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Effects of Al toxicity on the activities of superoxide dismutase (SOD) (A); ascorbate peroxidase (APX) (B); catalase (CAT) (C); monodehydroascorbate reductase (MDAR) (D) and lipoxygenase (LOX) (E) in C. sinensis leaves. Bars represent the means ± SE (n = 4). Significance tests for two means (control and Al toxicity) were carried out by the unpaired t-test at the p < 0.05 level. Different letters above the bars indicate a significant difference at p < 0.05.
