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Thymol Mitigates Cadmium Stress by Regulating Glutathione Levels and Reactive Oxygen Species Homeostasis in Tobacco Seedlings

文献类型： 外文期刊

作者： Ye, Xiefeng 1 ; Ling, Tianxiao 1 ; Xue, Yanfeng 2 ; Xu, Cunfa 3 ; Zhou, Wei 4 ; Hu, Liangbin 4 ; Chen, Jian 5 ; Shi, Zhiq 1 ;

作者机构： 1.Henan Agr Univ, Coll Tobacco Sci, Zhengzhou 450002, Peoples R China

2.Nanjing Yangzi Modern Agr Investment & Dev Co Ltd, Nanjing 211899, Jiangsu, Peoples R China

3.Jiangsu Acad Agr Sci, Cent Lab, Nanjing 210014, Peoples R China

4.Henan Inst Sci & Technol, Dept Food Sci, Xinxiang 453003, Peoples R China

5.Jiangsu Acad Agr Sci, Inst Food Qual & Safety, Nanjing 210014, Peoples R China

6.Jiangsu Prov Dept Agr & Forestry, Key Lab Food Qual & Safety Jiangsu Prov, State Key Lab Breeding Base, Nanjing 210014, Peoples R China

关键词： thymol;reactive oxygen species;cell death;glutathione;cadmium;tobacco

期刊名称：MOLECULES （ 2020影响因子：4.411； 五年影响因子：4.587 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Thymol is a famous plant-derived compound that has been widely used in pharmacy due to its antioxidant and antimicrobial properties. However, the modulation of intrinsic plant physiology by thymol remains unclear. It is a significant challenge to confer plant tolerance to Cd (cadmium) stress. In the present study physiological, histochemical, and biochemical methods were applied to investigate thymol-induced Cd tolerance in tobacco (Nicotiana tabacum) seedlings. Thymol was able to alleviate Cd-induced growth inhibition of tobacco seedlings in both dose-and time-dependent manners. Both histochemical detection and in-tube assays suggested that thymol treatment blocked Cd-induced over-generation of reactive oxygen species (ROS), lipid peroxidation, and loss of membrane integrity in both leaves and roots. Thymol decreased Cd-induced cell death that was indicated in vivo by propidium iodide (PI) and trypan blue, respectively. Thymol stimulated glutathione (GSH) biosynthesis by upregulating the expression of gamma-glutamylcysteine synthetase 1 (GSH1) in Cd-treated seedlings, which may contribute to the alleviation of Cd-induced oxidative injury. In situ fluorescent detection of intracellular Cd2+ revealed that thymol significantly decreased free Cd2+ in roots, which could be explained by the thymol-stimulated GSH biosynthesis and upregulation of the expression of phyochelatin synthase 1 (PCS1). Taken together, these results suggested that thymol has great potential to trigger plant resistant responses to combat heavy metal toxicity, which may help our understanding of the mechanism for thymol-modulated cell metabolic pathways in response to environmental stimuli.

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