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Luria Broth (LB) and Luria Agar (LA) Media and Their Uses: Serratia marcescens​

FIG. 1. LA plate streaked with Serratia marcescens and incubated at room temperature for 24 hours; top view. S. marcescens produces a red pigment called prodigiosin. The level of prodigiosin synthesis is somewhat variable as shown by the mix of white and red colonies. Incubation at 37 C completely inhibits pigment production and S. marcescens will be white. (Kevin Hedetniemi and Min-Ken Liao, Furman University, Greenville, SC)

FIG. 2. LA plate streaked with Serratia marcescens and incubated at room temperature for 24 hours: side view. (Kevin Hedetniemi and Min-Ken Liao, Furman University, Greenville, SC)​