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<b>Key message</b> <p><b>GWAS and targeted transcriptomic analysis identified three QTLs and novel candidate causal genes for preharvest sprouting resistance in wheat.</b></p> Abstract <p>Preharvest sprouting (PHS), which causes significant yield and quality losses in wheat, is primarily associated with low level of seed dormancy. This study conducted a genome-wide association analysis of a diverse panel of spring wheat genotypes across five environments to identify loci and candidate causal genes controlling seed dormancy/PHS resistance. Phenotypic evaluation of the mapping panel revealed substantial variation in seed dormancy levels/PHS resistance among the genotypes. Marker-trait association analysis identified 14 SNPs significantly linked to seed dormancy/PHS resistance based on a false discovery rate (FDR) of α = 0.05. These SNPs are mapped to three QTLs on chromosomes 4A, 5B, and 5D. The QTL on 4A, <i>QPhs.umb-4A</i>, which&#xa0;consists of 11 SNPs that explained 10.7 to 20.8% of the phenotypic variation, is the most significant locus. The QTLs on 5B (<i>QPhs.umb-5B</i>) and 5D (<i>QPhs.umb-5D</i>) accounted for 10.2 to 11.4% of the phenotypic variation. A total of 730 unique candidate genes are associated with the three QTLs, and targeted transcriptomic analysis of selected candidate genes offered insights into their potential role in controlling seed dormancy and PHS resistance. The identified SNPs and candidate genes have the potential to enhance marker-assisted selection for improved&#xa0;PHS resistance in wheat.</p>

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Genetic loci and novel candidate causal genes for preharvest sprouting resistance in wheat (Triticum aestivum L.)

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Ramanpreet Ramanpreet,
  • Gurkamal Kaur,
  • Pham Anh Tuan,
  • Muhammad Iqbal,
  • Curt A. McCartney,
  • Dean Spaner,
  • Belay T. Ayele

摘要

Key message

GWAS and targeted transcriptomic analysis identified three QTLs and novel candidate causal genes for preharvest sprouting resistance in wheat.

Abstract

Preharvest sprouting (PHS), which causes significant yield and quality losses in wheat, is primarily associated with low level of seed dormancy. This study conducted a genome-wide association analysis of a diverse panel of spring wheat genotypes across five environments to identify loci and candidate causal genes controlling seed dormancy/PHS resistance. Phenotypic evaluation of the mapping panel revealed substantial variation in seed dormancy levels/PHS resistance among the genotypes. Marker-trait association analysis identified 14 SNPs significantly linked to seed dormancy/PHS resistance based on a false discovery rate (FDR) of α = 0.05. These SNPs are mapped to three QTLs on chromosomes 4A, 5B, and 5D. The QTL on 4A, QPhs.umb-4A, which consists of 11 SNPs that explained 10.7 to 20.8% of the phenotypic variation, is the most significant locus. The QTLs on 5B (QPhs.umb-5B) and 5D (QPhs.umb-5D) accounted for 10.2 to 11.4% of the phenotypic variation. A total of 730 unique candidate genes are associated with the three QTLs, and targeted transcriptomic analysis of selected candidate genes offered insights into their potential role in controlling seed dormancy and PHS resistance. The identified SNPs and candidate genes have the potential to enhance marker-assisted selection for improved PHS resistance in wheat.