FIGURE 4.
Effects of exogenous melatonin on (A) superoxide anion (O2-) and (B) hydrogen peroxide (H2O2) contents of chloroplasts under chilling stress. Control (28/18°C); Control + Melatonin (200 μM melatonin, 28/18°C); Chilling (15/8°C); Chilling + Melatonin (200 μM melatonin, 15/8°C). Data are means ± SD of three replicates.