Fig. 2

The effects of exogenous melatonin (MT) on superoxide dismutase (SOD) activity and decreased heavy metal accumulation in Exophiala pisciphila. E. pisciphila were pretreated with 0, 50.0, 100.0, or 200.0 μM melatonin (MT) for 1 d and then subjected to 111.2 mg L^− 1 Cd²⁺ (A, E), 100.0 mg L^− 1 Cu²⁺ (B, F), 1010.0 mg L^− 1, Zn²⁺ (C, G), or 800.0 mg L^− 1 Pb²⁺ (D, H) stress for 2 d. The SOD (A-D) activity and heavy metal (E-H) content of E. pisciphila were measured. Data are means ± SD (n = 4). Columns with different letters denote significant differences at P < 0.05 according to Duncan’s multiple range test