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<p>Climate change is expected to intensify drought stress, leading to yield instability and threatening wheat production, which poses serious risks to global food security. Thus, developing drought-tolerant cultivars is the most economical and sustainable approach to attain the required wheat production. In the current study, a total of 42 diverse hexaploid wheat lines were evaluated for drought tolerance using phenotypic and SSR marker data. Twelve traits including phenological, grain yield components and physiological were analysed. For most of the variables, analysis of variance showed substantial differences between genotypes, conditions, and genotype × condition. Strong genetic control is indicated by high heritability and genetic variability of yield, phenological, and yield-contributing traits. Based on the drought susceptibility index (DSI) for grain yield (GY), 25 genotypes were identified as drought-tolerant and 17 as susceptible. The genotypes, SPH66, SPH91, SYN42, SYN9, MACS6222, and DBW327 were identified as highly tolerant. The polymorphism information content (PIC) ranged from 0.28 (<i>Xcfd43</i>) to 0.70 (<i>Xgwm111</i>), and allelic richness was observed with 2 to 5 alleles per locus. Tolerant genotypes such as SPH 37, SPH 38, SPH 44, SPH 48, SYN42, SYN56, and SYN87 were consistently grouped together in both clusters based on phenotypic and molecular data and may serve as donors in future breeding programs. Further, the detection of five significant allelic associations for markers <i>Xgwm484, Xwmc517, Xwmc702,</i> and <i>Xgwm108</i> suggests that these alleles may serve as functional indicators of drought tolerance and can be targeted for marker-assisted selection for the development of drought-resilient wheat varieties.</p>

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Assessing Genetic Diversity and Drought Adaptive Potential in Diverse Hexaploid Wheat Accessions

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Divyanshu Choudhary,
  • Seema Sheoran,
  • Sawan Kumar,
  • Sonu,
  • C. N. Mishra,
  • Satish Kumar,
  • Rajender Singh,
  • Sindhu Sareen

摘要

Climate change is expected to intensify drought stress, leading to yield instability and threatening wheat production, which poses serious risks to global food security. Thus, developing drought-tolerant cultivars is the most economical and sustainable approach to attain the required wheat production. In the current study, a total of 42 diverse hexaploid wheat lines were evaluated for drought tolerance using phenotypic and SSR marker data. Twelve traits including phenological, grain yield components and physiological were analysed. For most of the variables, analysis of variance showed substantial differences between genotypes, conditions, and genotype × condition. Strong genetic control is indicated by high heritability and genetic variability of yield, phenological, and yield-contributing traits. Based on the drought susceptibility index (DSI) for grain yield (GY), 25 genotypes were identified as drought-tolerant and 17 as susceptible. The genotypes, SPH66, SPH91, SYN42, SYN9, MACS6222, and DBW327 were identified as highly tolerant. The polymorphism information content (PIC) ranged from 0.28 (Xcfd43) to 0.70 (Xgwm111), and allelic richness was observed with 2 to 5 alleles per locus. Tolerant genotypes such as SPH 37, SPH 38, SPH 44, SPH 48, SYN42, SYN56, and SYN87 were consistently grouped together in both clusters based on phenotypic and molecular data and may serve as donors in future breeding programs. Further, the detection of five significant allelic associations for markers Xgwm484, Xwmc517, Xwmc702, and Xgwm108 suggests that these alleles may serve as functional indicators of drought tolerance and can be targeted for marker-assisted selection for the development of drought-resilient wheat varieties.