Singlet oxygen, a neglected but important environmental factor: short-term and long-term effects on bacterioplankton composition in a humic lake

Environmental Microbiology
Stefanie P GlaeserJens Glaeser

Abstract

Photolysis of dissolved organic matter (DOM) leads to contrasting effects on bacterioplankton dynamics, i.e. stimulation and inhibition of bacterial activity. In particular, the role of short-lived reactive oxygen species (ROS), e.g. singlet oxygen (¹O₂), in altering microbial activity and species composition has scarcely been investigated. Therefore, we have artificially increased the natural rate of ¹O₂ formation in short-term (∼4 h) in situ and long-term (72 h) laboratory incubations of surface water samples from a humic acid-rich lake. Denaturing gradient gel electrophoresis (DGGE) patterns revealed significant changes in occurrence of abundant bacterioplankton phylotypes upon ¹O₂ exposure. Cluster analysis of DGGE patterns showed that a moderate increase in ¹O₂ exposure leads to similar changes in different years indicating the establishment of bacterial communities adapted to ¹O₂ exposure. Bacterioplankton phylotypes favoured under these conditions belonged to Betaproteobacteria of the beta II cluster (e.g. Polynucleobacter necessarius) and the beta I cluster related to Limnohabitans (R-BT subcluster) as well as Alphaproteobacteria affiliated to Novosphingobium acidiphilum. In contrast, Actinobacteria of the freshwater ac...Continue Reading

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Citations

Feb 18, 2015·Environmental Science and Pollution Research International·Morgan PetitJean-François Rontani
Mar 12, 2015·The Plant Journal : for Cell and Molecular Biology·Erika EricksonKrishna K Niyogi
Feb 13, 2013·Proceedings of the National Academy of Sciences of the United States of America·Rose M CoryGeorge W Kling
Nov 27, 2010·Environmental Microbiology·Bork Ansgar BerghoffGabriele Klug

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