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Appl. Environ. Microbiol., Apr 1997, 1505-1514, Vol 63, No. 4
MG Wise, JV McArthur and LJ Shimkets
Carolina bays are naturally occurring shallow elliptical depressions
largely fed by rain and shallow ground water. To identify members of the
domain Bacteria which inhibit such an environment, we used PCR to construct
a library of 16S rRNA genes (16S rDNAs) cloned from DNA extracted from the
sediments of Rainbow bay, located on the Savannah River Site, near Aiken,
S.C. Oligonucleotides complementary to conserved regions of 16S rDNA were
used as primers for PCR, and gel- purified PCR products were cloned into
vector pGEM-T. Partial sequencing of the cloned 16S rDNAs revealed an
extensive amount of phylogenetic diversity within this system. Of the 35
clones sequenced, 32 were affiliated with five bacterial groups: 11
clustered with the Proteobacteria division (including members of the alpha,
beta, and delta subdivisions), 8 clustered with the Acidobacterium
subdivision of the Fibrobacter division (as categorized by the Ribosomal
Database Project's taxonomic scheme, version 5.0), 7 clustered with the
Verrucomicrobium subdivision of the Planctomyces division, 3 clustered with
the gram-positive bacteria (Clostridium and relatives subdivision), and 3
clustered with the green nonsulfur bacteria. One sequence branched very
deeply from the Bacteria and was found not to be associated with any of the
major divisions when phylogenetic trees were constructed. Two clones did
not consistently cluster with specific groups and may be chimeric
sequences. None of the clones exhibited an exact match to any of the 16S
rDNA sequences deposited in the databases, suggesting that most of the
bacteria in Rainbow Bay are novel species. In particular, the clones
related to the Acidobacterium subdivision and the Verrucomicrobium
subdivision confirm the presence of novel taxa discovered previously in
other molecular surveys of this type.
Copyright © 1997, American Society for Microbiology
Bacterial diversity of a Carolina bay as determined by 16S rRNA gene analysis: confirmation of novel taxa
Department of Microbiology, University of Georgia, Athens 30602-2605, USA.
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