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Appl Environ Microbiol, July 1998, p. 2545-2553, Vol. 64, No. 7
0099-2240/98/$00.00+0
A Highly Selective PCR Protocol for Detecting 16S rRNA Genes
of the Genus Pseudomonas (Sensu Stricto) in
Environmental Samples
Franco
Widmer,1,2,
Ramon J.
Seidler,2,*
Patrick M.
Gillevet,3
Lidia S.
Watrud,2 and
George D.
Di Giovanni1,2,
National Research
Council1 and
National Health and
Ecological Effects Research Laboratory,2
U.S. Environmental Protection Agency, Western Ecology Division,
Corvallis, Oregon 97333, and
Institute for Bioscience,
Bioinformatics, and Biotechnology, George Mason University,
Manassas, Virginia 201103
Received 5 June 1997/Accepted 9 April 1998
Pseudomonas species are plant, animal, and human
pathogens; exhibit plant pathogen-suppressing properties useful in
biological control; or express metabolic versatilities valued in
biotechnology and bioremediation. Specific detection of
Pseudomonas species in the environment may help us gain a
more complete understanding of the ecological significance of these
microorganisms. The objective of this study was to develop a PCR
protocol for selective detection of
Pseudomonas (sensu stricto) in environmental samples.
Extensive database searches identified a highly
selective PCR primer pair for amplification of Pseudomonas
16S rRNA genes. A protocol that included PCR amplification and
restriction analysis, a general cloning and sequencing strategy, and
phylogenetic analyses was developed. The PCR protocol was validated by
testing 50 target and 14 nontarget pure cultures, which confirmed the
selectivity to 100%. Further validation used amplification of target
sequences from purified bulk soil DNA followed by cloning of PCR
products. Restriction analysis with HaeIII revealed eight
different fragmentation patterns among 36 clones. Sequencing and
phylogenetic analysis of 8 representative clones indicated that 91.7%
of the products were derived from target organisms of the PCR protocol.
Three patterns, representing only 8.3% of the 36 clones, were derived from non-Pseudomonas or chimeric PCR artifacts. Three
patterns, representing 61.1% of the clones, clustered with sequences
of confirmed Pseudomonas species, whereas two patterns,
representing 30.6% of the clones, formed a novel phylogenetic cluster
closely associated with Pseudomonas species. The
results indicated that the Pseudomonas-selective PCR
primers were highly specific and may represent a powerful tool for
Pseudomonas population structure analyses and taxonomic
confirmations.
*
Corresponding author. Mailing address: U.S.
Environmental Protection Agency, WED, NHEERL, 200 SW 35th St.,
Corvallis, OR 97333-4902. Phone: (541) 754-4708. Fax: (541)
754-4799. E-mail: seidler{at}mail.cor.epa.gov.

Present address: Institute for Terrestrial Ecology, ETH
Zürich, CH-8952 Schlieren, Switzerland.

Present address: American Waterworks Services Company, Inc.,
Quality Control and Research Laboratory, Belleville, IL 62220.
Appl Environ Microbiol, July 1998, p. 2545-2553, Vol. 64, No. 7
0099-2240/98/$00.00+0
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