Figure 4.

Effect of KI on antioxidant enzymatic activity attributes of soybean plants under well-watered conditions (blue columns, on the left) and water deficit (red columns, on the right) one day before rehydration. (A) (SOD—superoxide dismutase), (B) APX—ascorbate peroxidase, (C) CAT—catalase, and (D) POD—guaiacol peroxidase. Blue bars are irrigated samples and red bars are water deficit samples. Values are presented as average ± SD (n  =  5). Equal letters indicate no significant differences calculated using the Tukey test (p  >  0.05). Different uppercase letters represent statistical differences (p < 0.05) between KI concentrations, while lowercase letters indicate differences between irrigation conditions.