Irrigation Regime Effects on Phenolic Composition of Portuguese Grape Varieties
2025
Daniela Fonseca | Rosario Sánchez-Gómez | M. Rosario Salinas | Maria João Cabrita | Nuno Martins | Raquel Garcia | Cristina Cebrián-Tarancón
Climate change has led to increased extreme weather events, such as severe droughts and intense rainfall, with regions in Portugal, like Alentejo and Algarve, being particularly affected. Understanding the influence of water availability in the concentration of phenolic compounds in autochthonous varieties could be an important tool to know how these varieties adapt to water scarcity. This work has been carried out with the aim to analyze the profile of phenolic compounds by HPLC-DAD in four Portuguese grape varieties (Tinta Gorda, Tinta Miú:da, Tinta Caiada, and Moreto), cultivated under three irrigation regimes (water comfort, moderate water deficit, and rainfed). The results reveal that Tinta Gorda, Tinta Miú:da, and Tinta Caiada varieties exhibit the higher concentrations of phenolic compounds under rainfed conditions. Among these, Tinta Miú:da and Tinta Caiada stand out as the most promising varieties in terms of adaptability to water scarcity.
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