Figure 7.

Influence of exopolysaccharide I (EPS I) on the formation of microcolonies of 1–5 μm in diameter (a), immature mushroom‐type biofilms (mBFs) of 5–10 μm in diameter (b) and mature mBFs at >10 μm in diameter (c) by Ralstonia solanacearum strains. Cells of R. solanacearum strains OE1–1 and the epsB‐deleted ΔepsB mutant incubated in apoplast fluids from tomato plants on nano‐percolators were observed under a scanning electron microscope. Bars indicate the standard errors. Asterisks indicate a significant difference from ΔphcB/ralA supplemented with methyl 3‐hydroxymyristate (3‐OH MAME) (P < 0.05, t‐test).