FIG 6.

GtaB is involved in biofilm formation and cucumber root colonization by B. velezensis SQR9. (A) The complex colony morphology and microtiter plate assay of biofilm formation by the gtaB mutant and wild-type strains at 24 h. (B) OD₆₀₀ of solubilized crystal violet from the microtiter plate assay for the wild-type and gtaB mutant strains at 24 h. (C) The populations of wild-type and gtaB mutant strains colonizing cucumber seeding roots. Error bars indicate the standard deviations from three independent experiments. Different letters above the bars indicate significant differences (P < 0.05).