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Effect of chitosan treatment on the activities of APX (A), MDHAR (B), DHAR (C), and GR (D) at apple wounds. Non-wounded fruit treated with sterile water (N + water), non-wounded fruit treated with chitosan (N + chitosan), wounded fruit treated with sterile water (W + water), and wounded fruit treated with chitosan (W + chitosan). Vertical bars indicate standard error of means. For each day after wounding, alphabets indicate significant differences (P < 0.05).
