FIG 4.

Growth rates of L. reuteri wild-type strain FUA3400 and L. reuteri mutant strain FUA3400ΔgupCDE in mMRS broth. White bars indicate glucose as a carbon source, matching the major carbon source in sorghum doughs (S1 and S2 media); gray bars indicate maltose as a carbon source, matching the major carbon source in wheat doughs (W1 and W2 media); and hatched bars indicate the addition of electron acceptors (10 mmol/liter glycerol in S2 medium and 10 mmol/liter sucrose in W2 medium). Symbols indicate significant differences (P < 0.05) between S1 and S2 media (*), between W1 and W2 media (**), and between the wild-type strain FUA3400 and the mutant strain FUA3400ΔgupCDE (Δ). Data shown are means ± standard deviations from triplicate independent experiments.