Figure 6. Effect of different salts at various concentrations on the level of activity (a) and secretion (b) of peroxidase enzyme in hairy root clone LMG-150 estimated on 20^th day of the culture period (X-axis: 1: NaCl, 2: KCl, 3: MgCl₂, 4: CaCl₂, 5: Na₂SO₄, 6: Na₂CO₃, 7: KNO₃).