Fig. 4

Metabolic pathway analysis of significantly differential metabolites and cluster analysis of significantly differential metabolite contents after acetoin stress treatment. a Metabolic pathway analysis of significantly differential metabolites in the 60 g/L acetoin treatment group (B. subtilis 168-pMA5) and 0 g/L acetoin control group (B. subtilis 168-pMA5). b Metabolic pathway analysis of significantly differential metabolites in acetoin stress between B. subtilis 168-pMA5 and B. subtilis 168-phaCBA. c Heatmap obtained by hierarchical clustering analysis of differential metabolites between B. subtilis 168-pMA5 (0 g/L, 60 g/L acetoin stress) and B. subtilis 168-phaCBA (60 g/L acetoin stress)