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The activities of typical antioxidant enzymes superoxide dismutase, SOD (a), glutathione reductase, GR (b), ascorbate peroxidase, APX (c) in leaf extracts on treatment with menadione in normal (NL) or high light (HL). Each data point is the average of three replicates, and error bars represent ±SE. Asterisks indicate the significance of MD effect compared to the respective control. * p < 0.05; ** p < 0.001.
