FIG 2 .
Accumulation of spontaneous Gac− mutants in NYB cultures of P. protegens Pf-5 over time. Wild-type P. protegens Pf-5 was cultured in NYB for 6 dpi. (A and B) The percentage of spontaneous Gac− mutants in the bacterial population (A) and the bacterial cell density (B) were recorded daily. In panel B, the cell density of Gac− mutants at 1 dpi is shown as an open triangle, which represents the detection limit, as no Gac− mutant was detected by screening more than 400 colonies. Each experiment had at least three replicates. Means ± standard errors (error bars) are shown.