Figure 6

The effects of different concentrations of green and chemical CuO NPs at different times (24 & 48 h) on H2O2 production (a) and the activity of antioxidant enzymes CAT (b), GPX (c) and APX (d) in cell suspension culture of P. orientale. Values are means of three replicates. Error bars represent ± SE. Different letters above the columns represent statistically significant differences at P < 0.05 (Duncan’s multiple range test).