terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Detoxification capacities of heavy metals and pesticides by yeasts 

Detoxification capacities of heavy metals and pesticides by yeasts 

Abstract

Winegrowing is still characterized by the extensive use of chemical fertilizers and plant protection products, despite strong recommendations to limit these practices. A part of these xenobiotics and metals are then found in grape juice and wine, causing a major health concern, as well as negatively affecting the fermentation process. In recent years, there has been renewed interest in non-Saccharomyces yeasts. These species have a wide phenotypic diversity, which would be exploited to broaden the aromatic palette of wines. The potential of some of these species as a bio-protection agent, in pre-fermentation treatment, has also been established.

In addition to these characteristics, the heavy metal sorption capacities of these species are mentioned in the literature. Pre-fermentation treatment of the harvest with non-Saccharomyces (NS) yeasts therefore appears to be an alternative to the use of chemical inputs for the elimination of organic and inorganic xenobiotics from grape musts. However, our knowledge of the detoxification capacities of yeasts and their molecular and biochemical determinant is not yet sufficiently advanced to allow such methods to be developed and put into practice.  In this study, we investigated the detoxifying abilities of fourteen strains of Saccharomyces and non-Saccharomyces yeasts during the first stages of wine fermentation. Fermentations were conducted in synthetic must in the presence or absence of pesticides (mix of twenty pesticides commonly used in the vineyard) / metals (copper). The colorimetric determination of copper concentration throughout fermentation revealed that most Saccharomyces and non-Saccharomyces yeasts detoxify almost all copper in less than 48 hours. Regarding pesticides detoxification, quantified by GC-MS (Dubernet laboratory), a higher variability was observed, with a removal of 0% to 90% of the compound depending on the yeast strain and the pesticide. In conclusion, this study showed the great diversity of the capacity of yeasts to detoxify molecules used in vineyards to fight against diseases and/or parasites and the biotechnological potential that this represents.

DOI:

Publication date: October 3, 2023

Issue: ICGWS 2023

Type: Article

Authors

Tristan Jacqui1,2, Celine Raynal2, Amandine Deroite2, Vincent Bouazza3 , Carole Camarasa1

1SPO, INRAe, Institut Agro Montpellier, Montpellier, France
2LALLEMAND SAS, Blagnac, France

3Laboratoire Dubernet, Narbonne, France

Contact the author*

Keywords

non-Saccharomyces yeasts, wine quality, heavy metals, pesticides, detoxification

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Analysis of volatile composition of interaction between the pathogen E. necator and two grapevine varieties

Volatile organic compounds (VOCs) are emitted by nearly all plant organs of the plants, including leaves. They play a key role in the communication with other organisms, therefore they are involved in plant defence against phytopathogens. In this study VOCs from grapevine leaves of two varieties of Vitis vinifera infected by Erysiphe necator were analysed. The varieties were selected based on their susceptibility to pathogen, Kishmish Vatkana has the Ren1 resistance gene and Zamarrica showed high susceptibility in previous trials.

Acceptability of canned wines: effect of the level of involvement of consumers and type of wine

In recent years there has been a growing demand for alternative packaging designs in the food industry focused on diminishing the carbon footprint. Despite the environmental advantages of cans versus bottles, the traditional environment of wine has hindered the establishment of less contaminant containers. In this context, the objective of this study was to understand and generate knowledge about consumers´ perception of canned wines in comparison to bottled wines.

Physicochemical behaviour of wine spirit and wine distillate aged in Sherry Casks® and Brandy casks

Brandy is a spirit drink made from “wine spirit” (<86% Alcohol by Volume – ABV; high levels of congeners and they are mainly less volatile than ethanol), it may be blended with a “wine distillate” (<94.8%ABV; low levels of congeners and these are mainly more volatile than ethanol), as long as that distillate does not exceed a maximum of 50% of the alcoholic content of the finished product[1]. Brandy must be aged for at least 6 months in oak casks with <1000L of capacity. During ageing, changes occur in colour, flavour, and aroma that improve the quality of the original distillate.

Optimization of the ripening time of new varieties descendants of Monastrell

Given the impact of climate change on viticulture in the Region of Murcia, this paper attempts to expose the possibility of using genetic improvement as a dilemma that allows access to new descendant varieties of the autochthonous variety Monastrell crossed with varieties such as Syrah and Cabernet. Sauvignon, thus obtaining hybrids (Gebas and Myrtia). In it, the chromatic parameters and the phenolic profile of the new varieties will be compared with those obtained by the Monastrell variety at two moments during maturation (12 and 14 º Baumé), to check if the results would allow earlier harvests in these new varieties thus avoiding the decoupling between phenolic and technological maturity, while improving the quality of grapes and wines.

Conventional and alternative pest management strategies: a comparative proteomic study on musts

In a context of sustainable agriculture, “agroecological immunity” is an emerging concept to reduce the use of chemical pesticides to protect crops against pathogens. This alternative strategy aims to combine different levers including the use of “bio”solutions. These include biocontrol products, some of which being plant defense elicitors, as well as products authorized in organic farming such as copper or sulfur. In vineyards, depending on climate conditions, powdery and downy mildews can be devastating diseases.