Figure 4.

Effects of DMTU and H₂O₂ on the germination of maize seeds treated with IDS, Pb, or their combination. Maize seeds treated with distilled water (control), Pb (20 mmol·dm⁻³ PbCl₂), IDS (100 mmol·dm⁻³), or Pb+IDS were further treated with DMTU or H₂O₂ for 1 d. Error bars represent the standard deviation of the mean (n = 5). Means associated with different letters are significantly different among treatments and time points (p < 0.05; Duncan’s new multiple range test). Pb, lead; IDS, iminodisuccinic acid; DMTU, dimethylthiourea.