terclim by ICS banner
IVES 9 IVES Conference Series 9 Ugni blanc berry and wine composition impacted by thirteen rootstocks

Ugni blanc berry and wine composition impacted by thirteen rootstocks

Abstract

The Cognac region is expanding, driven by the success of its renowned brandy and the demand for high grape yields to ensure a steady supply of base wine for distillation. Ugni blanc, the most widely planted grape variety, relies on rootstocks for soil and climate adaptation, providing essential nutrient supplies to the scion. Understanding the impact of rootstocks on key berry components, such as sugars and nitrogen compounds, is crucial. These compounds serve as primary precursors for the production of fermentative aroma metabolites, which, in turn, act as quality indicators for eau-de-vie.

This study was conducted in 2021 in the GreffAdapt plot (55 rootstocks x 5 scions x 3 blocks) on cv. Ugni blanc (Marguerit et al. 2019). The effects of thirteen selected rootstocks were evaluated on various viticultural parameters as well as berry composition including detailed amino acid profiles at harvest and fermentative volatile contents of the corresponding wines, fermented under standardized conditions similar to Cognac base wine elaboration.

Among all the parameters measured, rootstock effects outweighed block effects, with significant variations in vigor observed. In 2021, low to no water deficit conditions were found. Significant differences between sugar and nitrogen compound levels in the must were observed between rootstocks with low sugar levels, typical for Cognac base wine production. Differences in amino acid concentrations and proportions were substantial leading to wine with distinct aroma profiles with 333EM and Evex13-5 having the highest concentration of higher alcohol acetate (> 3 mg/L) while RSB and Gravesac had the lowest (~ 2.8 mg/L). Although the connection between vine characteristics and wine volatiles was not apparent, aroma composition appeared linked to must composition, necessitating further investigation.

Acknowledgements: The authors would like to thank the Experimental Viticultural Unit of Bordeaux 1442, INRAE, F- 33883 Villenave d’Ornon, for its contribution with the setting up of the GreffAdapt experimental vineyard.

Download the abstract

DOI:

Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Article

Authors

Julia Gouot1,2,3*, Laura Farris1,2, Marine Morel4, Nicolas Le Menn1,2, Xavier Poitou3, Mathilde Boisseau3, Elisa Marguerit4, Jean-Christophe Barbe1,2

1Univ. Bordeaux, Bordeaux INP, INRAE, OENO, UMR 1366, ISVV, F-33140 Villenave d’Ornon, France
2Bordeaux Sciences Agro, Bordeaux INP, INRAE, OENO, UMR 1366, ISVV, F-33170 Gradignan, France
3R&D Department, JAS Hennessy & Co, Cognac, France
4EGFV, Univ. Bordeaux, Bordeaux Sciences Agro, INRAE, ISVV, F-33882, Villenave d’Ornon, France

Contact the author*

Keywords

Amino acids, Aroma compounds, Ugni blanc, Rootstock, Yield

Tags

IVES Conference Series | Open GPB | Open GPB 2024

Citation

Related articles…

Comparison between the volatile chemical profile of two different blends for PDO “Valpolicella Superiore”

Valpolicella is a famous wine producing region located in the north of Verona close to Garda lake and owes its fame above all to the production of two Protected Designation of Origins (PDOs) withered wines: Amarone and Recioto. Nowadays the production of another PDO, Valpolicella Superiore is gaining more attention by the consumers, increasing the interest of the wineries to improve the quality of this wines

Read More

Population-wide diversity study in Lachancea thermotolerans highlights superior starters for winemaking

Grapes from warm(ing) climates often contain excessive sugars but lack acidity. This can lead to highly alcoholic wines with compromised stability and balance. The yeast Lachancea thermotolerans can ameliorate such wines due to its metabolic peculiarity – partial fermentation of sugars to lactic acid. This study aimed to elucidate the population-wide diversity in L. thermotolerans, whilst selecting superior strains for wine sector. An extensive collection of isolates (~200) sourced from different habitats worldwide was first genotyped on 14 microsatellite loci. This revealed differentiation of L. thermotolerans genetic groups based on the isolation substrate and geography. The 94 genotyped strains were then characterised in Vitis vinifera cv. Chardonnay fermentations.

Read More

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.

Read More

The inhibition of hydrogen sulfide and methanethiol accumulation in wine by Cu(II): The influence of temperature on the duration of protection

Hydrogen sulfide and methanethiol are recognised as two of the most significant contributors to reductive off-flavours in wine.

Read More

NADES extraction of anthocyanins derivatives from grape pomace

Grape pomace is one of the main by-products generated after pressing in wine-making. It’s valorization through the extraction of bioactive compounds is the answer for the development of sustainable processes. Nevertheless, in the recovery of anthocyanins derivatives, the extraction stage continues to be a limiting step. The nature of the sample and the type of solvent determine the efficiency of the process

Read More