Grape Composition under Abiotic Constrains: Water Stress and Salinity.

Area of Science:

• Viticulture and Oenology
• Plant Physiology
• Agricultural Science

Background:

• Water stress and soil salinity are major abiotic constraints affecting Mediterranean vineyards.
• Deficit irrigation strategies have shown potential to enhance grape composition.
• Saline water irrigation can negatively impact vineyard yield and grape quality.

Purpose of the Study:

• To review the effects of deficit irrigation and saline water irrigation on grape berry composition and wine quality.
• To analyze the variability in berry and wine attributes based on cultivar, rootstock, and water status.

Main Methods:

• A meta-analysis of published data for red and white grape varieties.
• Development of a general linear model to assess the impact of cultivar, rootstock, and midday stem water potential.

Main Results:

• The general linear model explained up to 90% of the variability in berry composition data.
• Berry weight, must titratable acidity, and pH were well-simulated across cultivars.
• Model fit for wine attributes was better for white cultivars compared to red.

Conclusions:

• Agronomic practices are needed to mitigate the negative effects of water stress and salinity on grape and wine quality.
• Cultivar, rootstock, and water potential are key factors influencing grape composition under stress conditions.
• Further research may be needed to optimize wine quality prediction models for red grape varieties.