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Activities of (A) superoxide dismutase (SOD); (B) ascorbate peroxidase (APX); (C) monodehydroascorbate reductase (MDAR); (D) dehydroascorbate reductase (DHAR); (E) glutathione reductase (GR); (F) and catalase (CAT) in Al-treated and control leaves. Bars represent mean ± s.e. (n = 4). Different letters above the bars indicate a significant difference at P < 0·05.
