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. 2021 Oct 18;12:663750. doi: 10.3389/fpls.2021.663750

Figure 5.

Figure 5

Effect of γ-aminobutyric acid (GABA) as a foliar application at 1 and 2mM on antioxidant and phenolic-related enzymes of tomato plants cv “Super marmende” growing under normal (25°C/20°C day/night ) and chilling conditions (5 days/4ºC for 6 h/day) followed by 2 days recovery. (A), superoxide dismutase (SOD); (B), catalase (CAT); (C), polyphenol oxidase (PPO); (D), peroxidase (POD); (E), ascorbate peroxidase (APX), and (F), phenylalanine ammonia lyase (PAL). Data followed by the same letters ± SE are not significant according to Duncan multiple rang test at P≤0.05. The white columns refer to the control conditions and the black columns refer to the chilling stress.