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Appl. Environ. Microbiol., May 1995, 1917-1922, Vol 61, No. 5
JK Fredrickson, DL Balkwill, GR Drake, MF Romine, DB Ringelberg and DC White
An obligately aerobic chemoheterotrophic bacterium (strain F199) previously
isolated from Southeast Coastal Plain subsurface sediments and shown to
degrade toluene, naphthalene, and other aromatic compounds (J. K.
Fredrickson, F. J. Brockman, D. J. Workman, S. W. Li, and T. O. Stevens,
Appl. Environ. Microbiol. 57:796-803, 1991) was characterized by analysis
of its 16S rRNA nucleotide base sequence and cellular lipid composition.
Strain F199 contained 2-OH14:0 and 18:1 omega 7c as the predominant
cellular fatty acids and sphingolipids that are characteristic of the genus
Sphingomonas. Phylogenetic analysis of its 16S rRNA sequence indicated that
F199 was most closely related to Sphingomonas capsulata among the bacteria
currently in the Ribosomal Database. Five additional isolates from deep
Southeast Coastal Plain sediments were determined by 16S rRNA sequence
analysis to be closely related to F199. These strains also contained
characteristic sphingolipids. Four of these five strains could also grow on
a broad range of aromatic compounds and could mineralize [14C]toluene and
[14C]naphthalene. S. capsulata (ATCC 14666), Sphingomonas paucimobilis
(ATCC 29837), and one of the subsurface isolates were unable to grow on any
of the aromatic compounds or mineralize toluene or naphthalene. These
results indicate that bacteria within the genus Sphingomonas are present in
Southeast Coastal Plain subsurface sediments and that the capacity for
degrading a broad range of substituted aromatic compounds appears to be
common among Sphingomonas species from this environment.
Copyright © 1995, American Society for Microbiology
Aromatic-degrading Sphingomonas isolates from the deep subsurface
Pacific Northwest Laboratory, Richland, Washington 99352, USA.
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