Changes on grape phenolic composition induced by grapevine foliar applications of phenylalanine and urea

  1. Portu, J. 1
  2. López-Alfaro, I. 1
  3. Gómez-Alonso, S. 23
  4. López, R. 1
  5. Garde-Cerdán, T. 1
  1. 1 Instituto de Ciencias de la Vid y del Vino
    info

    Instituto de Ciencias de la Vid y del Vino

    Logroño, España

    ROR https://ror.org/01rm2sw78

  2. 2 Universidad de Castilla-La Mancha
    info

    Universidad de Castilla-La Mancha

    Ciudad Real, España

    ROR https://ror.org/05r78ng12

  3. 3 Parque Científico y Tecnológico de Albacete, Paseo de la Innovación, 1, Albacete, Spain
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Revista:
Food Chemistry

ISSN: 0308-8146

Any de publicació: 2015

Volum: 180

Pàgines: 171-180

Tipus: Article

DOI: 10.1016/J.FOODCHEM.2015.02.042 SCOPUS: 2-s2.0-84923254437 WoS: WOS:000351961800022 GOOGLE SCHOLAR

Altres publicacions en: Food Chemistry

Resum

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. © 2015 Elsevier Ltd. All rights reserved.