Terroir 2014 banner
IVES 9 IVES Conference Series 9 Rootstock impact on foliar symptom expression of esca on Vitis vinifera cv. Cabernet-Sauvignon

Rootstock impact on foliar symptom expression of esca on Vitis vinifera cv. Cabernet-Sauvignon

Abstract

Trunk diseases and esca in particular, represent a major threat to the sustainability of the vineyards. The percentages of unproductive vines in a plot could vary from 4% to over 20 % depending on local conditions and vintages. 

This syndrome is characterized both by foliar symptoms of variable intensity and internal symptoms in the grapevine wood. These necroses induce vascular disorders on vine trunk. Most survey networks or other monitorings of plot generally show that the levels of leaf symptom expression of esca may depend on the cultivar and the soil x climate under which this crop is grown. It has been also shown that soil has a major effect on water status of grapevine. And the interface between ground and vine is provided by the rootstock. The study presents the results of an experiment carried out in a plot of Cabernet-Sauvignon in the Bordeaux region with twelve repeats of four different rootstocks over four vintages. Data suggest that one of the four rootstocks tested significantly led to less foliar symptoms of esca under these conditions. Among the three other rootstocks, there were some differences that could be reversed depending on weather conditions of the year. 

This breakthrough could be considered as an extra-element to add to all the criteria required for choosing a rootstock.

DOI:

Publication date: August 18, 2020

Issue: Terroir 2014

Type: Article

Authors

JP Roby (1), S Mary (3), P Lecomte (2), and C Laveau (3)

(1) Univ. Bordeaux, ISVV, Bordeaux Sciences Agro, Ecophysiology and functional genomics of grapevines, UMR 1287, F-33140 Villenave d’Ornon, France 
(2) INRA, UMR1065 SAVE, Univ. Bordeaux, ISVV, BP 81, 33883 Villenave d’Ornon Cedex, France 
(3) Univ. Bordeaux, Vitinnov, ISVV, 1 cours du Général De Gaulle, 33170 Gradignan, France 

Contact the author

Keywords

esca, rootstock, soil effect, weather effect

Tags

IVES Conference Series | Terroir 2014

Citation

Related articles…

Effects of oak barrel aging monitored by 1H-NMR metabolomics

The study of wine evolution during barrel aging is an important aspect of wine quality. Our previous works have shown that wine metabolome monitoring by 1H-NMR approaches allows determining the impact of different winemaking processes including traitements using enzymes or finning agents [1].

GC-O and olfactoscan approaches to reveal premature aging markers in Chardonnay wine

Molecular markers of wine oxydation, such as sotolon or Strecker’s aldehydes that induce respectively nut or curry and boiled vegetables or wilted rose odors, can be percieved as a default by consumers. These volatile compounds are especially formed during the premature aging of wine, but it is likely that several contributing compounds are still unknown as is their combined contribution. This study was carried out to identify the markers of oxydation in Chardonnay wine by Gas Chromatography Olfactometry (GC-O) and to study the impact of these markers on the complex wine aromatic buffer using the Olfactoscan approach.A Chardonnay wine (2018-vintage), taken after malolactic fermentation without sulphites addition, was submitted to an artificial oxidation to simulate more or less prononced premature oxidation. Volatile compounds were extracted by Solid-Phase Extraction (SPE) and analysed by GC-O with a panel of 13 trained subjects. The same extract was also submitted to a second analysis based on the Olfactoscan technique, which allowed to evaluate the impact of each volatile compounds on the complex aromatic buffer of a non-oxidized wine delivered as background odor. Preliminary results revealed three types of behavior. On the one hand, several odor zones appeared only with the background odour, suggesting a synergy effect induced by the compounds in the aromatic buffer. Conversely, odor-active compounds could not be perceived within the background odor suggesting a masking effect. Finally several compounds were found to contribute as key odorants for wine oxydation once mixed with the aromatic buffer. These compounds are still to be identified using complementary techniques.

VOLATILE AND GLYCOSYLATED MARKERS OF SMOKE IMPACT: LEVELS AND PATTERNS OBSERVED IN 2020 WINES FROM THE UNITED STATES WEST COAST

Smoke impact in wines is caused by a wide range of volatile phenols found in wildfire smoke. These compounds are absorbed and accumulate in berries, where they may also become glycosylated. Both volatile and glycosylated forms eventually end up in wine where they can cause off-flavors, described as “smoky”, “bacon”, “campfire” and “ashtray”, often long-lasting and lingering on the palate. In cases of large wildfire events, economic losses for all wine industry actors can be devastating.

Zoning of potential landscape and environment potential of the «Appellation d’Origine Contrôlée Costières de Nîmes»

The Union defence of the “appellation Costières de Nîmes” hired a reflection on the future of its territory production in the interests of preservation and enhancement.

A new approach for sensory characterization of grape. Relationship with chemical composition

Characterize taste and mouthfeel properties of grapes elicited by the phenolic fraction (PF) of grape berries and establish relationships with chemical variables. METHODS: As many as 31 diverse grape lots of Tempranillo Tinto and Garnacha Tinta from three different regions were harvested. Grapes were destemmed and macerated in 15% of ethanol for one week and extracts were submitted to solid phase extraction. The recovered polyphenolic fraction was reconstituted in wine model and characterized by a panel of 21 wine experts employing a list of 23 taste and mouthfeel-related attributes following a rate-k-attributes methodology. RESULTS: Six significant attributes among the 31 samples differed based on ANOVA results: “dry”, “coarse”, “bitter”, “dry on tongue”, “sticky” and “watery”. PCA with VARIMAX algorithm was calculated.