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Synthetic potential for anthocyanin seemed to initiate 60 to 90 days after anthesis. Before the developmental stage anthocyanin synthesis was not induced even with ethylene application and complementary light irradiation. Blue light irradiation was most effective on the induction of coloration, followed by white and red light irradiation suggesting the involvement of phytochrome in the synthesis of anthocyanin. Light was essential for the anthocyanin synthesis showing synergistic effects with ethylene at room temperature. However, for fruit quality, light treatment at low temperature storage(0℃) was better, even though the pigmentation was slow. Combined treatment of light irradiation, low temperature, and ethephon increased the activities of ethylene forming enzyme (EFE), phenylalanine ammonia-lyase (PAL), and polyphenol oxidase (PPO). ABA, zeatin, auxin, and internal ethylene concentration was also increased.
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