Figure 3.

(A) Hydrogen peroxide (H₂O₂) (nmol g⁻¹ fw), (B) antioxidant potential (%), (C) superoxide dismutase (U mg⁻¹ protein), and (D) endogenous concentrations of salicylic acid (μg g⁻¹ fw) of winter wheat plants after 28 dpi treated with different nitrogen forms (calcium nitrate, ammonium sulfate, calcium cyanamide) under control conditions (black bars) and Bgt infection (gray bars). Data represent mean values of three biological replicates ± SE. The different lowercase letters indicate significant differences at 0.05 probability level according to Tukey multiple comparison test.