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The relationship between grape berry Rh and backflow from the fruit into the parent plant. Flow rates were calculated using Rh and xylem water potential gradients (ΔΨx) between the fruit and the stem xylem. Four scenarios of diurnal time course of ΔΨx are shown (A–D) in the inset, with diurnal time courses in stem water potential based on data for irrigated postveraison vines from Greenspan et al. (1996). The black circles show mean whole berry Rh measured at 80 to 100 DAA.
