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Enzymatic activity of ascorbate peroxidase (APX) (A), glutathione peroxidase (GPX) (B), phenylalanine ammonia lyase (PAL) (C), and catalase (CAT) (D) in leaves of tomato plants. Al: Positive control inoculated with A. solani; CNT: Carbon nanotubes; OX: Commercial control; T0: Control. Different letters indicate significant differences between treatments according to the least significant difference of Fisher test (α = 0.05). N = 5 ± standard error.
