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<p>Foxtail millet is a staple food in arid and semi-arid regions. Altered rainfall patterns along with high temperature stress in these regions lead to yield reduction. Mitigating the interactive drought and high temperature stress in an ecofriendly manner with microbial population is essential. Initially, twenty-four foxtail millet genotypes were subjected to drought and high temperature stress by withdrawing the irrigation for 30&#xa0;days during peak vegetative to mid grain filling stage in rain-out shelter. The moisture during the stress period reduced from 40 to 8%, and air temperature ranged from 36 to 40&#xa0;°C. Finally, two contrasting genotypes [tolerant (ISe-15), susceptible (ISe-254)] were selected and grown in open-top chamber (OTC) to understand the mechanism behind tolerance/ susceptibility. Plants were maintained at control (T1) and combined drought [30% pot capacity (PC)] and high temperature (Ambient ± 10 °C) (T2). Stress, increased ABA and decreased GA in both the genotypes. Metabolic profiling revealed higher phenols, carbohydrates, hydroxycinnamic acid and lower fatty acids in ISe-15. Stress mitigation was attempted in the susceptible genotype by imposing foliar spray of 1% PPFM and 1% PGPB consortia in plants maintained at combined drought and high temperature at OTC. PPFM and PGPB increased the osmolyte accumulation by 54 and 47% and decreased the membrane damage by 47 and 57%, respectively, leading to enhanced root growth and antioxidant enzymes. The yield of ISe-254 under stress was improved by application of bacterial suspension up to 54%. PPFM was found to mitigate the combined stress more effectively than PGPB consortia.</p>

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Exploring the physiological mechanisms and ecofriendly mitigation strategies to combat the synergistic effects of drought and high temperature stress in Setaria italica

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • S. Gowsiga,
  • D. Vijayalakshmi,
  • J. Deepika,
  • P. Arunkumar,
  • R. Sivakumar,
  • U. Sivakumar,
  • V. Yamuna

摘要

Foxtail millet is a staple food in arid and semi-arid regions. Altered rainfall patterns along with high temperature stress in these regions lead to yield reduction. Mitigating the interactive drought and high temperature stress in an ecofriendly manner with microbial population is essential. Initially, twenty-four foxtail millet genotypes were subjected to drought and high temperature stress by withdrawing the irrigation for 30 days during peak vegetative to mid grain filling stage in rain-out shelter. The moisture during the stress period reduced from 40 to 8%, and air temperature ranged from 36 to 40 °C. Finally, two contrasting genotypes [tolerant (ISe-15), susceptible (ISe-254)] were selected and grown in open-top chamber (OTC) to understand the mechanism behind tolerance/ susceptibility. Plants were maintained at control (T1) and combined drought [30% pot capacity (PC)] and high temperature (Ambient ± 10 °C) (T2). Stress, increased ABA and decreased GA in both the genotypes. Metabolic profiling revealed higher phenols, carbohydrates, hydroxycinnamic acid and lower fatty acids in ISe-15. Stress mitigation was attempted in the susceptible genotype by imposing foliar spray of 1% PPFM and 1% PGPB consortia in plants maintained at combined drought and high temperature at OTC. PPFM and PGPB increased the osmolyte accumulation by 54 and 47% and decreased the membrane damage by 47 and 57%, respectively, leading to enhanced root growth and antioxidant enzymes. The yield of ISe-254 under stress was improved by application of bacterial suspension up to 54%. PPFM was found to mitigate the combined stress more effectively than PGPB consortia.