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Abstract A moderately psychrophilic purple non-sulfur bacterium, Rhodoferax antarcticus strain Fryx1, is de-
 

Summary: 236
Abstract A moderately psychrophilic purple non-sulfur
bacterium, Rhodoferax antarcticus strain Fryx1, is de-
scribed. Strain Fryx1 was isolated from the water column
under the ice of the permanently frozen Lake Fryxell,
Antarctica. Cells of Fryx1 are long thin rods and contain
gas vesicles, the first report of such structures in purple
non-sulfur bacteria. Gas vesicles are clustered at 2­4 sites
per cell. Surprisingly, the 16S rRNA gene sequence of
strain Fryx1 is nearly identical to that of Rfx. antarcticus
strain AB, a short, vibrio-shaped phototroph isolated from
an Antarctic microbial mat. Although showing physiolog-
ical parallels, strains AB and Fryx1 differ distinctly in
their morphology and absorption spectra. DNA­DNA hy-
bridization shows that the genomes of strains AB and
Fryx1 are highly related, yet distinct. We conclude that al-
though strains AB and Fryx1 may indeed be the same spe-
cies, their ecologies are quite different. Unlike strain AB,
strain Fryx1 has adapted to a planktonic existence in the
nearly freezing water column of Lake Fryxell.

  

Source: Achenbach, Laurie A. - Department of Microbiology, Southern Illinois University

 

Collections: Environmental Sciences and Ecology; Environmental Management and Restoration Technologies; Biology and Medicine