Effects of ABA，GA₃ and NAA on Fruit Development and Anthocyanin Accumulation in Blueberry

The influences of ABA (600 mg/L), GA₃ (30 mg/L) and NAA (200 mg/L) treatments on the fruit growth and the contents of anthocyanins, phenolics, sugars and flavonoids in blueberry，Vaccinium cv. Bluecrop，were studied. The results showed that during the period from veraison to full maturity, there were marked positive correlations between the contents of anthocyanins and hexoses and a negative correlation between contents of anthocyanins and flavonoids. Compared with the control, ABA treatment promoted fruit softening and significantly increased the contents of anthocyanins (3.01 mg/g), fructose (13.22 mg/g) and glucose (35.51 mg/g) in fruit; NAA treatment significantly reduced the fruit weight and suppressed the accumulation of total phenols and flavonoids; GA₃ treatment significantly increased fruit mass and the content of soluble solids. Both NAA and GA₃ treatment reduced the accumulation of anthocyanins, but the effect was not significant, and the final content was 2.29 mg/g.