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Applied and Environmental Microbiology, June 2000, p. 2636-2640, Vol. 66, No. 6
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Effects of Soil and Water Content on Methyl Bromide Oxidation by the Ammonia-Oxidizing Bacterium Nitrosomonas europaeadagger

Khrystyne N. Duddleston,1,Dagger Peter J. Bottomley,1,2,* Angela Porter,1 and Daniel J. Arp3

Department of Microbiology,1 Department of Crop and Soil Science,2 and The Laboratory for N2 Fixation Research, Department of Botany and Plant Pathology,3 Oregon State University, Corvallis, Oregon 97331

Received 12 November 1999/Accepted 28 March 2000

Little information exists on the potential of NH3-oxidizing bacteria to cooxidize halogenated hydrocarbons in soil. A study was conducted to examine the cooxidation of methyl bromide (MeBr) by an NH3-oxidizing bacterium, Nitrosomonas europaea, under soil conditions. Soil and its water content modified the availability of NH4+ and MeBr and influenced the relative rates of substrate (NH3) and cosubstrate (MeBr) oxidations. These observations highlight the complexity associated with characterizing soil cooxidative activities when soil and water interact to differentially affect substrate and cosubstrate availabilities.

* Corresponding author. Mailing address: Department of Microbiology, 220 Nash Hall, Oregon State University, Corvallis, OR 97331. Phone: (541) 737-1844. Fax: (541) 737-0496. E-mail: bottomlp{at}ucs.orst.edu.

dagger Technical paper no. 11,573 of the Oregon Agricultural Experiment Station.

Dagger Present address: Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK 99508.

Applied and Environmental Microbiology, June 2000, p. 2636-2640, Vol. 66, No. 6
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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