FIG 1.

Comparison of the phenotypic differences between P. chlororaphis YL-1 and mutants cultured in liquid SM and LB medium. (a) Color of culture broth in visible light; (b) fluorescence under UV light; (c) cell number; (d) PVD production. P. chlororaphis YL-1 and mutants were cultured in liquid SM and LB medium, respectively, at 28°C and 200 rpm for 24 h. All liquid cultures were observed under visible light and UV light. The number of bacterial cells was determined by counting the numbers of CFU per ml. PVD production was measured as the OD₄₀₅ of culture supernatants appropriately diluted in 0.1 M Tris-HCl (pH 8) and normalized to the OD₆₀₀ of the corresponding cultures.