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Impacts of Cu–pH interactions on the activities of CAT (A,H), APX (B,I), DHAR (C,J), MDHAR (D,K), GR (E,L), GuPX (F,M), and SOD (G,N) in leaves and roots. Bars represent means ± SE (n = 4). Different letters above the bars indicate a significant difference at p < 0.05.
