Figure 4.

Hydrogen peroxide level (nMol H₂O₂ × min⁻¹ × mg protein⁻¹), CAT (μMol min⁻¹ mg⁻¹ protein), and APX (μMol × min⁻¹ × mg protein⁻¹) activities in roots and above-ground parts of B. juncea var. Malopolska seedlings grown in Hoagland’s medium and treated with lead, cooper, cadmium, and zinc ions. Metal solutions Pb(NO₃)₂, CuSO₄, CdCl₂, and ZnSO₄ were applied at a 50 μM concentration. Mean values of three replicates (±SD).