Figure 3.

(a) Relative hydrogen peroxide (H₂O₂) levels and (b) H₂O₂/GSH ratios in leaves (green bars) and roots (grey bars) of Arabidopsis thaliana plants grown under control conditions (0 μM CdSO₄, light bars) or exposed to 5 μM CdSO₄ (dark bars) during 2 h, 4 h, 6 h and 24 h after 3 weeks of growth. For each time point, data represent the mean ± S.E. of four biological independent replicates. Significant differences (t-test: p < 0.05) between control and exposed plants, within each time point, are indicated with an asterisk (*).