Additional file 12: of Physiological and iTRAQ-based proteomic analyses reveal the function of exogenous γ-aminobutyric acid (GABA) in improving tea plant (Camellia sinensis L.) tolerance at cold temperature

Figure S4: Changes in polyamines contents during the four treatments (25 °C, 25 °C + GABA, 4 °C and 4 °C + GABA for T1, T2, T3 and T4, respectively). Data represent the mean value ± standard deviation. Means with different letters are significantly different from each other (p ≤ 0.05). Put, putrescine; Spd, spermidine; Spm, spermine. (PDF 158 kb