FIG. 2.

Growth and acetate production by L. plantarum strains affected in POX activity. The wild-type Lp80 (▪), poxB mutant (⧫), poxF mutant (▴), and poxB poxF double-mutant (○) strains of L. plantarum were grown in aerobic conditions at 28°C in MRS-CA supplemented with 0.2% glucose (A, C, E, and G) or 0.2% maltose (B, D, F, and H). Growth was monitored as the OD at 600 nm (A and B). Lactate (solid lines) and acetate (dashed lines) concentrations were measured in the culture supernatants (C and D). Concentrations are given as the difference between the measured concentration and the initial concentration in the culture medium. (E and F) The release of LDH in the supernatant was assayed. The viability (CFU/ml) of the different strains is presented in panels G and H. The data presented are from one of at least three independent experiments that gave essentially the same results.