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首页> 外文学位 >Association Mapping Analysis of a Core Collection of Flax ( Linum usitatissimum L.).
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Association Mapping Analysis of a Core Collection of Flax ( Linum usitatissimum L.).

机译：亚麻（亚麻）的核心品种的关联图分析。

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摘要

Linseed oil (Linum usitatissimum L.) is valued for its food and non-food applications. Although Canada is the world's largest linseed producer and exporter, linseed remains a minor crop in part because its yield has been stagnating over the last decade compared to other oilseeds. Narrow genetic base, absence of an efficient hybrid production system and limited genomic tools for linseed breeding are the main factors hindering yield and quality improvements. Here, we characterized the Canadian flax core collection of 407 accessions with 448 genome-wide simple sequence repeat markers and, using association mapping (AM), we demonstrated its potential for the improvement of seed quality and agronomic traits.;AM for seven seed quality traits including oil content (OIL), palmitic acid (PAL), stearic acid (STE), oleic acid (OLE), linoleic acid (LIO), linolenic acid (LIN) and iodine value (IOD) identified nine stable candidate QTL. LIO and LIN QTL co-localized with previously identified QTL and some mapped in the vicinity of genes known to be involved in the fatty acid biosynthesis pathway.;AM conducted for nine agronomic traits including yield, bolls per area (BPA), seeds per boll (SPB), thousand seed weight (TSW), start of flowering (FL5%), end of flowering (FL95%), plant height (PH), plant branching (PB) and lodging (LDG) identified twelve significant marker-trait associations for six of the traits. The associated markers explained between 0.5 to 18.5% of the phenotypic variation, with Lu526 and Lu2532 associated with TSW and Lu943 associated with flowering being the most promising for marker-assisted selection. Statistical simulation for five markers associated with TSW indicated that the favorable alleles have additive effects. None of the accessions carried the five favorable alleles but a few breeding lines had four, indicating that further improvement of TSW and yield could be achieved through marker assisted breeding.;Genetic structure analyses assigned all accessions to two major groups that were weakly differentiated (FST = 0.094). Genetic diversity was abundant in the total panel (5.32 alleles per locus) with weak familial relatedness (mean = 0.287) for most individual pairs. Linkage disequilibrium (LD) decayed relatively quickly with an average genome-wide LD of ∼1 cM.
机译：亚麻籽油（Linum usitatissimum L.）因其在食品和非食品领域的应用而受到重视。尽管加拿大是世界上最大的亚麻籽生产国和出口国，但亚麻籽仍是次要作物，部分原因是与其他油籽相比，过去十年来亚麻籽的产量一直停滞不前。狭窄的遗传基础，缺乏有效的杂交生产系统以及有限的亚麻籽育种基因组工具是阻碍产量和质量提高的主要因素。在这里，我们用448个全基因组简单序列重复标记对407个种质的加拿大亚麻核心种质进行了鉴定，并使用关联图谱（AM）证明了其改善种子品质和农艺性状的潜力。包括油含量（OIL），棕榈酸（PAL），硬脂酸（STE），油酸（OLE），亚油酸（LIO），亚麻酸（LIN）和碘值（IOD）在内的9个稳定候选QTL。 LIO和LIN QTL与先前鉴定的QTL共同定位，并且一些定位在已知与脂肪酸生物合成途径有关的基因附近.AM对9个农艺性状进行了研究，包括产量，单位面积铃（BPA），每铃种子（SPB），千粒重（TSW），开花开始（FL5％），开花结束（FL95％），株高（PH），植物分枝（PB）和倒伏（LDG）确定了十二种显着的标记性状关联对于六个特征。相关标记解释了表型变异的0.5％至18.5％，其中与TSW相关的Lu526和Lu2532和与开花相关的Lu943是最有希望的标记辅助选择。与TSW相关的五个标记的统计模拟表明，有利的等位基因具有累加效应。所有的种质都没有携带5个有利的等位基因，但有几个育种系具有4个等位基因，这表明通过标记辅助育种可以实现TSW和产量的进一步提高。 = 0.094）。总体多样性（每个位点5.32个等位基因）具有丰富的遗传多样性，而大多数个体对的家族亲缘关系较弱（平均值= 0.287）。连锁不平衡（LD）衰减相对较快，平均全基因组LD约为1 cM。

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  • 作者

    Soto-Cerda, Braulio.;

  • 作者单位

    University of Manitoba (Canada).;

  • 授予单位 University of Manitoba (Canada).;
  • 学科 Agriculture Agronomy.;Agriculture General.;Agriculture Plant Culture.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 277 p.
  • 总页数 277
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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