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<p><i>Fusarium</i> head blight (FHB) is a global detrimental disease affecting wheat production. While Guixie 3 shows strong resistance to FHB, its resistance mechanism is not well understood. Hence, this study aims to elucidate the genetic basis of disease resistance in Guixie 3 and identify new genetic resources for FHB resistance in wheat. The study used an <i>F</i><sub>2:7</sub> recombinant inbred line population developed by crossing Avocet S with Guixie 3. FHB resistance was phenotypically evaluated across 2&#xa0;years and two locations (i.e., four environments) after single-floret inoculation, and it was genetically mapped using the wheat 55&#xa0;K single-nucleotide polymorphism array. A total of 15 quantitative trait loci (QTLs) for FHB resistance were detected on chromosomes 1D (2), 2A (2), 2B (3), 2D.1 (2), 3B (1), 4A (1), 4B (1), 4D (1), 5A (1), and 5B.2 (1). Notably, a QTL on chromosome 2D.1, designated as <i>Qfhb.gaas.2D.1–1</i>, was consistently detected in two environments. This QTL spanned the interval AX-86163393 to AX-110072786, with a genetic interval of 45.12–46.51&#xa0;cM and a physical interval of 35.68–37.04&#xa0;Mb (1.36&#xa0;Mb). It explained 14.07–33.00% of the phenotypic variation. Furthermore, 39 candidate genes were identified in this target region, of which eight were predicted to be associated with FHB resistance. These candidate genes will be further analyzed and validated for FHB resistance in future studies.&#xa0;</p>

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Genetic mapping of the Fusarium head blight resistance gene in wheat Guixie 3

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月15日

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  • Yonglu Luo,
  • Bin Cheng,
  • Tianqing Chen,
  • Jianshu Sui,
  • Wenqiang Wu,
  • Qing Xu,
  • Wei Wang

摘要

Fusarium head blight (FHB) is a global detrimental disease affecting wheat production. While Guixie 3 shows strong resistance to FHB, its resistance mechanism is not well understood. Hence, this study aims to elucidate the genetic basis of disease resistance in Guixie 3 and identify new genetic resources for FHB resistance in wheat. The study used an F2:7 recombinant inbred line population developed by crossing Avocet S with Guixie 3. FHB resistance was phenotypically evaluated across 2 years and two locations (i.e., four environments) after single-floret inoculation, and it was genetically mapped using the wheat 55 K single-nucleotide polymorphism array. A total of 15 quantitative trait loci (QTLs) for FHB resistance were detected on chromosomes 1D (2), 2A (2), 2B (3), 2D.1 (2), 3B (1), 4A (1), 4B (1), 4D (1), 5A (1), and 5B.2 (1). Notably, a QTL on chromosome 2D.1, designated as Qfhb.gaas.2D.1–1, was consistently detected in two environments. This QTL spanned the interval AX-86163393 to AX-110072786, with a genetic interval of 45.12–46.51 cM and a physical interval of 35.68–37.04 Mb (1.36 Mb). It explained 14.07–33.00% of the phenotypic variation. Furthermore, 39 candidate genes were identified in this target region, of which eight were predicted to be associated with FHB resistance. These candidate genes will be further analyzed and validated for FHB resistance in future studies.