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Title

Impact of dissolved organic matter on bacterial tactic motility, attachment, and transport

AuthorsJiménez Sánchez, Celia ; Wick, Lukas Y.; Cantos, Manuel ; Ortega Calvo, J. J.
Issue DateMar-2015
PublisherAmerican Chemical Society
CitationEnvironmental Science and Technology 49: 4498-4505 (2015)
Abstract© 2015 American Chemical Society. Bacterial dispersal is a key driver of the ecology of microbial contaminant degradation in soils. This work investigated the role of dissolved organic matter (DOM) in the motility, attachment, and transport of the soil bacterium Pseudomonas putida G7 in saturated porous media. The study is based on the hypothesis that DOM quality is critical to triggering tactic motility and, consequently, affects bacterial transport and dispersal. Sunflower root exudates, humic acids (HA), and the synthetic oleophilic fertilizer S-200 were used as representatives of fresh, weathered, and artificially processed DOM with high nitrogen and phosphorus contents, respectively. We studied DOM levels of 16-130 mg L-1, which are representative of DOM concentrations typically found in agricultural soil pore water. In contrast to its responses to HA and S-200, strain G7 exhibited a tactic behavior toward root exudates, as quantified by chemotaxis assays and single-cell motility observations. All DOM types promoted bacterial transport through sand at high concentrations (∼130 mg L-1). At low DOM concentrations (∼16 mg L-1), the enhancement occurred only in the presence of sunflower root exudates, and this enhancement did not occur with G7 bacteria devoid of flagella. Our results suggest that tactic DOM effectors strongly influence bacterial transport and the interception probability of motile bacteria by collector surfaces.
Description8 páginas.-- 4 figuras.-- 1 tabla.-- 47 referencias.-- Supporting Information: Figures showing quantitative and qualitative tactic response to DOM and amino acids, transport of sonicated cells with high-DOM exudates, and the effect of sorbed humic acids on bacterial transport; Table showing chemical composition of DOM solutions; and Videos showing bacterial cell motility with and without exudates. This material is available free of charge via the Internet at http://pubs.acs.org/doi/suppl/10.1021/es5056484
Publisher version (URL)http://dx.doi.org/10.1021/es5056484
URIhttp://hdl.handle.net/10261/115520
DOI10.1021/es5056484
Identifiersdoi: 10.1021/es5056484
issn: 1520-5851
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