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Applied and Environmental Microbiology, May 2000, p. 1801-1808, Vol. 66, No. 5
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Molecular Analyses of Novel Methanotrophic Communities in Forest Soil That Oxidize Atmospheric Methane

Thilo Henckel, Udo Jäckel, Sylvia Schnell, and Ralf Conrad*

Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Strasse, 35043 Marburg, Germany

Received 1 October 1999/Accepted 7 January 2000

Forest and other upland soils are important sinks for atmospheric CH4, consuming 20 to 60 Tg of CH4 per year. Consumption of atmospheric CH4 by soil is a microbiological process. However, little is known about the methanotrophic bacterial community in forest soils. We measured vertical profiles of atmospheric CH4 oxidation rates in a German forest soil and characterized the methanotrophic populations by PCR and denaturing gradient gel electrophoresis (DGGE) with primer sets targeting the pmoA gene, coding for the alpha  subunit of the particulate methane monooxygenase, and the small-subunit rRNA gene (SSU rDNA) of all life. The forest soil was a sink for atmospheric CH4 in situ and in vitro at all times. In winter, atmospheric CH4 was oxidized in a well-defined subsurface soil layer (6 to 14 cm deep), whereas in summer, the complete soil core was active (0 cm to 26 cm deep). The content of total extractable DNA was about 10-fold higher in summer than in winter. It decreased with soil depth (0 to 28 cm deep) from about 40 to 1 µg DNA per g (dry weight) of soil. The PCR product concentration of SSU rDNA of all life was constant both in winter and in summer. However, the PCR product concentration of pmoA changed with depth and season. pmoA was detected only in soil layers with active CH4 oxidation, i.e., 6 to 16 cm deep in winter and throughout the soil core in summer. The same methanotrophic populations were present in winter and summer. Layers with high CH4 consumption rates also exhibited more bands of pmoA in DGGE, indicating that high CH4 oxidation activity was positively correlated with the number of methanotrophic populations present. The pmoA sequences derived from excised DGGE bands were only distantly related to those of known methanotrophs, indicating the existence of unknown methanotrophs involved in atmospheric CH4 consumption.

* Corresponding author. Mailing address: Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Strasse, 35043 Marburg, Germany. Phone: 49-6421-178801. Fax: 49-6421-178809. E-mail: conrad{at}mailer.uni-marburg.de.

Applied and Environmental Microbiology, May 2000, p. 1801-1808, Vol. 66, No. 5
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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