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Genetic variability and physiological traits of Saccharomyces cerevisiae strains isolated from “Vale dos Vinhedos” vineyards reflect agricultural practices and history of this Brazilian wet subtropical area

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Abstract

Vale dos Vinhedos appellation of origin has a very recent history as industrial wine making region. In this study we investigated the genetic and phenotypic variability of Saccharomyces cerevisiae strains isolated from South-Brazilian vineyards in order to evaluate strain fermentation aptitude and copper and sulphites tolerance. Merlot grape bunches were collected from three vineyards and yeast isolation was performed after single bunch fermentation. High genotypic variability was found and most of the genotypes revealed to be vine-specific. No industrial strain dissemination was present in the sampled vineyards, although it has been wildly reported in traditional winemaking countries. From the phenotypic traits analysis these Brazilian native strains showed good fermentation performances, good tolerance to sulphites and, in particular, a high copper tolerance level. Copper is the most important metal in the formulation of fungicides against downy mildew (Plasmopara viticola), one of the most harmful disease of the vines, and other fungal pests. The high tolerance to copper suggests an environmental adaptation to the strong use of copper-based fungicides, requested by the wet subtropical climate.

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Abbreviations

SA:

Sampling area

GD-SO2 :

Growth decrease due to sulphur dioxide

GD-CuSO4 :

Growth decrease due to copper sulphate

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Acknowledgements

This study was partially funded by MIUR (Ministero dell’Istruzione dell’Università e della Ricerca, project 60A08-9152/11). The authors gratefully acknowledge Miss Fernanda Herter (ittNUTRIFOR, Unisinos) and Dr Luciano Alves (ittNUTRIFOR, Unisinos) for technical support in performing HPLC analysis and fermentation trials. The winemaking company Vinícola Miolo (Vale dos Vinhedos, Bento Goncalves, RS, Brazil) is acknowledged for providing the vineyards for the sampling campaign.

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Correspondence to Alessio Giacomini.

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Crosato, G., Carlot, M., De Iseppi, A. et al. Genetic variability and physiological traits of Saccharomyces cerevisiae strains isolated from “Vale dos Vinhedos” vineyards reflect agricultural practices and history of this Brazilian wet subtropical area. World J Microbiol Biotechnol 34, 105 (2018). https://doi.org/10.1007/s11274-018-2490-z

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  • DOI: https://doi.org/10.1007/s11274-018-2490-z

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