Fig. 6
Effects of H2S on antioxidant enzyme activity under Cd stress in cucumber seedling roots. Cucumber seedlings pretreated with 100 μM NaHS were exposed to Cd stress for 48 h and analyzed the activity of SOD (a), CAT (b), POD (c), and APX (d). The data are means ± SE of three independent experiments. Different letters indicate a statistically significant difference (P < 0.05; Duncan’s multiple range test). FW, fresh weight