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<p>Wheat is susceptible to drought during the early seedling stage, often resulting in reduced seedling establishment and vigor. Early seedling stage screening is a rapid, cost-effective, and reliable method for identifying potential drought-tolerant genotypes. The experiment was conducted in a two-factor factorial completely randomized design (CRD) under three moisture regimes: 100% field capacity (FC), 75% field capacity (S1), and 50% field capacity (S2), with two replications. Advanced pipelines and released cultivars were evaluated for eight seedling traits. Analysis of Variance revealed a significant variation for both genotypes and moisture regimes (<i>P</i> ≤ 0.05). The coefficient of variation decreased for root traits with an increase in drought stress. Root and shoot traits were strongly correlated at FC and S1 but not at S2. Root length, specific root length, and root-to-shoot ratio showed stronger responses to drought stress, while shoot traits and biomass responded more to high moisture. Based on relative performance and stress tolerance index (STI) analyses, WK4125, WK4126, and WK3350 were identified as potential drought-tolerant wheat genotypes. Further field screening and validation of drought tolerance using drought-responsive molecular markers will facilitate effective utilization of identified drought-tolerant genotypes in future breeding programs.</p>

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Assessment of early seedling stage indices for the selection of potential drought-tolerant bread wheat genotypes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月24日

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  • Sujan Chapagain,
  • Bishnu Prasad Kandel,
  • Ankur Poudel,
  • Sancheet Gautam,
  • Samir Nepal,
  • Sandesh Subedi,
  • Mahesh Subedi

摘要

Wheat is susceptible to drought during the early seedling stage, often resulting in reduced seedling establishment and vigor. Early seedling stage screening is a rapid, cost-effective, and reliable method for identifying potential drought-tolerant genotypes. The experiment was conducted in a two-factor factorial completely randomized design (CRD) under three moisture regimes: 100% field capacity (FC), 75% field capacity (S1), and 50% field capacity (S2), with two replications. Advanced pipelines and released cultivars were evaluated for eight seedling traits. Analysis of Variance revealed a significant variation for both genotypes and moisture regimes (P ≤ 0.05). The coefficient of variation decreased for root traits with an increase in drought stress. Root and shoot traits were strongly correlated at FC and S1 but not at S2. Root length, specific root length, and root-to-shoot ratio showed stronger responses to drought stress, while shoot traits and biomass responded more to high moisture. Based on relative performance and stress tolerance index (STI) analyses, WK4125, WK4126, and WK3350 were identified as potential drought-tolerant wheat genotypes. Further field screening and validation of drought tolerance using drought-responsive molecular markers will facilitate effective utilization of identified drought-tolerant genotypes in future breeding programs.