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Pubmed ID :28771007
Publication Date : 2017/08/03

Thymol Ameliorates Cadmium-Induced Phytotoxicity in the Root of Rice (Oryza sativa) Seedling by Decreasing Endogenous Nitric Oxide Generation.


Thymol has been developed as medicine and food preservative due to its immune-regulatory effect and antimicrobial activity, respectively. However, little is currently known about the role of thymol in the modulation of plant physiology. In the present study, we applied biochemical and histochemical approaches to investigate thymol-induced tolerance in rice (Oryza sativa) seedlings against Cd (cadmium) stress. Thymol at 20 μM recovered root growth completely upon CdCl2 exposure. Thymol pronouncedly decreased Cd-induced ROS accumulation, oxidative injury, cell death, and Cd(2+) accumulation in roots. Pharmaceutical experiments suggested that endogenous NO mediated Cd-induced phytotoxicity. Thymol decreased Cd-induced NO accumulation by suppressing the activity of NOS (nitric oxide synthase) and NR (nitrate reductase) in root. The application of NO donor (SNP, sodium nitroprusside) resulted in the increase in endogenous NO level, which in turn compromised the alleviating effects of thymol on Cd toxicity. Such findings may helpful to illustrate the novel role of thymol in the modulation of plant physiology, which may be applicable to improve crop stress tolerance.

Authors : Wang Ting-Ting , Shi Zhi Qi , Hu Liang-Bin , Xu Xiao-Feng , Han Fengxiang X , Zhou Li-Gang , Chen Jian ,

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