Effects of exogenous cysteine on growth, copper accumulation and antioxidative systems in wheat seedlings under Cu stress Effects of Interaction Between Cadmium and Plumbum on Phytochelatins and Glutathione Production in Wheat (Triticum aestivum L.) AUeviatory Effect of Exogenous Glutathione (GSH) on Hydrocharis dubia Toxicated by Zn2+ Effects of GSH on AsA-GSH Circulation Metabolism in Chloroplasts of Young Loquat Fruits Under Low Temperature Stress