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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,
,*
D. P.
Martino,2,
M. C.
Diaz,3 and
S. B.
Joye2,
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
subdivision of the division Proteobacteria (
-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
-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
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.

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

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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