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<p>Climate change, characterized by elevated atmospheric CO<sub>2</sub> (eCO<sub>2</sub>) and rising temperatures (eT), poses significant challenges to crop productivity, particularly in grain legumes including black gram. This study investigated the interactive effects of eCO<sub>2</sub> and eT on physiological, phenological, and yield-related traits across multiple genotypes of black gram. Elevated CO<sub>2</sub> improved photosynthetic rate, SPAD, water use efficiency (WUE), and root biomass, while elevated temperature of + 3.0&#xa0;°C over ambient alone negatively impacted these traits by increasing transpiration and limiting CO<sub>2</sub> uptake. While genotype specific responses were observed eCO<sub>2</sub> and eT, with certain genotypes such as PLU826 and IPU941 demonstrating better performances through higher photosynthetic rates and pod yields under combined eT+eCO<sub>2</sub> conditions. The present investigation revealed that elevated CO<sub>2</sub> mitigated adverse effects of high temperature by stabilizing phenological development and enhancing total biomass and grain yield. The study highlights the complex physiological interplay between CO<sub>2</sub> and temperature and underscores the importance of genotype selection in developing climate-resilient legume cultivars.</p>

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Individual and interactive effects of elevated temperature and CO2 on the growth, physiological and yield traits of black gram

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • Basudeb Sarkar,
  • M. Vanaja,
  • P. Sathish,
  • R. Mythily,
  • N. Jyothi Lakshmi,
  • B. S. Yashavanth,
  • M. Srinivasa Rao,
  • M. Prabhakar,
  • Vinod Kumar Singh

摘要

Climate change, characterized by elevated atmospheric CO2 (eCO2) and rising temperatures (eT), poses significant challenges to crop productivity, particularly in grain legumes including black gram. This study investigated the interactive effects of eCO2 and eT on physiological, phenological, and yield-related traits across multiple genotypes of black gram. Elevated CO2 improved photosynthetic rate, SPAD, water use efficiency (WUE), and root biomass, while elevated temperature of + 3.0 °C over ambient alone negatively impacted these traits by increasing transpiration and limiting CO2 uptake. While genotype specific responses were observed eCO2 and eT, with certain genotypes such as PLU826 and IPU941 demonstrating better performances through higher photosynthetic rates and pod yields under combined eT+eCO2 conditions. The present investigation revealed that elevated CO2 mitigated adverse effects of high temperature by stabilizing phenological development and enhancing total biomass and grain yield. The study highlights the complex physiological interplay between CO2 and temperature and underscores the importance of genotype selection in developing climate-resilient legume cultivars.