Fig. 5
a Effect of exogenous addition of different amino acids (l-histidine, l-alanine, l-proline, l-valine, l-arginine, l-cysteine, l-leucine, l-glutamic acid, l-isoleucine, l-methionine) on the growth of B. subtilis 168 under acetoin stress. b Differential expression results for metabolites and related transcripts. Horizontal coordinates are associated metabolites, vertical coordinates are transcript names, red indicates positive correlation, and blue indicates negative correlation