Fig. 6

Effects of different concentrations of ZS-3 siderophore on H₂O₂ (A), MDA (B) contents and Super Oxide Dismutase (SOD) (C), POD (D) activities in Arabidopsis. 1/2MS was used as the control, －Fe indicates iron-deficient treatment, and −Fe + Fe₂O₃ indicates addition of Fe₂O₃ to iron-deficient treatment. T1 (500 µL ZS-3 siderophore added to 100 mL of −Fe + Fe₂O₃ medium), T2 (1 mL ZS-3 siderophore added to 100 mL of −Fe + Fe₂O₃ medium), T3 (3 mL ZS-3 siderophore added to 100 mL of −Fe + Fe₂O₃ medium) and T4 (5 mL ZS-3 siderophore added to 100 mL of −Fe + Fe₂O₃ medium) with different lowercase letters indicate significant differences between treatments (P < 0.05)