The accumulation of hexose sugars (glucose, fructose) is associated with the development of xylem cell discontinuities which reduce the volume of water entering the berry relative to the volume of sugar, resulting in an increase in sugar concentration.
The accumulation of hexose sugars (glucose) is associated with the development of xylem cell discontinuities. This development of xylem cell discontinuities reduce the volume of water. This development of xylem cell is entering the berry relative to the volume of sugar concentration. The volume of sugar is resulting in an increase in sugar. Glucose is fructose.