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首页> 外文期刊>Bioenergy research >Genetic Differentiation in Response to Selection for Water-Soluble Carbohydrate Content in Perennial Ryegrass (Lolium perenne L.)
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Genetic Differentiation in Response to Selection for Water-Soluble Carbohydrate Content in Perennial Ryegrass (Lolium perenne L.)

机译：多年生黑麦草中水溶性碳水化合物含量选择的遗传分化

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摘要

Plant carbohydrates are of increasing interest as renewable feedstocks to replace petrochemicals in the generation of fuels and production of high-value chemicals. Greater understanding of the genetic control of diversity in fructan synthesis and accumulation would facilitate more directed channelling of feedstock to process in a ryegrass biorefinery. Divergent populations produced by phenotypic selection for water-soluble carbohydrate content have been used to investigate relationships between traits, and to identify patterns of genetic differentiation which indicate genomic regions under high and low selection pressure. Selection for high water-soluble carbohydrate content was associated with increased synthesis of large fructan polymers and increased accumulation of above-ground plant biomass, particularly during spring. Three rounds of selection and two rounds of recombination resulted in widespread genetic differentiation across the whole genome, causing reduced allelic richness and increasing homozygosity at some loci. A smaller number of loci were shown to be subject to high selection pressure. Breeding material subjected to many years of selection for water-soluble carbohydrate also showed allelic differences which may reflect the consequences of high selection pressure at some of these same loci. However, some of the loci unaffected in the divergent selection experiment showed similar effects. This might arise from differences in linkage disequilibrium in these two sets of plant materials, but more likely from the different genetic background of the germplasm. This illustrates the complex nature of the water-soluble carbohydrate trait in perennial ryegrass.
机译：在生产燃料和生产高价值化学品中，植物碳水化合物作为可再生原料来代替石油化工产品受到越来越多的关注。对果聚糖合成和积累中的多样性的遗传控制的更多了解将有助于更直接地引导原料进入黑麦草生物炼油厂的加工过程。通过表型选择产生的水溶性碳水化合物含量不同的种群已用于研究性状之间的关系，并鉴定表明在高选择压力和低选择压力下基因组区域的遗传分化模式。高水溶性碳水化合物含量的选择与大果聚糖聚合物的合成增加以及地上植物生物量的积累增加有关，特别是在春季。三轮选择和两轮重组导致整个基因组发生广泛的遗传分化，从而导致等位基因富集度降低，某些基因座的纯合度增加。显示较少的基因座受到较高的选择压力。进行了多年选择的水溶性碳水化合物的育种材料也显示了等位基因差异，这可能反映了在这些相同基因座中某些基因选择压力较高的后果。但是，一些在发散选择实验中未受影响的基因座显示出相似的效果。这可能是由于这两套植物材料在连锁不平衡方面的差异所致，但更可能是由于种质的遗传背景不同所致。这说明多年生黑麦草中水溶性碳水化合物性状的复杂性质。

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  • 来源
    《Bioenergy research》 |2015年第1期|77-90|共14页
  • 作者

    J. A. Gallagher; L. B. Turner; A. J. Cairns; M. Farrell; J. A. Lovatt; K. Sk?t; I. P. Armstead; M. O. Humphreys; I. Roldan-Ruiz;

  • 作者单位

    1.Institute of Biological Environmental and Rural Sciences Aberystwyth University Gogerddan Aberystwyth Ceredigion SY23 3EE UK;

    1.Institute of Biological Environmental and Rural Sciences Aberystwyth University Gogerddan Aberystwyth Ceredigion SY23 3EE UK;

    1.Institute of Biological Environmental and Rural Sciences Aberystwyth University Gogerddan Aberystwyth Ceredigion SY23 3EE UK;

    1.Institute of Biological Environmental and Rural Sciences Aberystwyth University Gogerddan Aberystwyth Ceredigion SY23 3EE UK;

    1.Institute of Biological Environmental and Rural Sciences Aberystwyth University Gogerddan Aberystwyth Ceredigion SY23 3EE UK;

    1.Institute of Biological Environmental and Rural Sciences Aberystwyth University Gogerddan Aberystwyth Ceredigion SY23 3EE UK;

    1.Institute of Biological Environmental and Rural Sciences Aberystwyth University Gogerddan Aberystwyth Ceredigion SY23 3EE UK;

    1.Institute of Biological Environmental and Rural Sciences Aberystwyth University Gogerddan Aberystwyth Ceredigion SY23 3EE UK;

    2.Growth and Development Group Plant Sciences Unit Institute for Agricultural and Fisheries Research (ILVO) Melle Belgium;

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  • 关键词

    Allelic richness Biorefining Dry matter yield Fructan polymers SSR markers Sugars;

    机译：等位基因丰富度生物精制干物质产量果胶聚合物SSR标记糖;

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