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<p>The aim of this study is to compare the tolerance mechanisms of four pepper (<i>Capsicum annuum</i>) varieties (Yükselince, Tural, Burdem and Varol) under drought stress. 58-day-old pepper seedlings were subjected to 10&#xa0;days-long drought stress by withholding irrigation. Plants were analyzed with regards to growth parameters, relative water content (RWC), total chlorophyll and carotenoid content, proline levels, lipid peroxidation, antioxidative enzyme activities, and photosynthetic efficiencies. Growth parameters, RWC and total chlorophyll and carotenoid contents of pepper varieties under drought stress decreased while proline contents and lipid peroxidation levels increased. The activities of antioxidant enzymes changed depending on varieties. Drought stress decreased the maximal quantum efficiency of PSII, the quantum yield of PSII photochemistry, photochemical quenching and electron transport rate values of the leaves of four varieties, and the most reduction was more pronounced in Varol. Contrary to these photochemical results, nonphotochemical quenching increased in all varieties and the lowest increase was recorded in Yükselince. From these results, Yükselince, which recorded the lowest reduction in growth parameters and total chlorophyll, the lowest increment in lipid peroxidation, the highest proline content and generally high antioxidative enzyme activities and photosynthetic efficiency, was considered more drought tolerant.</p>

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Determination of drought tolerance of pepper varieties by changes in physiological and biochemical parameters

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Nuran Durmuş,
  • Şule Demir

摘要

The aim of this study is to compare the tolerance mechanisms of four pepper (Capsicum annuum) varieties (Yükselince, Tural, Burdem and Varol) under drought stress. 58-day-old pepper seedlings were subjected to 10 days-long drought stress by withholding irrigation. Plants were analyzed with regards to growth parameters, relative water content (RWC), total chlorophyll and carotenoid content, proline levels, lipid peroxidation, antioxidative enzyme activities, and photosynthetic efficiencies. Growth parameters, RWC and total chlorophyll and carotenoid contents of pepper varieties under drought stress decreased while proline contents and lipid peroxidation levels increased. The activities of antioxidant enzymes changed depending on varieties. Drought stress decreased the maximal quantum efficiency of PSII, the quantum yield of PSII photochemistry, photochemical quenching and electron transport rate values of the leaves of four varieties, and the most reduction was more pronounced in Varol. Contrary to these photochemical results, nonphotochemical quenching increased in all varieties and the lowest increase was recorded in Yükselince. From these results, Yükselince, which recorded the lowest reduction in growth parameters and total chlorophyll, the lowest increment in lipid peroxidation, the highest proline content and generally high antioxidative enzyme activities and photosynthetic efficiency, was considered more drought tolerant.