Fig. 4

Analysis of SOD expression and H₂O₂ accumulation in B. campestris seedlings. a Expression of SOD genes was normalized relative to that of Actin7. Experiments were replicated four times with similar results. Data represent mean ± SD (n = 12). Asterisks indicate statistically significant differences relative to the control (0 mg/L) (Student’s t-test; *p < 0.05, **p < 0.01, ***p < 0.001). b CTC-induced reduction in H₂O₂ accumulation in root tips of 4-day-old seedlings, as shown by DAB staining