Serratia marcescens is a gram-negative bacterium that able to produce many secondary metabolites, such as the prominent red pigment prodigiosin (PG). In this work, ptrA -disrupted mutant strain with reduced PG production was selected from Tn 5 transposon mutants. RT–qPCR results indicated promoted elevated transcription of pig gene cluster in S. FZSF02. Furthermore, we found also controls sever...