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 Previous Article

Applied and Environmental Microbiology, July 2006, p. 5138-5141, Vol. 72, No. 7
0099-2240/06/$08.00+0     doi:10.1128/AEM.00489-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Acetate Oxidation Is the Dominant Methanogenic Pathway from Acetate in the Absence of Methanosaetaceae{dagger}

Dimitar Karakashev, Damien J. Batstone, Eric Trably, and Irini Angelidaki*

Institute of Environment & Resources DTU, Technical University of Denmark, Building 113, DK-2800 Kgs. Lyngby, Denmark

Received 1 March 2006/ Accepted 8 May 2006

The oxidation of acetate to hydrogen, and the subsequent conversion of hydrogen and carbon dioxide to methane, has been regarded largely as a niche mechanism occurring at high temperatures or under inhibitory conditions. In this study, 13 anaerobic reactors and sediment from a temperate anaerobic lake were surveyed for their dominant methanogenic population by using fluorescent in situ hybridization and for the degree of acetate oxidation relative to aceticlastic conversion by using radiolabeled [2-14C]acetate in batch incubations. When Methanosaetaceae were not present, acetate oxidation was the dominant methanogenic pathway. Aceticlastic conversion was observed only in the presence of Methanosaetaceae.

* Corresponding author. Mailing address: Institute of Environment & Resources DTU, Technical University of Denmark, Building 113, DK-2800 Kgs. Lyngby, Denmark. Phone: (45) 45251429. Fax: (45) 45932850. E-mail: ria{at}er.dtu.dk.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

Applied and Environmental Microbiology, July 2006, p. 5138-5141, Vol. 72, No. 7
0099-2240/06/$08.00+0     doi:10.1128/AEM.00489-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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