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Antioxidant enzymes responses of Dendrobium officinale to cold acclimation. The activities of (A) superoxide dismutase (SOD) activity, (B) catalase (CAT) activity, (C) peroxidase (POD) activity, and (D) ascorbate peroxidase (APX) were quantified by the means of three independent experiments ± SD. Different letters mark indicates significantly different at P < 0.01.
