Catalase and glutathione reductase activities increased considerably in the root and leaves after 24-h exposure to cadmium, indicating a direct correlation with Cd accumulation. PAGE enzyme activity staining revealed several superoxide dismutase isoenzymes in leaves. The main response may be via activation of ascorbate-glutathione cycle for removal of hydrogen peroxide or to ensure availability of glutathione for synthesis of Cd-binding proteins[26].