Fig. 4
Influences of soil water conditions and foliar treatments on hydrogen peroxide (H2O2) and superoxide anion (O2.-) contents. Every column in each graph represents the mean (±SE) of three replicates. Various letters above columns indicate the significant differences among means (p < 0.05). WW, well-watered; WD, water-deficient; CK, control (double distilled water); SA, salicylic acid; Zn, zinc; GB, glycine betaine