Microbial Dynamics in a Musalais Wine Fermentation: A Metagenomic Study

Area of Science:

• Microbiology
• Fermentation Science
• Food Science

Background:

• Traditional Musalais wine from Xinjiang is a significant cultural heritage.
• Understanding its microbial dynamics is crucial for quality control and optimization.

Purpose of the Study:

• To comprehensively analyze the microbial community structure and functional potential during Musalais wine fermentation.
• To identify key microbial species and metabolic pathways influencing wine quality.
• To discover novel yeast species with potential applications in food fermentation.

Main Methods:

• Metagenomic sequencing was employed to identify microbial species.
• Kyoto Encyclopedia of Genes and Genomes (KEGG) and Gene Ontology (GO) analyses were used to assess functional genes and metabolic pathways.
• Gas chromatography-mass spectrometry (GC-MS) was used to detect volatile compounds.

Main Results:

• A total of 2894 microbial species were identified, with 494 persisting throughout fermentation.
• Saccharomyces cerevisiae was the dominant species, with its prevalence varying across fermentation phases.
• 24 non-Saccharomyces yeast species and several novel yeast species were detected, alongside 82 volatile compounds, primarily higher alcohols and esters.

Conclusions:

• The study elucidated the complex microbial ecosystem of Musalais wine fermentation.
• Identified key microbial players and metabolic pathways provide a basis for process optimization.
• The discovery of novel yeast species opens avenues for future research and application in the fermentation industry.