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Mycology

Molecular Characterization of New Natural Hybrids of Saccharomyces cerevisiae and S. kudriavzevii in Brewing

Sara S. González, Eladio Barrio, Amparo Querol
Sara S. González
1Departamento de Biotecnología, Instituto de Agroquímica y Tecnología de Alimentos (CSIC), P.O. Box 73, 46100 Burjassot, València, Spain
2Unitat de Genètica Evolutiva, Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, Edificio de Institutos, Campus de Paterna, P.O. Box 22085, 46071 València, Spain
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Eladio Barrio
2Unitat de Genètica Evolutiva, Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, Edificio de Institutos, Campus de Paterna, P.O. Box 22085, 46071 València, Spain
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Amparo Querol
1Departamento de Biotecnología, Instituto de Agroquímica y Tecnología de Alimentos (CSIC), P.O. Box 73, 46100 Burjassot, València, Spain
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  • For correspondence: aquerol@iata.csic.es
DOI: 10.1128/AEM.01867-07
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ABSTRACT

We analyzed 24 beer strains from different origins by using PCR-restriction fragment length polymorphism analysis of different gene regions, and six new Saccharomyces cerevisiae × Saccharomyces kudriavzevii hybrid strains were found. This is the first time that the presence in brewing of this new type of hybrid has been demonstrated. From the comparative molecular analysis of these natural hybrids with respect to those described in wines, it can be concluded that these originated from at least two hybridization events and that some brewing hybrids share a common origin with wine hybrids. Finally, a reduction of the S. kudriavzevii fraction of the hybrid genomes was observed, but this reduction was found to vary among hybrids regardless of the source of isolation. The fact that 25% of the strains analyzed were discovered to be S. cerevisiae × S. kudriavzevii hybrids suggests that an important fraction of brewing strains classified as S. cerevisiae may correspond to hybrids, contributing to the complexity of Saccharomyces diversity in brewing environments. The present study raises new questions about the prevalence of these new hybrids in brewing as well as their contribution to the properties of the final product.

  • Copyright © 2008 American Society for Microbiology
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Molecular Characterization of New Natural Hybrids of Saccharomyces cerevisiae and S. kudriavzevii in Brewing
Sara S. González, Eladio Barrio, Amparo Querol
Applied and Environmental Microbiology Apr 2008, 74 (8) 2314-2320; DOI: 10.1128/AEM.01867-07

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Molecular Characterization of New Natural Hybrids of Saccharomyces cerevisiae and S. kudriavzevii in Brewing
Sara S. González, Eladio Barrio, Amparo Querol
Applied and Environmental Microbiology Apr 2008, 74 (8) 2314-2320; DOI: 10.1128/AEM.01867-07
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KEYWORDS

beer
ethanol
Recombination, Genetic
Saccharomyces cerevisiae

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