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Monitoring the mycobiota during Greco di Tufo and Aglianico wine fermentation by 18S rRNA gene sequencing.
Food Microbiology 2017 May
Spontaneous alcoholic fermentation of grape must is a complex process, carried out by indigenous yeast populations arising from the vineyard or the winery environment and therefore representing an autochthonous microbial terroir of the production area. Microbial diversity at species and biotype level is extremely important in order to develop the composite and typical flavour profile of DOCG (Appellation of Controlled and Guaranteed Origin) wines. In this study, we monitored fungal populations involved in spontaneous fermentations of Aglianico and Greco di Tufo grape must by high-throughput sequencing (HTS) of 18S rRNA gene amplicons. We firstly proposed an alternative/addition to ITS as target gene in HTS studies and highlighted consistency between the culture-dependent and -independent approaches. A complex mycobiota was found at the beginning of the fermentation, mainly characterized by non-Saccharomyces yeasts and several moulds, with differences between the two types of grapes. Moreover, Interdelta patterns revealed a succession of several Saccharomyces cerevisiae biotypes and a high genetic diversity within this species.
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