Catalase (A), superoxide dismutase (B) and peroxidase activities (C) of broccoli microgreens after 0, 4, 7, 14 and 21 d of storage at 5 °C. CAT, catalase; SOD, superoxide dismutase; POD, peroxidase. Data presented are the means of four replications; vertical lines represent standard errors. Different letters (a and b) indicate significant differences between treatment means at α = 0.05 on the same day.