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Linear regression analysis elucidates the relationship between the soluble sugars, PAL enzyme activity, and anthocyanin contents 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 6h/day) followed by 2 days recovery. ns. non-significant; *P≤0.05; **P≤0.01; and ***P≤0.001.
