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Changes in different ROS indicators and antioxidant enzymes in root and shoot of alfalfa. Response of H2O2 (a), lipid peroxidation (b), SOD (c), CAT (d), APX (e) and GR (f) in alfalfa cultivated in different conditions of Hg and GSH: +Hg (40 μM), +Hg+GSH (40 μM Hg+50 μM GSH), and +GSH (50 μM GSH). Data represent means ± SD of three independent biological samples. Different letters indicate a significant difference at the p < 0.05 level.
