Figure 7.

The concentration of superoxide anion, H₂O₂, ATP and T-AOC (A–D) and the activities of SOD, POD and CAT (E–G) of three Coptis species under 20°C and 30°C. Different letters with different color (gray and red) indicate a significant difference at P < 0.05 between three Coptis species under 20°C and 30°C, respectively. The asterisks indicate a significant difference between plants grown at 20°C and 30°C as determined by Student’s t-test (*p < 0.05, **p < 0.01) and ns means no difference between the treatment. Each column represents the mean ± standard deviation of three replicates.