Scholarlink

<p>High temperature poses a significant threat to the growth and productivity of winter grain crops, particularly lentils. This challenge is expected to intensify in the future. This study aimed to assess the heat tolerance of different lentil landraces by evaluating their morphological, physiological, and biochemical responses under heat stress conditions. Eight lentil genotypes were tested, including six local Omani landraces ("Ibri," "Jumah," "Nizwa," "Rustaq," "Yanqul-1," and "Yanqul-2") and two exotic genotypes ("Markaz" and "14515"). Seedlings, aged 2&#xa0;weeks, were exposed to a gradual temperature increase of 2&#xa0;°C every 2&#xa0;days until reaching 35&#xa0;°C, under controlled glasshouse conditions. Results indicated that heat stress adversely affected all genotypes, with a significant reduction in growth parameters, including shoot length, leaf count, leaf area, chlorophyll content, relative water content, and both fresh and dry weights. Specifically, reductions in these parameters were 17.5%, 80.6%, 80.7%, 41.4%, 39.1%, 82.3%, and 82.9%, respectively, across all genotypes under heat stress. Based on these findings, the landraces were categorized into three groups: highly heat-tolerant, moderately heat-tolerant, and heat-sensitive. Notably, "Rustaq" and "Jumah" demonstrated remarkable tolerance, exhibiting superior morphological and physiological traits under heat stress conditions. Conversely, "Ibri" was classified as heat-sensitive, showing the lowest performance in these traits. The remaining landraces, "Nizwa," "Yanqul-1," and "Yanqul-2," displayed intermediate responses and were classified as moderately heat-tolerant. The heat-tolerant landraces showed a reduction in chlorophyll content of 8–13%, while the heat-sensitive landraces experienced a much higher reduction of 75–78%. Malondialdehyde concentrations increased by twofold in the heat-tolerant landraces but reached a tenfold increase in heat-sensitive varieties. In addition, membrane permeability and free proline content increased significantly in all genotypes, while catalase activity decreased under heat stress. The study revealed that Omani lentil landraces possess inherent mechanisms, such as antioxidant defense and stay-green traits, which help them cope with heat stress. In conclusion, the findings highlight that Omani lentil landraces, particularly 'Rustaq' and 'Jumah,' exhibit significant heat tolerance, making them valuable candidates for inclusion in breeding programs aimed at improving heat tolerance and ensuring food security in Oman.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Heat Tolerance in Omani Lentil Landraces and Their Stress Responses to Elevated Temperatures

  • 期刊论文

  • 发表日期：

    2025年7月8日

查看全文
  • Maryam Ismail Al Zeidi,
  • Muhammad Farooq

摘要

High temperature poses a significant threat to the growth and productivity of winter grain crops, particularly lentils. This challenge is expected to intensify in the future. This study aimed to assess the heat tolerance of different lentil landraces by evaluating their morphological, physiological, and biochemical responses under heat stress conditions. Eight lentil genotypes were tested, including six local Omani landraces ("Ibri," "Jumah," "Nizwa," "Rustaq," "Yanqul-1," and "Yanqul-2") and two exotic genotypes ("Markaz" and "14515"). Seedlings, aged 2 weeks, were exposed to a gradual temperature increase of 2 °C every 2 days until reaching 35 °C, under controlled glasshouse conditions. Results indicated that heat stress adversely affected all genotypes, with a significant reduction in growth parameters, including shoot length, leaf count, leaf area, chlorophyll content, relative water content, and both fresh and dry weights. Specifically, reductions in these parameters were 17.5%, 80.6%, 80.7%, 41.4%, 39.1%, 82.3%, and 82.9%, respectively, across all genotypes under heat stress. Based on these findings, the landraces were categorized into three groups: highly heat-tolerant, moderately heat-tolerant, and heat-sensitive. Notably, "Rustaq" and "Jumah" demonstrated remarkable tolerance, exhibiting superior morphological and physiological traits under heat stress conditions. Conversely, "Ibri" was classified as heat-sensitive, showing the lowest performance in these traits. The remaining landraces, "Nizwa," "Yanqul-1," and "Yanqul-2," displayed intermediate responses and were classified as moderately heat-tolerant. The heat-tolerant landraces showed a reduction in chlorophyll content of 8–13%, while the heat-sensitive landraces experienced a much higher reduction of 75–78%. Malondialdehyde concentrations increased by twofold in the heat-tolerant landraces but reached a tenfold increase in heat-sensitive varieties. In addition, membrane permeability and free proline content increased significantly in all genotypes, while catalase activity decreased under heat stress. The study revealed that Omani lentil landraces possess inherent mechanisms, such as antioxidant defense and stay-green traits, which help them cope with heat stress. In conclusion, the findings highlight that Omani lentil landraces, particularly 'Rustaq' and 'Jumah,' exhibit significant heat tolerance, making them valuable candidates for inclusion in breeding programs aimed at improving heat tolerance and ensuring food security in Oman.