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Purpose <p>Soil cadmium (Cd) pollution severely impacts vegetable quality and yield. This study aimed to evaluate the efficacy of exogenous melatonin (MT) and glutathione (GSH) in mitigating Cd-induced stress in cucumber seedlings by analyzing their physiological and biochemical responses.</p> Methods <p>This experiment evaluated the stress-alleviating effects of foliar application of exogenous MT (150 µM) and GSH (5 mM), both individually and in combination, on cucumber seedlings under Cd (100 µM) stress.</p> Results <p>Exogenous MT (150 µM) and GSH (5 mM) alleviated Cd (100 µM) stress in cucumber seedlings by enhancing antioxidant defense and reducing Cd translocation. MT boosted growth by about 20%, while GSH increased it by about 30%. They also improved root activity, reduced the relative conductivity and malondialdehyde (MDA) content of the leaves, and decreased Cd root-to-shoot transfer by 16% and 8.2%, respectively.</p> Conclusions <p>These findings demonstrate that exogenous MT and GSH alleviate Cd toxicity in cucumber seedlings by improving physiological and biochemical responses, providing a viable strategy to enhance crop resilience in Cd-contaminated soils.</p>

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Effects of Exogenous Melatonin and Glutathione on the Physiology and Biochemistry of Cucumber Seedlings Under Cadmium Stress

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Zhi Huang,
  • Yatian Zhao,
  • Xiaoxiao Chen,
  • Junyan Song,
  • Liping Su,
  • Weiping Xu,
  • Xuena Yu,
  • Kehao Liang,
  • Yi Tang,
  • Huanhuan Huang,
  • Bo Sun

摘要

Purpose

Soil cadmium (Cd) pollution severely impacts vegetable quality and yield. This study aimed to evaluate the efficacy of exogenous melatonin (MT) and glutathione (GSH) in mitigating Cd-induced stress in cucumber seedlings by analyzing their physiological and biochemical responses.

Methods

This experiment evaluated the stress-alleviating effects of foliar application of exogenous MT (150 µM) and GSH (5 mM), both individually and in combination, on cucumber seedlings under Cd (100 µM) stress.

Results

Exogenous MT (150 µM) and GSH (5 mM) alleviated Cd (100 µM) stress in cucumber seedlings by enhancing antioxidant defense and reducing Cd translocation. MT boosted growth by about 20%, while GSH increased it by about 30%. They also improved root activity, reduced the relative conductivity and malondialdehyde (MDA) content of the leaves, and decreased Cd root-to-shoot transfer by 16% and 8.2%, respectively.

Conclusions

These findings demonstrate that exogenous MT and GSH alleviate Cd toxicity in cucumber seedlings by improving physiological and biochemical responses, providing a viable strategy to enhance crop resilience in Cd-contaminated soils.