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Influences of melatonin treatment on fruit chilling injury symptoms (A), chilling injury index (B), cell membrane relative leakage rate (C), commercially acceptable fruit rate (D) and weight loss (E) of guavas during storage at 4 °C. Mean ± standard error (n = 3) was applied to represent each value. Remarkable differences between the 100 μmol/L melatonin-treated guavas and control guavas on the same storage day are indicated by * (P < 0.05) and ** (P < 0.01).
