Abstract
The use of sulfur dioxide (SO2) as an antimicrobial in winemaking is a well-established, common practice. Although much is known about the antimicrobial effects of SO2 at single concentrations, little is known about its effects on microbial growth dynamics across a range of concentrations or when used in conjunction with yeast inoculation. Using high-throughput marker-gene sequencing, we investigated the cumulative impacts of yeast inoculation and SO2 treatments across a broad concentration range (0 to 150 mg/L SO2) on the bacterial and fungal communities in wine fermentations. Our results indicated a dose-dependent effect of SO2, with lactic acid bacteria and Gluconobacter proliferating in fermentations with
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