The method with our previous research (Pan et al., 2019), with slight modifications. Briefly, JNB5-1 and SMCR were grown at 30°C and 37°C in a rotary shaker with fermentation medium (Sucrose 2%, Beef extract 1.5%, CaCl2 1%, L-proline 0.75%, MgSO4·7H2O 0.02%, and FeSO4·7H2O 0.006%) at 180 rpm for 120 h. The production of PG were determined at different fermentation time intervals (0, 12, 24, 36, 48, 60, 72, 84, 96, and 120 h) in triplicate.
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