FIG 2.

Transcriptional activity of the phlD gene in wild-type P. brassicacearum LBUM300 and strain LBUM300ΔhcnC in the rhizosphere of tomato plants detected at 24 h, 72 h, 120 h, 168 h, 216 h, and 264 h postinoculation using RT-qPCR (n = 8 for each treatment). phlD gene transcripts were normalized to phlD gene copy number per gram of rhizosphere soil. Strain LBUM300ΔphlD, carrying a disrupted phlD gene and incapable of phlD expression and DAPG production, is represented by an asterisk. The mean of all times within each treatment is indicated by a white bar, and treatments showing different letters are significantly different (P < 0.05). Error bars are standard errors of the means.