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<p>The far-reaching consequences of climate change, including high temperature stress, significantly impede plant growth and development, posing a major challenge to plant productivity. Seedling stage of lentil is vulnerable to heat stress, which adversely affects seedling vigour. “Beat the heat by the heat” is a fascinating idea to improve seedling performance by priming the seeds with moderately high temperature to confer protection against the later heat stress. Our research demonstrated that thermo priming lentil seeds at 32&#xa0;°C for 24&#xa0;h effectively mitigates the adverse effects of heat stress during the seedling phase. Heat stress was induced by placing lentil seeds (IPL 316, PDL 1 and L 4147 genotypes) at 30&#xa0;°C for 16&#xa0;h, followed by 20&#xa0;°C for 8&#xa0;h in a repeated manner for 10 days. All three genotypes exhibited improved germination attributes, characterized by higher germination rates and reduced mean germination times, leading to quicker germination under heat stress. Thermo priming alleviated the adverse effects of heat stress by activating antioxidant defenses such as catalase, peroxidase, superoxide dismutase, which neutralize reactive oxygen species and reduce malondialdehyde, a by-product of lipid peroxidation, thereby maintaining membrane stability and promoting vigourous seedling growth. Moreover, pre-exposure to stress priming confers protection during seedling development by modulating metabolites, photosynthetic mechanism, sugar signals, ROS and other signaling pathways, ultimately enhancing plant tolerance to subsequent stressors. Therefore, seed thermo priming emerges as a highly effective strategy to mitigate the detrimental effects of heat stress on lentil seedlings.</p>

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Seed Thermo Priming Improved Seedling Performance and Heat Tolerance by Modulating Physio-Biochemical Attributes in Lentil

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Subramanian Poomani,
  • Sangita Yadav,
  • Ravish Choudhary,
  • Dharmendra Singh,
  • Anil Dahuja,
  • Shiv Kumar Yadav

摘要

The far-reaching consequences of climate change, including high temperature stress, significantly impede plant growth and development, posing a major challenge to plant productivity. Seedling stage of lentil is vulnerable to heat stress, which adversely affects seedling vigour. “Beat the heat by the heat” is a fascinating idea to improve seedling performance by priming the seeds with moderately high temperature to confer protection against the later heat stress. Our research demonstrated that thermo priming lentil seeds at 32 °C for 24 h effectively mitigates the adverse effects of heat stress during the seedling phase. Heat stress was induced by placing lentil seeds (IPL 316, PDL 1 and L 4147 genotypes) at 30 °C for 16 h, followed by 20 °C for 8 h in a repeated manner for 10 days. All three genotypes exhibited improved germination attributes, characterized by higher germination rates and reduced mean germination times, leading to quicker germination under heat stress. Thermo priming alleviated the adverse effects of heat stress by activating antioxidant defenses such as catalase, peroxidase, superoxide dismutase, which neutralize reactive oxygen species and reduce malondialdehyde, a by-product of lipid peroxidation, thereby maintaining membrane stability and promoting vigourous seedling growth. Moreover, pre-exposure to stress priming confers protection during seedling development by modulating metabolites, photosynthetic mechanism, sugar signals, ROS and other signaling pathways, ultimately enhancing plant tolerance to subsequent stressors. Therefore, seed thermo priming emerges as a highly effective strategy to mitigate the detrimental effects of heat stress on lentil seedlings.