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• W2912796760 abstract "ABSTRACT Cellulose over-producing wrinkly spreader mutants of Pseudomonas fluorescens SBW25 have been the focus of much investigation, but conditions promoting the production of cellulose in ancestral SBW25, its effects and consequences have escaped investigation through lack of in vitro phenotype. Here, using a custom built device, we reveal that in static broth microcosms ancestral SBW25 encounters environmental signals at the air-liquid interface that activate, via three diguanylate cyclase-encoding pathways (Wsp, Aws and Mws), production of cellulose. Secretion of the polymer at the meniscus leads to modification of the environment and growth of numerous micro-colonies that extend out from the surface. Accumulation of cellulose and associated microbial growth leads to Rayleigh-Taylor instability resulting in bioconvection and rapid transport of water-soluble products over tens of millimetres. Drawing upon data we build a mathematical model that recapitulates experimental results and captures the interactions between biological, chemical and physical processes. IMPORTANCE This work reveals a new bacterial behaviour that manifests at the air-liquid interface, which depends on production of cellulose, and hints to hitherto unrecognised dimensions to bacterial life at surfaces. Additionally, the study links activation of known diguanylate cyclase-encoding pathways to cellulose expression and to signals encountered at the air-liquid interface. Further significance stems from recognition of the consequences of fluid instabilities arising from surface production of cellulose for transport of water-soluble products over large distances." @default.
• W2912796760 created "2019-02-21" @default.
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• W2912796760 date "2019-02-01" @default.
• W2912796760 modified "2023-09-23" @default.
• W2912796760 title "Causes and consequences of cellulose production by<i>Pseudomonas fluorescens</i>SBW25 at the air-liquid interface" @default.
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• W2912796760 doi "https://doi.org/10.1101/538561" @default.
• W2912796760 hasPublicationYear "2019" @default.
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