Response of skin phenolic composition to irrigation treatments at harvest. Each compound was evaluated on a concentration (mg/g) and content (mg/berry) basis. Anthocyanins are in malvidin-3-glucoside equivalents. Tannins and iron-reactive phenolics (IRPs) are in catechin equivalents. Means ± 1 standard error (SE; n = 3) were calculated for main effects only. Trend analyses for preveraison deficit (ED) and postveraison deficit (LD) trends were conducted on treatments arranged according to water application and excluding dry control (DC) (i.e., ED: WC-ED75-ED50-ED25 and LD: WC-LD75-LD50-LD25), where WC is well-watered control: vines were irrigated at 100% vine evapotranspiration (ETc) during both pre- and postveraison; the number within each treatment notation (75, 50, and 25) indicates the irrigation rate in % ETc that the vines received either pre- (ED) or post- (LD) veraison. The vines were irrigated at 100% ETc for the rest of the season. Breakdown of each pre- and postveraison treatment is detailed in Table 1. ANOVA, analysis of variance.
