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Background <p>Drought stress is a major abiotic constraint to tomato (<i>Solanum lycopersicum</i> L.) production, particularly at early developmental stages. Screening genotypes under controlled osmotic stress is crucial for identifying drought-tolerant cultivars. This study evaluated five tomato genotypes Khumal 2, Monoprecos, NGRCO9569, NGRCO9571, and Srijana for germination and seedling performance under polyethylene glycol (PEG)-induced drought stress to identify resilient candidates for breeding programs.</p> Results <p>A completely randomized design (CRD) experiment was conducted under three PEG levels (0%, 3%, and 6%). Significant genotype × stress interactions were observed (<i>p</i> &lt; 0.05) across germination and seedling traits. NGRCO9569, Monoprecos, and Khumal 2 maintained high germination rates, seedling vigor, and biomass under stress. In contrast, Srijana exhibited sharp declines in all measured parameters, including complete germination failure at 6% PEG. Vigor index and root-to-shoot ratio increased in tolerant genotypes, indicating effective stress adaptation. Multivariate analyses, including MGIDI and DRI indices, consistently ranked NGRCO9569 and Khumal 2 as top performers. Strong positive correlations were found among plant height, root spread, biomass, and vigor.</p> Conclusion <p>NGRCO9569, Monoprecos, and Khumal 2 demonstrated superior drought tolerance under PEG-induced stress and are promising candidates for field validation and breeding. The observed genetic variability highlights potential for drought-resilient tomato improvement. Integrating these genotypes into molecular studies focusing on QTL mapping and gene expression profiling will aid in developing climate-resilient cultivars suited for low-irrigation environments.</p>

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Screening tomato genotypes for early-stage drought tolerance using polyethylene glycol-induced osmotic stress

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月30日

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  • Pankaj Kumar Yadav,
  • Prabina Bhujel,
  • Nirajan Bhandari,
  • Shaurav Sharma,
  • Aasha Sharma

摘要

Background

Drought stress is a major abiotic constraint to tomato (Solanum lycopersicum L.) production, particularly at early developmental stages. Screening genotypes under controlled osmotic stress is crucial for identifying drought-tolerant cultivars. This study evaluated five tomato genotypes Khumal 2, Monoprecos, NGRCO9569, NGRCO9571, and Srijana for germination and seedling performance under polyethylene glycol (PEG)-induced drought stress to identify resilient candidates for breeding programs.

Results

A completely randomized design (CRD) experiment was conducted under three PEG levels (0%, 3%, and 6%). Significant genotype × stress interactions were observed (p < 0.05) across germination and seedling traits. NGRCO9569, Monoprecos, and Khumal 2 maintained high germination rates, seedling vigor, and biomass under stress. In contrast, Srijana exhibited sharp declines in all measured parameters, including complete germination failure at 6% PEG. Vigor index and root-to-shoot ratio increased in tolerant genotypes, indicating effective stress adaptation. Multivariate analyses, including MGIDI and DRI indices, consistently ranked NGRCO9569 and Khumal 2 as top performers. Strong positive correlations were found among plant height, root spread, biomass, and vigor.

Conclusion

NGRCO9569, Monoprecos, and Khumal 2 demonstrated superior drought tolerance under PEG-induced stress and are promising candidates for field validation and breeding. The observed genetic variability highlights potential for drought-resilient tomato improvement. Integrating these genotypes into molecular studies focusing on QTL mapping and gene expression profiling will aid in developing climate-resilient cultivars suited for low-irrigation environments.