Figure 2.

Emission of H₂S and its positive effect on root growth inhibition caused by Cd stress in Chinese cabbage. (a) The expressions of H₂S synthase-encoding genes LCD, DCD1, and DES1 under Cd stress. (b) The production rate of H₂S under increasing concentrations of Cd. (c) Effects of different concentrations of NaHS on root development under 5 mM Cd treatment. Three-day-old seedlings were exposed to different concentrations of Cd (0, 5, 10, and 20 mM) for 48 h. Data are mean ± SE of three independent repeats. Using one-way ANOVA and compared with controls, significance is shown by ^∗ P < 0.05, ^∗∗ P < 0.01; LSD was used for multiple comparisons; different letters indicate significant differences (P < 0.05).