(A) Bacterial biofilm formation on an A. thaliana root in the gnoto biotic system after 2 h of incubation.
(B) Bacterial biofilm formation in the gnotobiotic system after 5 h of incubation.
(C) Deconvoluted optical section of 20-μm slices of surface-sterilized A. thaliana roots, 5 h after inoculation.
(D) Bacterial biofilm formation on an A. thaliana tap root after 1 week of colonization in the soil assay.
(E) Bacterial biofilm formation on a barley (H. vulgare) root colonized by P. polymyxa B1::pCM20 in a soil assay after 1 week of incubation.
(F) Control roots treated with a mock solution.