Effects of S-abscisic acid treatment on fruit color and quality in 'Kyoho' grape

K. Yamane, X. Xie, T. Kurokura
High temperature affects color and quality of grape fruits, especially at the maturing stage. In this study, (S)-2-cis-abscisic acid (S-ABA)-containing fertilizer was applied to 'Kyoho' grapes in order to improve their fruits quality. In 2012, 0, 20, 100 or 400 mg L-1 S-ABA-containing liquid fertilizer was sprayed on fruits at 6, 16 and 24 days after veraison (DAV). Anthocyanin level was increased and titratable acidity (TA) was declined by the S-ABA treatments. The treatment of 400 mg L-1 S-ABA at 24 DAV significantly increased fruits weight and total soluble solids (TSS). In 2014, 100 or 400 mg L-1 S-ABA and racemic RS-ABA were applied to 'Kyoho' grape fruits at 7, 14 and 21 DAV. The application of S-ABA resulted in the increments of anthocyanin by 100 and 400 mg L-1 at 14 and 21 DAV. Fruit weight and TSS were not influenced by the treatments, while TA was decreased by the treatments at 14 and 21 DAV. RS-ABA was less effective than S-ABA, probably because concentration of active (S)-2-cis-ABA form in the commercially available synthetic RS-ABA was lower than that of S-ABA containing-fertilizer. (S)-2-cis- and (R)-2-cis-ABA were isomerized into isomers such as (S)-2-trans-ABA and (R)-2-trans-ABA after UV exposure for 3 days. Effects of S- and RS-ABA on fruit quality were discussed.
Yamane, K., Xie, X. and Kurokura, T. (2018). Effects of S-abscisic acid treatment on fruit color and quality in 'Kyoho' grape. Acta Hortic. 1206, 239-246
DOI: 10.17660/ActaHortic.2018.1206.33
anthocyanin, cis-trans isomer, racemic RS-ABA, titratable acid, TSS

Acta Horticulturae