ISHS Acta Horticulturae 279: III International Workshop on Temperate Zone Fruits in the Tropics and Subtropics
POSTHARVEST COLORATION IMPROVEMENT OF ANNA APPLE BY WHITE FLUORESCENT LIGHT |
| Authors: | J. Sornsrivichai, R. Jampanil, S. Gomolmanee, O. Tuntawiroon, K. Boontham |
| Abstract:
Mature green Anna apples harvested 117 days after full bloom were irradiated with daylight fluorescent lamps of 21 W/m2 and 30 W/m2 (25–29°C, 60% RH) for 72 hours. Irradiation stimulated anthocyanin production. Average anthocyanin levels were 20 n mole idaein per cm2 of skin in the irradiated apples, compared with 5 n mole idaein per cm2 for non-irradiated control. The irradiated fruits showed a remarkable totally uniform bright red colour while the control fruits were pale green with some trace of red. Apples irradiated with 30 W/m2 and 21 W/m2 light intensity had the same potential for synthesizing the anthocyanin. There were no significant differences in anthocyanin synthesis and colour appearance for fruits irradiated with supplement light from two 30 W Grolux lamps and two 20 W black light lamps. The potential of these apples to synthesize anthocyanin after 1, 2 and 3 months, storage at 3°C was found to be persistent and averaged the same amount. After irradiation, %TSS content of fruit increased and flesh firmness, malic acid content decreased. The palatability scores were found to be higher after treatment because the fruits were sweeter. | |
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