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首页> 外文学位 >Identifying quantitative trait loci (QTLs) for fumonisin accumulation and ear rot resistance in maize (Zea mays L.).
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Identifying quantitative trait loci (QTLs) for fumonisin accumulation and ear rot resistance in maize (Zea mays L.).

机译：确定玉米中伏马毒素的积累和穗腐病抗性的数量性状基因座（QTL）。

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摘要

Fusarium verticillioides and F. proliferatum are fungal pathogens of maize that cause ear rot and contaminate maize with fumonisin. The first objective was to investigate the relationship between Fusarium ear rot and fumonisin contamination. Two populations, BC 1F1:2 families created from the cross of GE440 x FR1064 (GEFR population) and recombinant inbred lines created from the cross of NC300 x B104 (NCB population) were studied. Moderate to high heritabilities and strong genetic correlations between ear rot and fumonisin concentration were estimated and suggest that selection for reduced ear rot should frequently identify low fumonisin lines. Quantitative trait loci (QTL) mapping was then used to study genetic relationships between the two traits and to investigate consistency of QTL across populations. Eight QTL in the GEFR population and five QTLs in the NCB population affected both traits. At least three ear rot and two fumonisin contamination QTLs mapped to similar positions in the two populations. Two QTL appeared to be consistent for both traits across both populations. To investigate the relationship between resistance and agronomic utility in the GEFR population, yield and agronomic performance were measured in line testcrosses. Correlation and QTL analyses were employed to study these relationships. QTLs identified included 7 yield, 5 grain moisture, 8 plant height, 6 ear height, 3 silk date, and 4 tassel date QTLs. If backcrossing were utilized to move fumonisin contamination resistance alleles into the FR1064 background, our correlation results suggest that correlated responses would include an increase in grain moisture and a decrease in stalk lodging. Our QTL mapping results suggest that only a small reduction in grain yield and a small increase in plant height would be expected from backcrossing fumonisin resistance alleles into FR1064. However, marker-assisted selection may facilitate breaking linkages between resistance alleles and alleles reducing agronomic performance. The second objective was to investigate the resistances to Fusarium and Aspergillus ear rots and fumonisin and aflatoxin contamination in selected lines. Based on the NCB study, the 24 highest and 24 lowest mean fumonisin concentration lines were selected. The low fumonisin group had significantly lower levels of both mycotoxins and ear rots. All four traits were significantly correlated, suggesting that at least some of the genes involved in resistance to ear rots and mycotoxin contamination by these fungal species are identical or genetically linked.
机译：枯萎镰刀菌和野生镰刀菌是玉米的真菌病原体，会引起耳腐，并用伏马菌素污染玉米。第一个目标是研究镰刀菌耳腐和伏马毒素的污染之间的关系。研究了两个种群，从GE440 x FR1064的杂交产生的BC 1F1：2家族（GEFR种群）和从NC300 x B104的杂交产生的重组自交系（NCB种群）。估计中度到高遗传力以及耳腐和伏马毒素浓度之间的强遗传相关性，这表明针对减少耳腐的选择应经常鉴定低伏马毒素。然后使用数量性状基因座（QTL）作图来研究这两个性状之间的遗传关系，并研究群体间QTL的一致性。 GEFR种群中有8个QTL和NCB种群中有5个QTL影响了这两个性状。映射到两个种群中相似位置的至少三个耳腐和两个伏马菌素污染QTL。两个群体的两个性状的两个QTL似乎是一致的。为了研究GEFR群体中抗性与农艺效用之间的关系，在品系测试杂交中测量了产量和农艺性能。相关性和QTL分析被用来研究这些关系。确定的QTL包括7个产量，5个谷物水分，8个株高，6个穗高，3个丝枣和4个穗型QTL。如果利用回交将伏马菌素污染抗性等位基因移至FR1064背景，我们的相关结果表明相关的响应将包括谷物水分的增加和茎秆倒伏的减少。我们的QTL作图结果表明，将伏马菌素抗性等位基因回交到FR1064中，预计谷物产量仅会小幅下降，株高会略微提高。但是，标记辅助选择可能有助于打破抗性等位基因和等位基因之间的联系，从而降低农艺学性能。第二个目的是研究所选系中对镰刀菌和曲霉耳腐病以及伏马毒素和黄曲霉毒素污染的抗性。根据NCB研究，选择了24个最高的和24个最低的伏马毒素浓度平均值线。低伏马毒素的组霉菌毒素和耳腐的水平明显较低。所有这四个性状均显着相关，表明这些真菌物种对耳部腐烂和霉菌毒素污染的抗性中至少有一些基因是相同的或遗传相关的。

著录项

  • 作者

    Robertson-Hoyt, Leilani Ann.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Agriculture Plant Pathology.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 200 p.
  • 总页数 200
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物病理学;
  • 关键词

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