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Applied and Environmental Microbiology, July 2000, p. 2873-2881, Vol. 66, No. 7
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Analysis of Ammonia-Oxidizing Bacteria from Hypersaline Mono Lake, California, on the Basis of 16S rRNA Sequences

B. B. Ward,1,dagger ,* D. P. Martino,2,dagger M. C. Diaz,3 and S. B. Joye2,Dagger

Institute of Marine Sciences1 and Biology Department,3 University of California, Santa Cruz, California, and Department of Oceanography, Texas A & M University, College Station, Texas 778432

Received 11 October 1999/Accepted 2 May 2000

Ammonia-oxidizing bacteria were detected by PCR amplification of DNA extracted from filtered water samples throughout the water column of Mono Lake, California. Ammonia-oxidizing members of the beta  subdivision of the division Proteobacteria (beta -subdivision Proteobacteria) were detected using previously characterized PCR primers; target sequences were detected by direct amplification in both surface water and below the chemocline. Denaturing gradient gel electrophoresis analysis indicated the presence of at least four different beta -subdivision ammonia oxidizers in some samples. Subsequent sequencing of amplified 16S rDNA fragments verified the presence of sequences very similar to those of cultured Nitrosomonas strains. Two separate analyses, carried out under different conditions (different reagents, locations, PCR machines, sequencers, etc.), 2 years apart, detected similar ranges of sequence diversity in these samples. It seems likely that the physiological diversity of nitrifiers exceeds the diversity of their ribosomal sequences and that these sequences represent members of the Nitrosomonas europaea group that are acclimated to alkaline, high-salinity environments. Primers specific for Nitrosococcus oceanus, a marine ammonia-oxidizing bacterium in the gamma  subdivision of the Proteobacteria, did not amplify target from any samples.


* Corresponding author. Mailing address: Geosciences Department, Princeton University, Princeton, NJ 08544. Phone: (609) 258-5150. Fax: (609) 258-1274. E-mail: bbw{at}princeton.edu.

dagger Present address: Geosciences Department, Princeton University, Princeton, NJ 08544.

Dagger Present address: Department of Marine Sciences, University of Georgia, Athens, GA 30602.


Applied and Environmental Microbiology, July 2000, p. 2873-2881, Vol. 66, No. 7
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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