WAC 2022 banner
IVES 9 IVES Conference Series 9 WAC 9 WAC 2022 9 1 - WAC - Posters 9 Vineyard management strategies adopted to mitigate the impacts of climate change affect the evolution of phenolics and color during bottle aging of Aglianico wines

Vineyard management strategies adopted to mitigate the impacts of climate change affect the evolution of phenolics and color during bottle aging of Aglianico wines

Abstract

In recent years several strategies have been proposed to cope with the effect of climate change on grape berry quality but only a few studies have dealt with the influence of management practices implemented in the field (e.g. irrigation,summer pruning, etc.), on the evolution of wines over time. 
Three irrigation treatments (I0,I50,I100) and three shoot trimming treatments (T0,T30,T75) were applied to Aglianico grapevines for two consecutive years(2017 and 2018), thus resulting in nine experimental samples, namely T0I0, T0I50, T0I100, T30I0, T30I50, T30I100, T75I0, T75I50, T75I100. The grapes were harvested and vinified separately, the vinifications were standardized and, after stabilization, the wines obtained were bottled and aged in controlled conditions. Apart from base parameters of grapes and wines, the phenolic composition of hydroalcoholic extracts derived from skins, grape seeds and wines were determined just after the end of vinification and after a long bottle aging (4 and 5 years). Likewise, the chromatic characteristics of wines were analysed as well.
Berry soluble solid content and alcohol concentration in wines turned out to be reduced by shoot trimming and deficit irrigationin eitherseason. However, these effects were enhanced in the first year of treatment. Severe shoot trimming treatment induced a significant decrease in the amount of tannins extractable from skin and seeds that reached a reduction of 83% in grapes under severe water deficit and severe shoot trimming in 2017. Both treatments determined a decrease in anthocyanins extractable from grape skins (never above 17%) determining a significant effect also on color intensity and hue in the wines of both the 2017 and 2018 vintages. The vintage drastically influenced the amount of flavanols and tannins but the effect of the trimming treatment was comparable. Although the great production of polymeric pigments over time in all wines, the effect detected on grapes and wines just after fermentation is still evident for color intensity,tannins and vanillin index after bottle aging.
The results obtained in this work showed that, apart from the expected effect on soluble solids of grapes and alcohol content of wines, a strong effect of shoot trimming on tannins and vanillin index was detected. If further confirmed by other experiments, the trimming could be an interesting practice for the production of wines with lower amounts of tannins and, likely, less astringent.

DOI:

Publication date: June 13, 2022

Issue: WAC 2022

Type: Article

Authors

Antonio, Guerriero, Boris, Basile, Alessandro, Mataffo, Antonio, Dente, Martino, Forino, Antonio, Guerriero, Luigi, Picariello, Massimo, Di Renzo, Pasquale, Scognamiglio, Daniela, Strollo, Luigi, Moio, Angelita Gambuti

Presenting author

Antonio, Guerriero – University of Naples Federico II

University of Naples Federico II | Mastroberardino Spa

Contact the author

Keywords

Aglianico, vineyard strategies, climate change, bottle aging, phenolics

Tags

IVES Conference Series | WAC 2022

Citation

Related articles…

FACTORS AFFECTING QUERCETIN SOLUBILITY IN SANGIOVESE RED WINE: FIRST RESULTS

Quercetin (Q) is present in grape in form of glycosides and as aglycone. These compounds are extracted from grape skins during winemaking. In wines, following the hydrolysis reactions, the amount of quercetin aglycon can exceed its solubility value. Unfortunately, a threshold solubility concentration for quercetin in wine is not easy to determine because it depends on wine matrix (Gambuti et al., 2020).

Loose clustered vignoles clones reduce late season fruit rots

‘Vignoles’ is an aromatic, white-fruited wine grape variety valued by growers and wineries in the Eastern United States. Vignoles is grown in diverse locations in New York, Missouri, Indiana, Ohio, Pennsylvania, Illinois, Nebraska and Michigan. Consumers recognize and value the variety for its special wine quality.

Basic Terroir Unit (U.T.B.) and quality control label for honey; making the designations of origin (A.O.C) and« crus » more coherent

Considérant d’une part la judicieuse mise au point d’un label de qualité contrôlée des miels suisses (STÖCKLI et al. 1997), considérant d’autre part l’élaboration d’une carte des paysages végétaux (HEGG et al. 1993),

Influence of organic plant treatment on the terroir of microorganisms

Several factors like vineyard site, climate, grape variety, ripeness, physical health of the grapes and pest management influence the populations of indigenous yeasts on grapes and later on in spontaneous fermentations.

Distribution of photosynthates towards the grapes: effects of leaf removal and cluster thinning applied before veraison in cv. Verdejo

The relationship between grape production and leaf surface is a highly debated aspect in terms of the impact it may have on the composition and quality of grapes, especially in areas that focus their cultivation on high-quality wine. In many occasions, the limitation of the unitary production level in these areas is claimed to be the main factor for achieving high quality levels in the wine, forgetting the importance of the source-sink relationship and other environmental factors and management of the canopy. Taking this consideration into account, this work seeks to know the response of the vine as a whole, and the individual shoot as well, to the application of various alternatives of leaves and clusters removal, carried out in the phase immediately before veraison, in cv. Verdejo, in Spain.