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： Ali, Skhawat 1 ; Gill, Rafaqat A. 3 ; Ulhassan, Zaid 1 ; Zhang, Na 1 ; Hussain, Saddam 4 ; Zhang, Kangni 1 ; Huang, Qian 1 ; Sagir, Muhammad 5 ; Tahir, Muhammad Bilal 5 ; Gill, Muhammad B. 6 ; Mwamba, Theodore M. 7 ; Ali, Basharat 5 ; Zhou, Weijun 1 ;
作者机构： 1.Zhejiang Univ, Inst Crop Sci, Hangzhou 310058, Peoples R China
2.Zhejiang Univ, Zhejiang Key Lab Crop Germplasm, Hangzhou 310058, Peoples R China
3.Chinese Acad Agr Sci, Minist Agr & Rural Affairs, Oil Crops Res Inst, Key Lab Biol & Genet Improvement Oil Crops, Wuhan 430062, Peoples R China
4.Univ Agr Faisalabad, Dept Agron, Faisalabad 38040, Pakistan
5.Khwaja Fareed Univ Engn & Informat Technol KFUEIT, Rahim Yar Khan, Pakistan
6.Univ Tasmania, Sch Land & Food, Hobart, Tas, Australia
7.Univ Lubumbashi, Dept Crop Sci, Lubumbashi 1825, Rep Congo
关键词： Oilseed rape; Abiotic stress tolerance; Phytohormone; Antioxidants; Oxidative stress
期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）
ISSN： 0147-6513
年卷期： 2023 年 252 卷
页码：
收录情况： SCI
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 mu M) under Co (0, 100, 200 and 300 mu M) stress by focusing on morpho-physiological, biochemical and cellular characterizations of Brassica napus plants. Cobalt (300 mu M) 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 center dot-), 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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