 5546 BP 42617 31326 Castanet-Tolosan France;

    1.INRA Unité de Génétique et d’Amélioration des Plantes Fourragères 86600 Lusignan France;

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  • 正文语种 eng
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  • 关键词

    Maize Degradability Lignin p-Hydroxycinnamic acid Cell wall QTL;

    机译：玉米降解性木质素对羟基肉桂酸细胞壁QTL;

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