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<p>Salinity stress represents one of the key environmental constraints affecting wheat (<i>Triticum aestivum L.</i>) production, thus making the development of new salt-tolerant varieties highly critical. It is essential to identify the genes and mechanisms associated with salinity tolerance for the molecular breeding of this crop. In this study, 186 F12 recombinant inbred lines (RILs) were evaluated to identify quantitative trait loci (QTLs) associated with phenotypic and physiological traits at the seedling stage under saline conditions. A total of 12 main-effect QTLs were detected through composite interval mapping (CIM) for traits associated with salinity tolerance, including survival rate, carotenoid content, chlorophyll, glucose, germination percentage, average seedling weight, and phenol content. These QTLs were consistently identified on chromosomes 3A, 4A, 5A, 1B, 3B, 7B, 1D, 2D, and 7D, highlighting their potential role in controlling multiple physiological and biochemical responses under saline conditions. Candidate genes were identified within the QTL regions, and a gene ontology (GO) enrichment analysis was conducted. In total, 7,698 candidate genes were categorized into 47 GO terms, including 14 terms related to the biological process categoryGene prioritization identified 179 candidate genes linked to diverse biological processes, including catabolism, hydrogen peroxide metabolism, stress and oxidative stress responses, hydrolase activity, phenylpropanoid metabolism, and carbohydrate metabolism, as well as other related pathways. This methodology is proposed for discovering new candidate genes linked to specific QTLs responsible for complex traits.</p>

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Identification of genes affecting survival and some physiological traits in salt-responsive bread wheat (Triticum aestivum L.)

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Elina Nazari Khakshoor,
  • Peyman Fourozesh,
  • Amin Azadi,
  • Eslam Majidi Hervan,
  • Alireza Etminan

摘要

Salinity stress represents one of the key environmental constraints affecting wheat (Triticum aestivum L.) production, thus making the development of new salt-tolerant varieties highly critical. It is essential to identify the genes and mechanisms associated with salinity tolerance for the molecular breeding of this crop. In this study, 186 F12 recombinant inbred lines (RILs) were evaluated to identify quantitative trait loci (QTLs) associated with phenotypic and physiological traits at the seedling stage under saline conditions. A total of 12 main-effect QTLs were detected through composite interval mapping (CIM) for traits associated with salinity tolerance, including survival rate, carotenoid content, chlorophyll, glucose, germination percentage, average seedling weight, and phenol content. These QTLs were consistently identified on chromosomes 3A, 4A, 5A, 1B, 3B, 7B, 1D, 2D, and 7D, highlighting their potential role in controlling multiple physiological and biochemical responses under saline conditions. Candidate genes were identified within the QTL regions, and a gene ontology (GO) enrichment analysis was conducted. In total, 7,698 candidate genes were categorized into 47 GO terms, including 14 terms related to the biological process categoryGene prioritization identified 179 candidate genes linked to diverse biological processes, including catabolism, hydrogen peroxide metabolism, stress and oxidative stress responses, hydrolase activity, phenylpropanoid metabolism, and carbohydrate metabolism, as well as other related pathways. This methodology is proposed for discovering new candidate genes linked to specific QTLs responsible for complex traits.