• Journal of Life Science
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• v.15 no.2 s.69
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• pp.298-303
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• 2005

This experiment was carried to investigate the optimum time and times of abscisic acid (ABA) treatment for the coloration in 'Kyoho' grapes. The L-phenylalanine ammonia-lyase (PAL) enzyme activities were showed highly in both ABA treatments at veraison and 10 days after veraison. However, PAL enzyme was slightly higher in ABA treatment at 10 days after veraison than in that at veraison. Anthocyanin content showed a tendency that were increased during fruit development after veraison in all treatments, and was the highest in ABA treatment at 10 days after veraison. Fructose and glucose as soluble sugars were detected by HPLC and showed little differences in all treatments. In times of ABA treatment, PAL activity showed a tendency that decreased after increased in all treatments. PAL activity in 2 times treatment of ABA was higher than other treatments. Also, anthocyanin content was highest in 2 times treatment of ABA, as 5 folds of control and folds of 1 time treatment of ABA. Both fructose and glucose contents in all ABA treatments was slightly higher than control.