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Exogenously applied melatonin enhanced the tolerance of Brassica napus against cobalt toxicity by modulating antioxidant defense, osmotic adjustment, and expression of stress response genes

文献类型： 外文期刊

作者： Skhawat Ali;Rafaqat A. Gill;Zaid Ulhassan;Na Zhang;Saddam Hussain;Kangni Zhang;Qian Huang;Muhammad Sagir;Muhammad Bilal Tahir;Muhammad B. Gill;Theodore M. Mwamba;Basharat Ali;Weijun Zhou

作者机构：

关键词： Abiotic stress tolerance;Antioxidants;Oilseed rape;Oxidative stress;Phytohormone

期刊名称： Ecotoxicology and Environmental Safety

ISSN： 0147-6513

年卷期： 2023 年 252 卷

页码：

收录情况： SCIE（2023版）

摘要： The excessive accumulation of cobalt (Co) in plant tissues severely impairs plant growth that ultimately reduces the yield. However, melatonin (MT) has been known to mediate the abiotic stress tolerance in plants. The present study aimed at investigating the protective mechanisms of exogenously applied MT (0, 50 and 100 μM) under Co (0, 100, 200 and 300 μM) stress by focusing on morpho-physiological, biochemical and cellular characterizations of Brassica napus plants. Cobalt (300 μM) alone treatment drastically inhibited the stomatal conductance, plant height (45%), leaf area (30%), free amino acid (139%), relative electrolyte leakage (109%), and total soluble sugars (71%), compared with the control. However, the exogenous supply of MT notably minimized the oxidative damage, lipid peroxidation and maintained the membrane integrity under Co-toxicity by restricting the overproduction of ROS (H2O2 and O2•–), and MDA in leaves and roots. Melatonin significantly enhanced the activities of ROS-scavenging antioxidant enzymes, secondary metabolism-related phenylalanine ammonia lyase (PAL), polyphenol oxidase (PPO), stress-responsive genes (heat shock protein as HSP-90, methyl transferase as MT) and regulated the Co-transporters, especially in roots. These findings indicated that an exogenous supply of MT improve the plant morphology, photosynthetic apparatus, osmotic adjustments, and antioxidant defense systems by enhancing the Co-detoxification in B. napus plants.

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