Scent of danger: floc formation by a freshwater bacterium is induced by supernatants from a predator-prey coculture.

Applied and Environmental Microbiology
Judith F BlomJ Pernthaler

Abstract

We investigated predator-prey interactions in a model system consisting of the bacterivorous flagellate Poterioochromonas sp. strain DS and the freshwater bacterium Sphingobium sp. strain Z007. This bacterial strain tends to form a subpopulation of grazing-resistant microscopic flocs, presumably by aggregation. Enhanced formation of such flocs could be demonstrated in static batch culture experiments in the presence of the predator. The ratio of aggregates to single cells reached >0.1 after 120 h of incubation in an oligotrophic growth medium. The inoculation of bacteria into supernatants from cocultures of bacteria and flagellates (grown in oligotrophic or in rich media) also resulted in a substantially higher level of floc formation than that in supernatants from bacterial monocultures only. After separation of supernatants on a C(18) cartridge, the aggregate-inducing activity could be assigned to the 50% aqueous methanolic fraction, and further separation of this bioactive fraction could be achieved by high-pressure liquid chromatography. These results strongly suggest the involvement of one or several chemical factors in the induction of floc formation by Sphingobium sp. strain Z007 that are possibly released into the surro...Continue Reading

References

Feb 7, 2001·Applied and Environmental Microbiology·B SchweitzerM Simon
Nov 27, 2002·Antonie van Leeuwenhoek·Klaus Jürgens, Carsten Matz
Jul 4, 2003·Applied and Environmental Microbiology·Alexander EilerLars J Tranvik
Nov 6, 2004·Applied and Environmental Microbiology·Kathleen A PageStephen J Giovannoni
Jun 15, 2005·Nature Reviews. Microbiology·Jakob Pernthaler
Feb 1, 1997·Applied and Environmental Microbiology·J PernthalerR Psenner
Oct 6, 2006·Applied and Environmental Microbiology·Claudia PicciniJakob Pernthaler
Feb 6, 2007·Trends in Ecology & Evolution·Georg PohnertRalph Tollrian
Apr 21, 2009·Applied and Environmental Microbiology·K R Min, A H Rickard
Apr 22, 2010·Environmental Microbiology·Judith F BlomJakob Pernthaler

❮ Previous
Next ❯

Citations

Jan 5, 2014·Nature Reviews. Microbiology·Dennis ClaessenGilles P van Wezel
Apr 11, 2015·Environmental Microbiology Reports·Joe D Taylor, Michael Cunliffe
Jul 30, 2014·Frontiers in Microbiology·Gianluca CornoStefania Stefani
Apr 4, 2017·Environmental Microbiology·Jakob Pernthaler
Sep 30, 2017·FEMS Microbiology Ecology·Claudia SeilerMarkus Weitere
Mar 1, 2018·AIMS Microbiology·Thomas TrunkJack C Leo
Aug 31, 2020·MicrobiologyOpen·Hawzeen S KhalilJack C Leo

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.