Water stress and abscisic acid exogenous supply produce differential enhancements in the concentration of selected phenolic compounds in Cabernet Sauvignon

QUIROGA ANDREA MARIELA; DEIS LEONOR; CAVAGNARO JUAN BRUNO; BOTTINI RUBEN; SILVA MARIA FERNANDA

Journal of Berry Research

IOS

Año: 2011

1878-5093

Abstract. The production of grapevine secondary metabolites can be magnified by abiotic stresses or exogenous abscisic acid.Selected phenolic compounds were determined in grape and wine by gas chromatography/mass spectrometry with the aim toasses the physiological responses of plants submitted to water stress and hormonal treatments. Exogenous abscisic acids as wellas postveraison water stress produce differential enhancements on phenolic accumulation on Cabernet Sauvignon grapes and sucheffects were reflected in wine. Resveratrol and malvidin were enhanced by both abscisic acid and water stress and the improvementproduced by such factors was additive. On the other hand, the synthesis of gallic acid, (+) catechin, quercetin and caffeic acidwas not stimulated by water deficit. Combined hormonal-water stress treatments produced three positive effects on wine quality;a) increments of blue compounds, b) increments of flavonols and flavan 3-oles that favor copigmentation of wines, c) higherantioxidant compounds concentration with the consequent health benefits.