Fig. 3.

Influences of melatonin treatment on lightness L* value (A), hue angle (B) and chlorophyll content (C) in the peel 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).