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Appl Environ Microbiol, March 1998, p. 1143-1146, Vol. 64, No. 3
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Methanol Improves Methane Uptake in Starved Methanotrophic Microorganisms

Sigmund Jensen,1 Anders Priemé,2,* and Lars Bakken3

Department of Biotechnological Sciences1 and Department of Soil and Water Sciences,3 Agricultural University of Norway, N-1432 Ås, Norway, and Department of Population Biology, University of Copenhagen, 2100 Copenhagen Ø, Denmark2

Received 27 June 1997/Accepted 22 December 1997

Methanotrophs in enrichment cultures grew and sustained atmospheric methane oxidation when supplied with methanol. If they were not supplied with methanol or formate, their atmospheric methane oxidation came to a halt, but it was restored within hours in response to methanol or formate. Indigenous forest soil methanotrophs were also dependent on a supply of methanol upon reduced methane access but only when exposed to a methane-free atmosphere. Their immediate response to each methanol addition, however, was to shut down the oxidation of atmospheric methane and to reactivate atmospheric methane oxidation as the methanol was depleted.

* Corresponding author. Mailing address: Department of Population Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen Ø, Denmark. Phone: 4535321273. Fax: 4535321250. E-mail: aprieme{at}zi.ku.dk.




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