, a commensal member of the gut microbiota, is associated with elevated gas production during fermentation.

has been correlated with gas production by human faecal microbiota during fermentation. The objective of this study was to determine the role of in gas production by the microbiome. Kidney beans and sweet potatoes were subjected to digestion and dialysis followed by fermentation with ten faecal microbiomes: three with detectable (Me_D) and seven with no detectable (Me_ND). Me_D microbiomes produced more gas than the Me_ND microbiomes ( < 0.001). Me_D microbiomes produced more gas during fermentation of sweet potatoes than kidney beans ( < 0.001), while the opposite was true for the Me_ND microbiomes ( < 0.001). Among amplicon sequence variants that were associated with gas production, had the strongest association ( < 0.001). Me_D microbiomes consumed more acetate and produced more butyrate than Me_ND microbiomes ( < 0.001). Gas production by was confirmed by fermentation of sweet potatoes and acetate with human and rumen isolates. The human isolate produced gas on sweet potatoes and acetate. This study suggests that may be involved in gas production during the fermentation of flatulogenic foods through utilisation of undigestible substrates or cross-feeding on acetate.