Difference Between Coloration and Endogenous Abscisic Acid Accumulation Patterns in Two Red Grape Cultivars, ‘Aki Queen’ and ‘Ruby Roman’ (<i>Vitis labruscana</i> Bailey) Berries

Changes in anthocyanin and endogenous abscisic acid (ABA) contents the berry skins of Vitis labruscana × V. vinifera cultivars, ‘Aki Queen’, ‘Ruby Roman’ were investigated during fruit development period. Color Queen’ berries mainly occurred within 20 days post véraison, while that was prolonged for about 40 days. In both ABA level skin started to increase a few before véraison; however, accumulation ceased approximately 10 after véraison it continued until late stage maturation Roman’. addition, higher indole-3-acetate aspartate (IAA-Asp) lower isopentenyladenine (iP) observed than at stage. The expression analysis genes involved metabolism revealed 9-cis-epoxycarotenoid dioxygenase 3 (VviNCED3), which is assumed play major role biosynthesis, remained relatively véraison. Considering plays regulatory grape maturation, these results may indicate coloration later partly attributable an increased pool skins.