Abstract
A hydroponic experiment was carried out to investigate the effects of sulfur (S) supply and hydrogen peroxide (H2O2) pretreatment on the growth and physio- logical responses by rice under cadmium (Cd) stress. Seedlings were grown with normal S level (3.4 mmolL -1 sulfate), S deficiency (0 mmolL -1 sulfate) for 6 days, or H2O2 (100 lmolL -1 ) pretreatments for 1 day and subse- quently exposed to 1.0 lmolL -1 Cd for 7 days. In the S-deficient rice, both shoot and root Cd contents were in- creased 8.9 and 24.3 % respectively. In addition, cys- teine (Cys), glutathione (GSH) and phytochelation (PC2-4) levels were increased significantly, while opposite effects were observed in the S-deficient rice. H2O2 pretreatment induced stronger Cd resistance in rice, as the amounts of thiols and the activity of glutathione S-transferase (GST) were all increased and the seedling growth was not inhib- ited by Cd stress. In conclusion, the results in this study demonstrated the adequate S supply and H2O2 pretreatment were important in Cd detoxification in rice through main- tenance of cellular thiol levels and GST activity.
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