Survival and phospholipid Fatty Acid profiles of surface and subsurface bacteria in natural sediment microcosms.

Applied and Environmental Microbiology
T L KieftD C White

Abstract

Although starvation survival has been characterized for many bacteria, few subsurface bacteria have been tested, and few if any have been tested in natural subsurface porous media. We hypothesized that subsurface bacteria may be uniquely adapted for long-term survival in situ. We further hypothesized that subsurface conditions (sediment type and moisture content) would influence microbial survival. We compared starvation survival capabilities of surface and subsurface strains of Pseudomonas fluorescens and a novel Arthrobacter sp. in microcosms composed of natural sediments. Bacteria were incubated for up to 64 weeks under saturated and unsaturated conditions in sterilized microcosms containing either a silty sand paleosol (buried soil) or a sandy silt nonpaleosol sediment. Direct counts, plate counts, and cell sizes were measured. Membrane phospholipid fatty acid (PLFA) profiles were quantified to determine temporal patterns of PLFA stress signatures and differences in PLFAs among strains and treatments. The Arthrobacter strains survived better than the P. fluorescens strains; however, differences in survival between surface and subsurface strains of each genus were not significant. Bacteria survived better in the paleosol tha...Continue Reading

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Citations

Dec 4, 2003·Environmental Microbiology·Melanie R MormileJames K Fredrickson
Jan 15, 2011·Nature Reviews. Microbiology·Jay T Lennon, Stuart E Jones
Jul 19, 2012·World Journal of Microbiology & Biotechnology·Thomas SchwarzenauerPaul Illmer
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