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…

Physiological and growth reaction of Shiraz/101-14 Mgt to row orientation and soil water status

Advanced knowledge on grapevine row orientation is required to improve establishment, management and outcomes of vineyards on terroirs with different environmental conditions (climate, soil, topography) and in view of a future change to more extreme climatic conditions. The purpose of this study was to determine the combined effect of row orientation, plant water status and ripeness level on the physiological and viticultural reaction of Shiraz/101-14 Mgt.

Effects of mechanical leafing and deficit irrigation on Cabernet Sauvignon grown in warm climate of California

San Joaquin Valley accounts for 40% of wine grape acreage and produces 70% of wine grape in California. Fruit quality is one of most important factors which impact the economical sustainability of farming wine grapes in this region. Due to the recent drought and expected labor cost increase, the wine industry is thrilled to understand how to improve fruit quality while maintaining the yield with less water and labor input. The present study aims to study the interactive effects of mechanical leafing and deficit irrigation on yield and berry compositions of Cabernet Sauvignon grown in warm climate of California.

The effects of cane girdling on berry texture properties and the concentration of some aroma compounds in three table grape cultivars

The marketability of the table grapes is highly influenced by the consumer demand; therefore the market value of the table grapes is mainly characterized by its berry size, colour, taste and texture. Girdling could cause accumulation of several components in plants above the ringing of the phloem including clusters and resulting improved maturity. The aim of the experiments was to examine the effect of girdling on berry texture characteristics and aroma concentration.

Application of a fluorescence-based method to evaluate the ripening process and quality of Pinot Blanc grape

The chemical composition of grape berries at harvest is one of the most important factors that should be considered to produce high quality wines. Among the different chemical classes which characterize the grape juice, the polyphenolic compound, such as flavonoids, contribute to the final taste and color of wines. Recently, an innovative non-destructive method, based on chlorophyll fluorescence, was developed to estimate the phenolic maturity of red grape varieties through the evaluation of anthocyanins accumulated in the berry skin. To date, only few data are available about the application of this method on white grape varieties.

Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Yields in the novel viticulture training system Semi-Minimal-Pruned Hedge (SMPH) are generally higher compared to the traditional Vertical Shoot Positioning (VSP). Excessive yields have a negative impact on the vine and wine quality, which can result in substantial losses in yield in subsequent vintages (alternate bearing) or penalties in fruit quality. Therefore yield regulation is essential. The bunch architecture in SMPH differs from VSP. Generally there is a higher amount but smaller bunches with lower single berry weights in SMPH compared to VSP.