Journal
FOOD CHEMISTRY
Volume 180, Issue -, Pages 171-180Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.02.042
Keywords
Grape; Anthocyanins; Flavonols; Nitrogen; Vitis vinifera L.; Tempranillo
Funding
- Gobierno de La Rioja [R-08-13]
- Gobierno de La Rioja
- INIA-Gobierno de La Rioja
- Fondo Social Europeo
- Junta de Comunidades de Castilla-La Mancha through the INCRECYT program
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Grapevines may require the input of nitrogen to grow and to guarantee an appropriate grape composition. Recently there has been a growing interest in foliar fertilization, which entails a fast and efficient assimilation of the products. The aim of this work was to study the influence of foliar applications of phenylalanine and urea, at two different doses, on grape anthocyanins, flavonols, flavan-3-ols, phenolic acids, and stilbenes. All treatments were applied at veraison and one week later at doses of 0.9 and 1.5 kg N/ha. The results showed that the synthesis of phenolic compounds was favoured by foliar applications of phenylalanine and urea. The application of the lowest dose of urea was the most effective treatment, increasing the content of several anthocyanins and flavonols. Moreover, none of the foliar treatments worsened the grape phenolic composition. In conclusion, foliar application of phenylalanine and especially urea, could be an interesting management tool for improving grape quality and their health-promoting properties. (C) 2015 Elsevier Ltd. All rights reserved.
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