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首页> 外文学位 >Mapping QTL conferring resistance to fusarium head blight in the spring wheat cultivar 'UI Stone'.
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Mapping QTL conferring resistance to fusarium head blight in the spring wheat cultivar 'UI Stone'.

机译：绘制QTL图谱，赋予春小麦品种'UI Stone'对镰刀菌枯萎病的抗性。

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摘要

Fusarium head blight (FHB) is one of the most destructive diseases of wheat causing significant yield losses and quality reduction in the humid areas of the world. It is also an emerging wheat disease in Southeastern Idaho of the United States. Resistance to FHB is known to be a quantitatively inherited trait and highly influenced by confounding environmental factors. The objectives of this study were to map and characterize QTL associated with FHB resistance in 151 (F4:6) recombinant inbred lines (RILs) derived from the cross between a resistant cultivar 'UI Stone' and a moderately susceptible cultivar 'Alturas' The population was evaluated for type II FHB resistance by measuring disease severity expressed as a percentage of infected spikelets (PIS) in four greenhouse experiments over three years. Two major QTL for type II FHB resistance, QFhbuis.ab--2B and QFhbuis.ab--3B , were identified by both single marker and composite interval mapping (CIM) methods and together these QTL explained 23.6 to 24.8% of phenotypic variation. Four additional QTL, QFhbuis.ab--1D, QFhbuis.ab--2D·1, QFhbuis.ab--2D·2 , and QFhbalt.ab--4A, were identified by either the single marker or CIM methods and were associated with disease severity in specific experiments. The two major QTL identified in this study have potential application in marker--assisted breeding of FHB resistance. This study also identified 4 lines with better FHB resistance and higher grain yield than UI Stone and these could be used as germplasm and/or released as new resistant cultivars after further testing.
机译：镰刀菌枯萎病（FHB）是小麦中最具破坏性的疾病之一，在世界上的潮湿地区造成了严重的产量损失和质量下降。它也是美国东南部爱达荷州的一种新兴小麦病。已知对FHB的抗性是一种定量遗传的性状，并受到混杂环境因素的高度影响。这项研究的目的是在151个（F4：6）重组自交系（RIL）中绘制和鉴定与FHB抗性相关的QTL，该重组自交系来自抗性品种'UI Stone'与中度敏感品种'Alturas'之间的杂交在三年的四个温室实验中，通过测量疾病严重性来表示II型FHB耐药性，方法是将疾病严重性表示为感染小穗的百分比（PIS）。通过单标记和复合区间作图（CIM）方法鉴定了II型FHB抗药性的两个主要QTL，即QFhbuis.ab--2B和QFhbuis.ab--3B，这些QTL共同解释了23.6％至24.8％的表型变异。通过单一标记法或CIM方法鉴定了另外四个QTL，QFhbuis.ab--1D，QFhbuis.ab--2D·1，QFhbuis.ab--2D·2和QFhbalt.ab--4A，并将它们相关联在特定实验中具有疾病严重程度。本研究中确定的两个主要QTL在标记物辅助FHB抗性育种中具有潜在的应用前景。这项研究还确定了4个品系比UI Stone具有更好的FHB抗性和更高的籽粒产量，它们可以用作种质和/或在进一步测试后作为新的抗性品种释放。

著录项

  • 作者

    Nayak, Santosh.;

  • 作者单位

    University of Idaho.;

  • 授予单位 University of Idaho.;
  • 学科 Agriculture Plant Culture.
  • 学位 M.S.
  • 年度 2014
  • 页码 85 p.
  • 总页数 85
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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