Figure 7.

Melatonin affected the activities of key antioxidant enzymes in response to cadmium stress. The activities of SOD (A), APX (B), CAT (C), and POD (D) of the four-day-old wheat seedlings were separately determined at 12 h after root treatment with cadmium (0.2 mM), or melatonin + cadmium. Data are means ± SE of three replicates. Means with different letters (a, b, and c) are significantly different at p < 0.05 using Tukey’s test. Me, melatonin; SOD, superoxide dismutase; APX, ascorbate peroxidase; CAT, catalase; POD, peroxidase.