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<p>This study was conducted to observe the effects of temperatures and myoinositol on thermotolerance in early grain filling of climate-resilient crop Quinoa. Different temperature levels including 32/21℃, 36/23℃, and 40/25℃ were given to the BBCH scale 69 (early grain filling) of Quinoa in the glasshouse for seven days to observe the critical temperature levels while 26/19&#xa0;°C was the control during two years of study. The plants were grown at optimal temperatures until flowering. During early grain filling, four sets of pots were placed in the respective chambers and 10&#xa0;mM myoinositol was sprayed one day before moving the pots into their respective chambers. Quinoa leaf physiology and grain yield began to decrease at 36&#xa0;°C, while a significant reduction was observed at 40&#xa0;°C over the plants of optimal temperature. For example, seed yield per panicle per plant, 1000-grain weight, and net photosynthesis rate (Pn) were reduced by 40%, 34%, and 42% at 40&#xa0;°C, respectively due to the reduction in efficiency of leaf physiology and the antioxidants compared to the optimal temperature plants. Foliar spray with myoinositol significantly increased the seed yield per panicle per plant, 1000-grain weight, and Pn by 20%, 19%, and 18% at 46&#xa0;°C, respectively compared to the water-treated plants of respective thermal regimes due to increasing stability in photosynthetic efficiency and plant defensive system. Findings showed that 36&#xa0;°C was the critical temperature for quinoa, while 40&#xa0;°C caused a significant reduction in leaf physiology and grain yield, while foliar application of myoinositol improved leaf physiology and grain yield at 40&#xa0;°C.</p>

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Myoinositol-mediated regulation of leaf physiology, biochemistry, and water relations confers heat stress tolerance in Quinoa

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Rashid Iqbal,
  • Muhammad Sarwar,
  • Basharat Ali,
  • Muhammad Farrukh Saleem,
  • Hassaan Ahmad,
  • Muhammad Shahid,
  • Javed Iqbal,
  • Khairiah Mubarak Alwutayd,
  • Dilfuza Jabborova,
  • Sajad Ali,
  • Ghulam Murtaza

摘要

This study was conducted to observe the effects of temperatures and myoinositol on thermotolerance in early grain filling of climate-resilient crop Quinoa. Different temperature levels including 32/21℃, 36/23℃, and 40/25℃ were given to the BBCH scale 69 (early grain filling) of Quinoa in the glasshouse for seven days to observe the critical temperature levels while 26/19 °C was the control during two years of study. The plants were grown at optimal temperatures until flowering. During early grain filling, four sets of pots were placed in the respective chambers and 10 mM myoinositol was sprayed one day before moving the pots into their respective chambers. Quinoa leaf physiology and grain yield began to decrease at 36 °C, while a significant reduction was observed at 40 °C over the plants of optimal temperature. For example, seed yield per panicle per plant, 1000-grain weight, and net photosynthesis rate (Pn) were reduced by 40%, 34%, and 42% at 40 °C, respectively due to the reduction in efficiency of leaf physiology and the antioxidants compared to the optimal temperature plants. Foliar spray with myoinositol significantly increased the seed yield per panicle per plant, 1000-grain weight, and Pn by 20%, 19%, and 18% at 46 °C, respectively compared to the water-treated plants of respective thermal regimes due to increasing stability in photosynthetic efficiency and plant defensive system. Findings showed that 36 °C was the critical temperature for quinoa, while 40 °C caused a significant reduction in leaf physiology and grain yield, while foliar application of myoinositol improved leaf physiology and grain yield at 40 °C.