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Yeast communities associated with  Vitis vinifera  L. ecosystems have been widely characterized. Less is known, however, about yeast communities present in grapes and fermenting musts from  Vitis  non- vinifera  ecosystems. Moreover, there are no comparative studies concerning yeast communities in grapes from  V. vinifera  L. and non- vinifera Vitis  species in vineyards from a shared  terroir . In this work, we have used a culture-dependent strategy, phenotypic analyses, and molecular genotyping, to study the most representative yeast species present in spontaneously fermenting musts of grapes harvested from neighboring  V. vinifera  L. (cv. Malbec) and  V. labrusca  L. (cv. Isabella) vineyards. Phenotypic analyses of H 2 S production, ethanol tolerance and carbon utilization, on randomly selected strains of each  Hanseniaspora uvarum, Starmerella bacillaris  and  Saccharomyces cerevisiae  strains, as well as microsatellite genotyping of  S. cerevisiae  isolates from each the Malbec and Isabella grape musts, suggest that  V. vinifera  L. and  V. labrusca  L. ecosystems could harbor different yeast strain populations. Thus, microbial communities in exotic  Vitis  species may offer opportunities to look for unique yeast strains that could not be present in conventional  V. vinifera  L. ecosystems.

frontiers in microbiology

Differences Between Indigenous Yeast Populations in Spontaneously Fermenting Musts From V. vinifera L. and V. labrusca L. Grapes Harvested in the Same Geographic Location