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Effects of γ-aminobutyric acid (GABA) on (A) superoxide anion (O2−), (B) hydrogen peroxide (H2O2), and (C) malondialdehyde (MDA) content under normal, heat, and drought condition. Vertical bars indicate ±SE of mean (n = 4). Different letters above columns indicate significant differences for one particular treatment (control or +GABA) under different conditions; asterisk “*” indicates significant difference between control and +GABA treatment under a given condition.
