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<p>The prompt surge in the global temperature is posing a great risk to food security worldwide by triggering the heat stress in crops. Rice, a staple food to more than fifty percent of the global population, is highly prone to elevated temperature stress these days, especially at the flowering stage. Glutathione, classified as an antioxidant, has the potential to mitigate the drastic effects of elevated temperature. The main objectives of the study were to analyze the effects of high-temperature stress on leaf physiology, yield and quality attributes of basmati rice and to quantify the dose of foliar-applied glutathione for improving basmati rice thermotolerance. A two-year controlled pot experiment was conducted to achieve the above-mentioned objectives. Experiment consisted of two levels of heat including H<sub>0</sub> (no heat imposed) and H<sub>1</sub> (heat imposed at flowering) and glutathione was applied at four concentrations including 0.25&#xa0;mM, 0.50&#xa0;mM, 0.75&#xa0;mM and 1&#xa0;mM, while a control was also maintained (no glutathione). Four replications were used. Findings revealed that heat stress at flowering significantly reduced the key physiological attributes such as chlorophyll <i>a</i>, <i>b,</i> and carotenoids; reduced kernel yield and compromised the quality of fine rice by increasing opaque and chalky kernels and by reducing grain protein content. On the other hand, foliar application of glutathione improved all the measured traits as compared to untreated plants. The maximum effectiveness was observed with the application of 1&#xa0;mM glutathione among the different tested levels. </p>

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Glutathione role in improving leaf physiology, yield and quality of rice (Oryza sativa L.) under high temperature stress at flowering stage

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Rania Baloch,
  • Muhammad Farrukh Saleem,
  • Muhammad Sarwar,
  • Muhammad Awais Arshad,
  • Muhammad Shahid,
  • Amina Rashid

摘要

The prompt surge in the global temperature is posing a great risk to food security worldwide by triggering the heat stress in crops. Rice, a staple food to more than fifty percent of the global population, is highly prone to elevated temperature stress these days, especially at the flowering stage. Glutathione, classified as an antioxidant, has the potential to mitigate the drastic effects of elevated temperature. The main objectives of the study were to analyze the effects of high-temperature stress on leaf physiology, yield and quality attributes of basmati rice and to quantify the dose of foliar-applied glutathione for improving basmati rice thermotolerance. A two-year controlled pot experiment was conducted to achieve the above-mentioned objectives. Experiment consisted of two levels of heat including H0 (no heat imposed) and H1 (heat imposed at flowering) and glutathione was applied at four concentrations including 0.25 mM, 0.50 mM, 0.75 mM and 1 mM, while a control was also maintained (no glutathione). Four replications were used. Findings revealed that heat stress at flowering significantly reduced the key physiological attributes such as chlorophyll a, b, and carotenoids; reduced kernel yield and compromised the quality of fine rice by increasing opaque and chalky kernels and by reducing grain protein content. On the other hand, foliar application of glutathione improved all the measured traits as compared to untreated plants. The maximum effectiveness was observed with the application of 1 mM glutathione among the different tested levels.