Resumen de Effect of pre‐ and post‐veraison water deficit on proanthocyanidin and anthocyanin accumulation during Shiraz berry development
Didier Ollé, J.L. Giraud, Jean-Marc Souquet, Nancy Terrier, Agnès Ageorges, Véronique Cheynier, Clotilde Verrieès
Background and Aims: Water deficit is known to influence berry development as well as flavonoid metabolism. The aim of this study was to investigate the influence of pre‐ and post‐veraison water stress on the proanthocyanidin and anthocyanin accumulation on berry samples selected at comparable physiological maturity, especially after veraison while avoiding sugar influence.
Methods and Results: Three irrigation treatments were applied by a drip irrigation system on three rows of 30 vines from an experimental Shiraz vineyard. Pre‐veraison water stress had no effect on total proanthocyanidin accumulation but increased accumulation of all anthocyanins except malvidin and p‐coumaroylated derivatives, whereas post‐veraison water stress enhanced the overall anthocyanin biosynthesis, particularly malvidin and p‐coumaroylated derivatives.
Conclusions: Pre‐ and post‐veraison water stress affected the anthocyanin composition differently, suggesting a differential regulation of the genes involved in the last steps of anthocyanin biosynthesis pathway.
Significance of the Study: The study identifies the effect of pre‐ and post‐veraison water stress while avoiding sugar influence on anthocyanin accumulation which could be maximised since both stresses differently impacted hydroxylation and methylation of anthocyanins.
