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Guided movement in response to slowly diffusing polymeric trails provides aunique mechanism for self-organization of some microorganisms. To elucidate howthis signaling route leads to microcolony formation, we experimentally probethe trajectory and orientation of Pseudomonas aeruginosa that propel themselveson a surface using type IV pili motility appendages, which preferentiallyattach to deposited exopolysaccharides. We construct a stochastic model byanalyzing single-bacterium trajectories, and show that the resultingtheoretical prediction for the many-body behavior of the bacteria is inquantitative agreement with our experimental characterization of how cellsexplore the surface via a power law strategy.

Multicellular self-organization of P. aeruginosa due to interactions with secreted trails