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Effects of the different treatments on antioxidant enzyme activities. (A,B) superoxide dismutase (SOD) activity in shoots and roots; (C,D) peroxidase (POD) activity in shoots and roots; (E,F) catalase (CAT) activity in shoots and roots. Vertical bars represent mean ± SD of four replicates. Different letters above error bars indicate the significant difference between treatments and genotypes at p ≤ 0.05. T, treatment; G, genotype; T × G, the interaction between treatment and genotype.
