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

Environmental Science & Technology
Celia Jimenez-SanchezJosé-Julio Ortega-Calvo

Abstract

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...Continue Reading

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Citations

Mar 12, 2016·Environmental Pollution·José-Julio Ortega-CalvoIan P Thompson
Jul 22, 2015·Environmental Pollution·Eleonora CongiuJosé-Julio Ortega-Calvo
Jun 12, 2016·Environmental Science & Technology·Rungroch SungthongJose Julio Ortega-Calvo
Aug 4, 2016·Fungal Genetics and Biology : FG & B·Kristin Schulz-BohmPaolina Garbeva
May 14, 2020·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Nurhidayah HamzahSimon Swift
Dec 21, 2019·Environmental Microbiology Reports·Tao TianYunrong Chai
Nov 28, 2020·The Science of the Total Environment·Carmen Fernández-LópezJose Julio Ortega-Calvo
Jan 2, 2021·The Science of the Total Environment·Kaikai ZhangYanrong Zhang
Apr 19, 2021·Journal of Hazardous Materials·Son A HoangNanthi S Bolan
Aug 17, 2018·Environmental Science & Technology·Celia Jimenez-SanchezJose-Julio Ortega-Calvo

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