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Research Article

Effects of Sunlight Exposure on Flavonol Content and Wine Sensory of the White Winegrape Grechetto Gentile

Gianluca Allegro, Chiara Pastore, Gabriele Valentini, Ilaria Filippetti
Am J Enol Vitic.  2019  70: 277-285  ; DOI: 10.5344/ajev.2019.17108
Gianluca Allegro
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
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Chiara Pastore
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
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Gabriele Valentini
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
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Ilaria Filippetti
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
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  • For correspondence: ilaria.filippetti@unibo.it
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Abstract

The aim of this research was to study the effect of sunlight exposure on the composition of white grapes and wine sensory attributes. In 2014 and 2015, vines of the white winegrape Grechetto gentile were subjected to cluster zone leaf removal (LR) after fruit set. Small-scale vinifications of Control and LR-treated grapes were conducted following a standardized protocol designed to identify differences in astringency and bitterness, and the relationship between these mouthfeel attributes and the concentrations of phenolic compounds was investigated. In both years, berry flavonols increased after cluster zone LR, and were also higher in the corresponding wines. Berry tannins showed only minor changes in response to the higher solar irradiance from LR and were not different in the wines. In 2014, wine from the LR-treated vines was judged to be more bitter and astringent, whereas no difference was found between wines of 2015. The higher concentration of flavonols may have contributed to the higher intensity of phenolic mouthfeel in the first year, whereas the very high pH and alcohol content of all the wines in the second year may have masked differences in perception of astringency and bitterness.

  • astringency
  • bitterness
  • cluster exposure
  • flavonol
  • leaf removal
  • tannin
  • Received November 2017.
  • Revision received May 2018.
  • Revision received October 2018.
  • Revision received January 2019.
  • Accepted February 2019.
  • Published online July 2019
  • ©2019 by the American Society for Enology and Viticulture
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You have accessRestricted access
Effects of Sunlight Exposure on Flavonol Content and Wine Sensory of the White Winegrape Grechetto Gentile
Gianluca Allegro, Chiara Pastore, Gabriele Valentini, Ilaria Filippetti
Am J Enol Vitic.  2019  70: 277-285  ; DOI: 10.5344/ajev.2019.17108
Gianluca Allegro
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
  • Find this author on Google Scholar
  • Find this author on PubMed
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Chiara Pastore
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Gabriele Valentini
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
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Ilaria Filippetti
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
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  • For correspondence: ilaria.filippetti@unibo.it

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Effects of Sunlight Exposure on Flavonol Content and Wine Sensory of the White Winegrape Grechetto Gentile
Gianluca Allegro, Chiara Pastore, Gabriele Valentini, Ilaria Filippetti
Am J Enol Vitic.  2019  70: 277-285  ; DOI: 10.5344/ajev.2019.17108
Gianluca Allegro
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Chiara Pastore
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Gabriele Valentini
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Ilaria Filippetti
1Department of Agricultural and Food Sciences, University of Bologna, viale Fanin 44, 40127, Bologna, Italy
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: ilaria.filippetti@unibo.it
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