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Production of hydrogen peroxide detected by DAB staining under Zn2+ or Cd2+ stress. DAB staining of WT and N14 leaves subjected to 200 mM/L CdCl2, 300 mM/L ZnSO4, or 30 mM/L H2O2 for 15 min, 30 min, 1 h, 3 h, or 6 h, respectively. WT: Wild-type tobacco. N14: homozygous transgenic tobacco line (T2). Asterisks indicate the significant difference between transgenic lines and WT.
