Fungal diversity during fermentation correlates with thiol concentrations in wine

Knight, Sarah and Klaere, Steffen and Morrison-Whittle, Peter and Goddard, Matthew (2017) Fungal diversity during fermentation correlates with thiol concentrations in wine. Australian Journal of Grape and Wine Research . ISSN 1322-7130

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Abstract

Background and Aims: Agricultural products produced by the same genotypic clone often have different physical and sensorial properties, influencing their overall quality and economic value. Microbes play key roles throughout the production of these goods, affecting plant and fruit health and modifying plant materials to produce socially and economically important commodities. Following this idea, we investigated whether the fungal diversity in the pre-fermented grape juice, and also during fermentation, was correlated with the final concentration of three volatile thiols important to Sauvignon blanc aroma and flavour. Methods: we used metagenomics to quantify yeast populations and GC-MS to quantify thiols and analysed these using random forest statistical approaches. Results: The species of Saccharomyces yeast, the main driver of fermentation, was found to have a significant effect on the concentration of 4MMP in the final wine. Using next-generation sequencing technologies we also identified a number of non-Saccharomyces genera present early in the ferment that correlate with the thiol concentrations. Conclusion: These data suggest non-Saccharomyces fungi may be affecting the accumulation of odourless precursors in the grape itself via pathogenic effects during fruit ripening. Significance: This recapitulates the need for a better understanding of the interactions between microbial populations and agricultural products and has implications for the management of fungal diversity and disease in these systems.

Keywords:Yeast, metagenomics, sauvignon blanc, thiols
Subjects:D Veterinary Sciences, Agriculture and related subjects > D711 Agricultural Microbiology
C Biological Sciences > C150 Environmental Biology
Divisions:College of Science > School of Life Sciences
ID Code:27780
Deposited On:30 Jun 2017 10:12

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