Abstract
Resveratrol-enriched wine is considered an interesting product with added value as a consequence of its numerous health properties. The purpose of this study was to determine the effect of different nitrogen foliar applications on the stilbene concentration of Tempranillo musts and wines. The nitrogen sources applied were proline, phenylalanine, urea, and two commercial nitrogen fertilizers, with and without amino acids in their formulation. Grapevines were sprayed at veraison and one week later. Stilbene concentration was higher in wines than in musts and there was a good correlation between the stilbene concentration in musts and wines. Results showed that urea treatment favoured resveratrol and piceid synthesis, since the application of this nitrogen compound increased stilbene concentration in musts and wines. Wines from phenylalanine treatment presented higher concentration of trans-piceid than control wines. However, proline and commercial nitrogen fertilizers treatments did not affect stilbene concentration in the must and wine samples. Consequently, foliar application of phenylalanine and urea to the vineyard could be used as a biostimulant for stilbene synthesis and therefore musts and wines with better health properties could be obtained.
- ©2015 by the American Society for Enology and Viticulture
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