Fig. 6

Effect of ZnO nanoparticles priming (50ppm) on biochemical responses in tomato: a catalase (units/min/gFW); b peroxidase (units/min/gFW) and c superoxide dismutase (units/ml/gFW) in three different varieties of tomato. Data presented as mean ± SE (n = 3). Bars with different lowercase letters indicate significant differences among treatment means (p < 0.05, Tukey’s HSD).