Dry biomass (milligrams) of P. roqueforti DPPMAF1 incubated in WFH for 48 h at 25°C under different conditions. Treatments were as follows: 1, WFH alone (control); 2, WFH with 0.3% (wt/vol) calcium propionate added; 3, WFH with 30% (vol/vol, 1.71 mg of peptide/ml) water-soluble extract of sourdough L. brevis AM7 added; 4, WFH with 27% (vol/vol, 5 mg of protein/ml) water-soluble extract of P. vulgaris cv. Pinto added; 5, WFH with a mixture of 30% (vol/vol, 1.71 mg of peptide/ml) water-soluble extract of sourdough L. brevis AM7 and 27% (vol/vol, 5 mg of protein/ml) water-soluble extract of P. vulgaris cv. Pinto added. Data are the mean of three independent experiments, and the values marked with different letters are statistically significantly different (P ≤ 0.001).