Scholarlink

<p>Water shortage is a major abiotic stress limiting wheat production worldwide, particularly in Iran. This study aimed to identify genetic loci and candidate genes associated with grain yield and related traits in spring bread wheat under water shortage conditions. Genotyping of 111 spring bread wheat genotypes was conducted using the 15K SNP array developed by TraitGenetics (Germany) on the Illumina platform. Phenotypic evaluations of the studied genotypes were conducted from 2020 To 2022 using a lattice square design under both well-watered and water shortage stress environments in Iran. Broad-sense heritability estimates under water shortage stress conditions varied among traits, with the lowest value (12.04%) observed for the grain length-to-width ratio and the highest (89.15%) for thousand-grain weight. A total of 48 and 32 significant marker-trait associations (MTAs) were identified under well-watered and water shortage conditions, respectively. Significant associations were found for traits including grain weight per spike, 1000-grain weight, grain length, grain width, and grain length-to-width ratio under water shortage stress. Key genes identified—<i>TraesCS2B02G000200</i>, <i>TraesCS4B02G000100</i>, and <i>TraesCS5A02G000100</i>—associated with markers on chromosomes 2B, 4B, and 5A, respectively, provide insights into molecular mechanisms governing water shortage tolerance. The observed variation in genomic prediction accuracy across stress conditions highlights the critical roles of genetic diversity, genotype-by-environment interactions, and genomic selection methodologies. These findings advance our understanding of the genetic architecture of drought tolerance and highlight the potential of marker-assisted selection to accelerate the development of high-yielding, tolerant wheat cultivars.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Genome-Wide Association Mapping Reveals Novel Loci Influencing Wheat Yield Under Water Shortage Conditions

  • 期刊论文

  • 发表日期：

    2026年1月8日

查看全文
  • Ahmad MajidiMehr,
  • Mohammad hadi Pahlevani,
  • Khalil ZaynaliNezhad,
  • Andreas Börner,
  • Rahmatollah Karimizadeh

摘要

Water shortage is a major abiotic stress limiting wheat production worldwide, particularly in Iran. This study aimed to identify genetic loci and candidate genes associated with grain yield and related traits in spring bread wheat under water shortage conditions. Genotyping of 111 spring bread wheat genotypes was conducted using the 15K SNP array developed by TraitGenetics (Germany) on the Illumina platform. Phenotypic evaluations of the studied genotypes were conducted from 2020 To 2022 using a lattice square design under both well-watered and water shortage stress environments in Iran. Broad-sense heritability estimates under water shortage stress conditions varied among traits, with the lowest value (12.04%) observed for the grain length-to-width ratio and the highest (89.15%) for thousand-grain weight. A total of 48 and 32 significant marker-trait associations (MTAs) were identified under well-watered and water shortage conditions, respectively. Significant associations were found for traits including grain weight per spike, 1000-grain weight, grain length, grain width, and grain length-to-width ratio under water shortage stress. Key genes identified—TraesCS2B02G000200, TraesCS4B02G000100, and TraesCS5A02G000100—associated with markers on chromosomes 2B, 4B, and 5A, respectively, provide insights into molecular mechanisms governing water shortage tolerance. The observed variation in genomic prediction accuracy across stress conditions highlights the critical roles of genetic diversity, genotype-by-environment interactions, and genomic selection methodologies. These findings advance our understanding of the genetic architecture of drought tolerance and highlight the potential of marker-assisted selection to accelerate the development of high-yielding, tolerant wheat cultivars.