Figure 7.

Linear regression analysis elucidates the relationship between the soluble sugars, antioxidant enzyme activities, superoxide dismutase (SOD), catalase (CAT), polyphenol oxidase (PPO), and peroxidase (POD), ascorbate peroxidase (APX) in tomato plants cv “Super marmende” treated by γ-aminobutyric acid (GABA) as a foliar application at 1 and 2mM and growing under normal (25°C/20°C day/night) and chilling conditions (5 days/4ºC for 6 h/day) followed by 2 days recovery. ns. non-significant; ^*P≤0.05; ^**P≤0.01; and ^***P≤0.001.