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Changes of Thiols and Oxidative Stress in Tomato Seedlings Exposed to Cadmium

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2006, v.29 no.1, pp.61-67


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Abstract

Tomato (Lycopersicon esculentum Mill) seedlings exposed to various concentrations of CdCl2 (0∼100 μM) in a nutrient solution for up to 9 days were analyzed with respect to the thiol changes and oxidative stress. The Cd exposure increased total non-protein thiols (NPT) and cysteine in both leaves and roots, total glutathione in leaves, and the ratios of oxidized glutathione (GSG)/reduced glutathione (GSH) in both leaves and roots, but decreased the ratio of dehydroascorbate (DASA)/ascorbate(ASA) in leaves. Our results sugest that the Cd-induced GSH depletion due to thiol synthesis and oxidation alters the antioxidant activity of seedlings for H2O2 2O2 accumulationand oxidative stress result in phytotoxicity.

keywords
Cadmium, Oxidative stress, Thiols, TomatoUn-Haing Cho and Nam-Ho Seo J. Ecol. Field Biol. 29 (1) 62induces ROS production and oxidative stress is also an interesting subject to investigate.In this work, the changes of NPTs and ascorbate in tomato se, Cadmium, Oxidative stress, Thiols, TomatoUn-Haing Cho and Nam-Ho Seo J. Ecol. Field Biol. 29 (1) 62induces ROS production and oxidative stress is also an interesting subject to investigate.In this work, the changes of NPTs and ascorbate in tomato se

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Journal of Ecology and Environment