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Changes in phytochelatin (PC) and glutathione (GSH) in alfalfa. Concentration of PC (a) and GSH (b) in the root and shoot of 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.
