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Effects of CuO NPs exposed to antioxidant enzyme activities. (A) CAT; (B) SOD, and (C) POD are the activities in the roots and shoots of rice seedlings exposed to 62.5, 125 and 250 mg/L CuO NPs, supernatant from 250 mg/L CuO NPs suspensions and without treatment for 7 days. The bars indicate the mean and SD of triplicate samples. Different letters represent significant differences between the means of treatments (p < 0.05, Tukey-HSD).
