caa a22 4500 605516855 CHVBK 20210128100716.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10533-014-0040-9 doi (NATIONALLICENCE)springer-10.1007/s10533-014-0040-9 Bacterial impact on the wetting properties of soil minerals [Elektronische Daten] [Jan Achtenhagen, Marc-O. Goebel, Anja Miltner, Susanne Woche, Matthias Kästner] Soil-water repellency (SWR) is a widely observed phenomenon with severe impacts, but a physicochemical framework to explain the process of SWR development is still a major field of research. Recent studies have shown that microbial biomass residues, in particular cell fragments, contribute significantly to the formation of soil organic matter (SOM) and can decrease wettability. It was also shown that osmotic stress increases the hydrophobicity of bacterial cell surfaces. If microorganisms are an important source of SOM, the attachment of cells and their residues on mineral grains should decrease wettability of minerals, and the effect should be more pronounced in case of osmotic stress. Cultures of Pseudomonas putida, either unstressed or exposed to osmotic stress, and cell fragments were mixed with minerals and the impact on surface wetting properties was investigated by determining the solid-water contact angle (CA). Attachment of bacteria to quartz surfaces resulted in a significant increase in hydrophobicity of the surfaces (CA increase by up to 90°), in particular for stressed cells. Cell fragments and cytosol were alsofound to decrease wettability significantly (CAs of up to 100°). These findings may explain various phenomena related to SWR, like critical soil-water content, and may be one important explanation for the formation of SWR after irrigation with treated sewage effluents. The results also support the hypothesis of a microbial origin of SWR, in which macromolecular biological structures may have a greater impact than specific classes of organic compounds. Springer International Publishing Switzerland, 2014 Bacterial cell wall fragments, lipids and proteins nationallicence Contact angle nationallicence Environmental scanning microscopy nationallicence Microbial biomass nationallicence Osmotic stress nationallicence Soilwater repellency nationallicence Achtenhagen Jan Department of Environmental Biotechnology, UFZ - Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany aut Goebel Marc-O Institute of Soil Science, Leibniz University Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany aut Miltner Anja Department of Environmental Biotechnology, UFZ - Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany aut Woche Susanne Institute of Soil Science, Leibniz University Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany aut Kästner Matthias Department of Environmental Biotechnology, UFZ - Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany aut Biogeochemistry Springer International Publishing 122/2-3(2015-02-01), 269-280 0168-2563 122:2-3<269 2015 122 10533 https://doi.org/10.1007/s10533-014-0040-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-014-0040-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Achtenhagen Jan Department of Environmental Biotechnology, UFZ - Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany aut NATIONALLICENCE 700 1- Goebel Marc-O Institute of Soil Science, Leibniz University Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany aut NATIONALLICENCE 700 1- Miltner Anja Department of Environmental Biotechnology, UFZ - Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany aut NATIONALLICENCE 700 1- Woche Susanne Institute of Soil Science, Leibniz University Hannover, Herrenhäuser Str. 2, 30419, Hannover, Germany aut NATIONALLICENCE 700 1- Kästner Matthias Department of Environmental Biotechnology, UFZ - Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 122/2-3(2015-02-01), 269-280 0168-2563 122:2-3<269 2015 122 10533