Terroir 1996 banner
IVES 9 IVES Conference Series 9 Sviluppo vegetativo del Nebbiolo nell’area di produzione del Barolo DOCG: influenza sulla qualita’ della produzione

Sviluppo vegetativo del Nebbiolo nell’area di produzione del Barolo DOCG: influenza sulla qualita’ della produzione

Abstract

Environment features and management operations on shoot and leaves modify the canopy during the vegetative season, changing the grapevine microclimate and the ratio between photo synthetic sources (the canopy) and productive sinks (the grapes). The aim of the present study was to evaluate on several vineyards the evolution in the season of the canopy development, in order to relate the vegetative behavior of the vine with the quality of grapes at harvest. For two consecutive years canopy development was assessed on 30 Nebbiolo vineyards in the Barolo area, using the point quadrat method. Size and structure of the canopy were assessed in June and September. Yield and qualitative characteristics of the must were determined at harvest. Total leaf area measured at the end of the vegetative season was directly correlated with yield, but it was not correlated with sugars and phenolic accumulation in the grape. However, both sugar and phenolic content in the must were proportional to the increase in canopy area observed between June and September, which is affected by plant vigor and vineyard management techniques (e.g. topping). The results suggest that the quality of Nebbiolo grapes in the Barolo area is affected by environment-induced vigor on one side, and by canopy management on the other side.

DOI:

Publication date: March 2, 2022

Issue: Terroir 1998

Type: Article

Authors

CLAUDIO LOVISOLO (1), ANDREA SCHUBERT (2), ROCCO Dl STEFANO (3)

(1) Dipartimento di Colture arboree dell’Università di Torino
(2) Centro Miglioramento genetico e Biologia della Vite, CNR – Via Leonardo da Vinci, 44 – 10095 Grugliasco
(3) lstituto Sperimentale per l’Enologia, Sez. di Chimica enologica – Via P. Micca, 35 – 14100 Asti

Tags

IVES Conference Series | Terroir 1998

Citation

Related articles…

The impacts of frozen material-other-than-grapes (MOG) on aroma compounds of red wine varieties

An undesirable note called “floral taint” has been observed in red wines by winemakers in the Niagara region caused by large volumes of frozen leaves and petioles [materials-other-than-grapes (MOG)] introduced during mechanical harvest and subsequent winemaking late in the season. The volatiles, which we hypothesized are responsible, are primarily terpenes, norisoprenoids, and specific esters in frozen leaves and petioles. The purpose of this study was to investigate the volatile compounds which may cause the floral taint problem and explore how much of them (thresholds) may lead to the problem. Also, the glycosidic precursors of some of these compounds were analyzed to see the changes happening during frost events.

Aromatic profile of six different clones of Chardonnay grape berries in Minas Gerais (Brazil)

Aromas are one of the key points in food analysis since they are related to character, quality and consequently consumer acceptance. It is not different in the winery industry, where the aromatic profile is a combination of viticultural and oenological practices. Based on the development of more aromatic clones and on the potential to produce sparkling wines at Caldas, in the southern region of Minas Gerais (Brazil) (21°55´S and 46°23´W, altitude 1,100m), the aim of this work was the determination of volatile compounds in six different clones of Chardonnay grape berries to better understand which compounds add bouquet to the wine, and additionally comprehend the impacts of the edaphoclimatic and annual conditions on the improvement of grape-growing and winemaking practices.

Improving stilbenes in vitis Labrusca L. Grapes through methyl jasmonate applications

Grapes (Vitis sp.) are considered a major source of phenolic compounds such as flavonols, anthocyanins and stilbenes. Studies related to the beneficial effects of these compounds on health have encouraged research aimed at increasing their concentration in fruits. On this behalf, several plant growth regulators such as jasmonic acid and its volatile ester, methyl-jasmonate (MeJa), have demonstrated promising results in many fruits. However, Brazilian subtropical climate might interfere on treatment response. The present study aims to evaluate the application of MeJa in the pre-harvest period in Concord and Isabel Precoce grapes (Vitis labrusca L.).

Service crop effects on grapevine water and nitrogen status and yield under Mediterranean climate

Service crops in vineyard can provide multiple ecosystem services but they can also lead to competition with the grapevine for soil resources in the Mediterranean region due to potential severe droughts (Garcia et al., 2018). One of the levers of action to manage this competition is the choice of species adapted in terms of growth dynamics and water and nutrients’ needs. The objectives of this study were to determine the effect of temporary service crops on grapevine water and nitrogen status and grapevine yield and yield components in a Mediterranean vineyard.

Impact of deficit irrigation strategies on terpene concentration in Gewürztraminer grapes

Deficit irrigation is a viticultural practice often applied to improve the phenolic composition of red grapes and wines. However, the impact of this practice on grape terpenes – key aromatics for several grapes and wines – remains largely unknown. This study investigated the impact of deficit irrigation strategies on free and glycosylated terpenes in Gewürztraminer grapes. In a field study conducted in Oliver, BC, in 2016, 2017, and 2018, deficit irrigation regimes were applied to Gewürztraminer vines at different developmental stages (pre-veraison = Early Deficit, ED; post-veraison = Late Deficit, LD; throughout the season = Prolonged Deficit, PD). A well-irrigated control (CN) treatment was also established.