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This experiment was carried out to investigate the effect of ABA and kinetin treatments on coloration and quality of ´Campbell Early´ and ´Black Olympia´ grapes. In both cultivars, soluble solids content in the flesh increased as the maturation progressed and was not affected by ABA treatment. However, higher kinetin concentrations resulted in the higher soluble solids. Titratable acidity decreased as the ripening progressed and was not affeted by ABA, but increased at higher concentration of kinetin. In both cultivars, ABA enhanced anthocyanin accumulation at the beginning of maturation in the skin. The higher level of ABA showed the more anthocyanin contents. Anthocyanin accumulation decreased when ABA and kinetin were treated in combination, but increased at low kinetin concentration (ABA 1000 ㎎/L + kinetin 10 ㎎/L). Total phenolic compounds in the skin increased during maturation, and were very higher in ´Campbell Early´ than in ´Black Olympia´. Total phenolic compounds during maturation were higher with ABA treatment than in control, but in ´Campbell Early´ no differences were observed at the harvest period. Total phenolic compounds were the highest in ABA 500 mg1L treatment and also increased in ABA and kinetin treatments. PAL activity in the skin increased during maturation, and was the highest at 20 days after ABA treatment, and then decreased gradually. ´Campbell Early´ exhibited much higher PAL activity than ´Black olympia´. No differences in PAL activity were shown according to increment of ABA level. PAL activity in ´Campbell Early´ was the highest in ABA 1000 ㎎/L + kinetin 10 ㎎/L treatment.
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