WAC 2022 banner
IVES 9 IVES Conference Series 9 WAC 9 WAC 2022 9 3 - WAC - Oral 9 Brettanomyces bruxellensis, born to live

Brettanomyces bruxellensis, born to live

Abstract

The wine spoilage yeast Brettanomyces bruxellensis can be found at several steps in the winemaking process due to its resistance to multiple stress conditions. Among the resistance strategies, one could be the formation of biofilm, a lifestyle known to enhance persistence of microorganisms. In this study, we propose to characterize biofilm of B. bruxellensis in wine, especially through several microscopic analyses.

The capacity of the yeast to colonize supports was demonstrated, notably in wine. When biofilms developed on stainless steel chips were inoculated in wine, a considerable cell release from chip into wine was induced, followed by a growth of planktonic cells able to produce wine spoilage metabolites, such as 4-ethylphenol.

Besides the ability to form biofilm, B. bruxellensis is also able to display different cell morphologies, as demonstrated by microscopic observations. First, filaments were observed, playing a role in the structure of biofilm. For the first time, chlamydospore-like was described in this species, probably a potential additional resistance strategy. In addition, a polymorphism of vegetative cells was revealed. Using image analysis, we have shown that strains having different genotyping presented different morphology. Based on this link, a deep learning method was adapted to predict the genetic group of a strain from a simple microscopic observation.

Taken together, all of these features and strategies lead B. bruxellensis to persist in environment and to contaminate wine. Moreover, morphology of vegetative cells could be newly considered as indicator of a strain resistance capacity since the sensitivity to SO2 depend on the strain genetic group.

DOI:

Publication date: June 13, 2022

Issue: WAC 2022

Type: Article

Authors

Manon LEBLEUX, Emmanuel Denimal, Hany ABDO, Christian COELHO, Louise Basmaciyan, Hervé Alexandre, Stéphanie Weidmann, Sandrine ROUSSEAUX

Presenting author

Manon LEBLEUX – Université Bourgogne Franche-Comté, AgroSup Dijon, PAM UMR A 02.102 Dijon-France. Laboratoire VAlMiS-IUVV

Agrosup Dijon, Direction Scientifique, Appui A La Recherche, 26 Boulevard Docteur Petitjean, Dijon, F-21000, France, Laboratoire Valmis-IUVV | Université Bourgogne Franche-Comté, Agrosup Dijon, PAM UMR A 02.102 Dijon-France. Laboratoire PCAV | Université Bourgogne Franche-Comté, Agrosup Dijon, PAM UMR A 02.102 Dijon-France. Laboratoire Valmis-IUVV

Contact the author

Keywords

Brettanomyces bruxellensis – wine spoilage – biofilm – morphology – deep learning

Tags

IVES Conference Series | WAC 2022

Citation

Related articles…

Monitoring vineyard canopy structure by aerial and ground-based RGB and multispectral imagery analysis

Unmanned Aerial Vehicles (UAVs) are increasingly used to monitor canopy structure and vineyard performance. Compared with traditional remote sensing platforms (e.g. aircraft and satellite), UAVs offer a higher operational flexibility and can acquire ultra-high resolution images in formats such as true color red, green and blue (RGB) and multispectral. Using photogrammetry, 3D vineyard models and normalized difference vegetation index (NDVI) maps can be created from UAV images and used to study the structure and health of grapevine canopies. However, there is a lack of comparison between UAV-based images and ground-based measurements, such as leaf area index (LAI) and canopy porosity.

Screening of hydroxytyrosol and tyrosine related metabolites in commercial wines by an UHPLC/MS validated method.

Hydroxytyrosol (HT) is a bioactive phenolic compound with antioxidant activity. Yeast synthetise tyrosol from tyrosine by the Ehrlich pathway which is subsequently hydroxylated to HT. The aim of the present work is to develop and validate an UHPLC–HRMS method to assess the metabolites involved in this pathway as well as to screen Spanish commercial wines for HT bioactive compound.

Exploring the dynamic between yeast mannoproteins structure and wine stability

Mannoproteins are macromolecules found on the surface of yeast cells, composed of hyperbranched polysaccharide negatively charged chains by mannosyl-phosphate groups, fixed to a protein core. during the alcoholic fermentation and aging on lees, these mannoproteins are released from the yeast cell wall and become the main yeast-sourced polysaccharide in wine. due to their techno-functional properties, commercial preparations of mannoproteins can be used as additives to better assure tartaric and protein stability.

Temperature-based phenology modelling for the grapevine 

Historical phenology records have indicated that advances in key developmental stages such as budburst, flowering and veraison are linked to increasing temperature caused by climate change. Using phenological models the timing of grapevine development in response to temperature can be characterized and projected in response to future climate scenarios.
We explore the development and use of grapevine phenological models and highlight several applications of models to characterize the timing of key stages of development of varieties, within and between regions, and the result of projections under different climate change scenarios.

Understanding aroma loss during partial wine dealcoholization by vacuum distillation

Dealcoholization of wine has gained increasing attention as consumer preferences shift toward lower-alcohol or
alcohol-free beverages. This process meets key demands, including health-conscious lifestyles, regulatory
compliance, and the expanding non-alcoholic market [1-3].