terclim by ICS banner
IVES 9 IVES Conference Series 9 Mesoclimate impact on Tannat in the Atlantic terroir of Uruguay

Mesoclimate impact on Tannat in the Atlantic terroir of Uruguay

Abstract

The study of climate is relevant as an element conditioning the typicity of a product, its quality and sustainability over the years. The grapevine development and growth and the final grape and wine composition are closely related to temperature, while climate components vary at mesoscale according to topography and/or proximity to large bodies of water. The objective of this work is to assess the mesoclimate of the Atlantic region of Uruguay and to determine the effect of topography and the ocean on temperature and consequently on Tannat grapevine behavior. For this purpose, an automatic weather station and a network of 19 temperature sensors were installed in 2018 in plots of a commercial vineyard in contrasting topographic situations. Nine sensors correspond to Tannat plots. Based on the climatic data for 2018-19 and 2019-20 growing seasons, bioindicators for grapevine were calculated and relationships between site topography and plant response were analyzed. Temporal climate variability between the two growing seasons is explained by rainfall and spatial variability was associated with plots’ topography. Altitude was the main feature that statistically differentiated the plots’ temperature. The effect was observed on thermal amplitude, Cool Night Index, number of days above 30 °C and maximum summer temperature. During the summer of the warmest growing season (2019-20), at 14:00 LH the average thermal difference was -1.7 °C in favor of higher altitude (140 masl) compared to lower altitude (70 masl). The main factor conditioning this result was the ocean proximity and exposure to sea breeze air circulation. Plots in higher elevations favored grapes with higher malic acid content, while lower elevations showed berries with higher amounts of secondary metabolites. This study provides knowledge about Tannat behavior under ocean condition and in a complex region which could be of value to adapt sustainable viticulture techniques.

DOI:

Publication date: May 31, 2022

Issue: Terclim 2022

Type: Article

Authors

Ramiro Tachini1, Milka Ferrer1, Valérie Bonnardot2, Martin Fanzone3 and Mercedes Fourment1

1Facultad de Agronomía, Universidad de la República Oriental del Uruguay. Montevideo, Uruguay
2University Rennes 2, LETG-UMR 6554 CNRS, Rennes, France
3Estación Experimental Agropecuaria Mendoza, Instituto Nacional de Tecnología Agropecuaria (INTA), Mendoza, Argentina

Contact the author

Keywords

mesoclimate, South America, Oceanic wine region, Tannat, grape composition

Tags

IVES Conference Series | Terclim 2022

Citation

Related articles…

Use of Fourier Transform Infrared Spectroscopy (FTIR) to rapidly verify the botanical authenticity of gum arabic

Gum arabic is composed of a polysaccharide rich in galactose and arabinose along with a small protein fraction [1, 2], which gives its stabilizing power with respect to the coloring substances or tartaric precipitation of bottled wine. It is a gummy exudation from Acacia trees; the products used in enology have two possible botanical origins, i.e. Acacia seyal and Acacia senegal, with different chemical-physical features and consequently different technological effects on wines. The aim of this work is to evaluate the feasibility of discrimination of commercial gums Arabic between their two different sources, on the basis of the absorption of the Fourier Transform Infrared (FT-IR) spectra of their aqueous solutions, in order to propose an extremely rapid and cost-saving method for quality control laboratories.

The state of the climate

The climate has warmed over the past century or more bringing about changes in numerous aspects in both earth and human systems

Melatonin priming retards fungal decay in postharvest table grapes 

Postharvest losses of fruits may reach in some cases 40% in developed countries. This food waste has a significant carbon footprint and makes a major contribution toward greenhouse gas emissions so sustainable postharvest strategies are being investigated.
Melatonin, a well-known mammalian neurohormone, has been investigated as a priming agent to slow down fungal decay progression in postharvest climacteric and some non-climacteric fruits. However, the molecular and metabolic mechanisms responsible for such enhancement of disease tolerance are largely unknown.

LARGE-SCALE PHENOTYPIC SCREENING OF THE SPOILAGE YEAST BRETTANOMYCES BRUXELLENSIS: UNTANGLING PATTERNS OF ADAPTATION AND SELECTION, AND CONSEQUENCES FOR INNOVATIVE WINE TREATMENTS

Brettanomyces bruxellensis is considered as the main spoilage yeast in oenology. Its presence in red wine leads to off-flavour due to the production of volatile phenols such as 4-vinylphenol, 4-vinylguaiacol, 4-ethylphenol and 4-ethylguaiacol, whose aromatic notes are unpleasant (e.g. animal, leather, horse or pharmaceutical). Beside wine, B. bruxellensis is commonly isolated from beer, kombucha and bioethanol production, where its role can be described as negative or positive. Recent genomic studies unveiled the existence of various populations.

Analysis of climate spatio-temporal variability in the Conegliano-Valdobbiadene DOCG wine district

Local climate characterization is fundamental in terroir description, yet global change perspectives raise questions about its feasibility, since temporal stability cannot be no more assumed for the forthcoming years.