Abstract
The aim of this work was to study the biodiversity of yeasts isolated from the autochthonous grape variety called “Uva di Troia”, monitoring the natural diversity from the grape berries to wine during a vintage. Grapes were collected in vineyards from two different geographical areas and spontaneous alcoholic fermentations (AFs) were performed. Different restriction profiles of ITS–5.8S rDNA region, corresponding to Saccharomyces cerevisiae, Issatchenkia orientalis, Metschnikowia pulcherrima, Hanseniaspora uvarum, Candida zemplinina, Issatchenkia terricola, Kluyveromyces thermotolerans, Torulaspora delbrueckii, Metschnikowia chrysoperlae, Pichia fermentans, Hanseniaspora opuntiae and Hanseniaspora guilliermondii, were observed. The yeast occurrences varied significantly from both grape berries and grape juices, depending on the sampling location. Furthermore, samples collected at the end of AF revealed the great predominance of Saccharomyces cerevisiae, with a high intraspecific biodiversity. This is the first report on the population dynamics of ‘cultivable’ microbiota diversity of “Uva di Troia” cultivar from the grape to the corresponding wine (“Nero di Troia”), and more general for Southern Italian oenological productions, allowing us to provide the basis for an improved management of wine yeasts (with both non-Saccharomyces and Saccharomyces) for the production of typical wines with desired unique traits. A certain geographical-dependent variability has been reported, suggesting the need of local based formulation for autochthonous starter cultures, especially in the proportion of the different species/strains in the design of mixed microbial preparations.
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Acknowledgments
This research was supported by the Apulian Region in the framework of Project 6N7AD82 “Autochthonous2Autochthonous: risorse microbiologiche per vini in purezza da vitigni autoctoni (e per produzioni biologiche” and “Biotecnologie degli alimenti per l’innovazione e la competitività delle principali filiere regionali: estensione della conservabilità e aspetti funzionali (BiotecA)”. Vittorio Capozzi is supported by a grant by the Apulian Region in the framework of ‘FutureInResearch’ program (practice code 9OJ4W81).
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Figure S1
Frequency (%) of different yeasts species isolated from grape berries of “Uva di Troia”, during vintages 2012. Open bars, Ascoli Satriano vineyards; black bars, Lucera vineyards; light grey bars, total yeast identified. Different letters in superscript bars indicate statistical significance (One-way ANOVA, Turkey test P < 0.005) (JPEG 34 kb)
Figure S2
Frequency (%) of different yeasts species isolated from spontaneous fermentation of grape juice of “Uva di Troia”, during vintages 2012. Open bars, Ascoli Satriano vineyards; black bars, Lucera vineyards; light grey bars, total yeast identified. Different letters in superscript bars indicate statistical significance (One-way ANOVA, Turkey test P < 0.005) (JPEG 54 kb)
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Garofalo, C., Tristezza, M., Grieco, F. et al. From grape berries to wine: population dynamics of cultivable yeasts associated to “Nero di Troia” autochthonous grape cultivar. World J Microbiol Biotechnol 32, 59 (2016). https://doi.org/10.1007/s11274-016-2017-4
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DOI: https://doi.org/10.1007/s11274-016-2017-4