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Appl. Environ. Microbiol., Mar 1997, 1124-1130, Vol 63, No. 3
SC Cary, MT Cottrell, JL Stein, F Camacho and D Desbruyeres
Alvinella pompejana is a polychaetous annelid that inhabits
high-temperature environments associated with active deep-sea hydrothermal
vents along the East Pacific Rise. A unique and diverse epibiotic
microflora with a prominent filamentous morphotype is found associated with
the worm's dorsal integument. A previous study established the taxonomic
positions of two epsilon proteobacterial phylotypes, 13B and 5A, which
dominated a clone library of 16S rRNA genes amplified by PCR from the
epibiotic microbial community of an A. pompejana specimen. In the present
study deoxyoligonucleotide PCR primers specific for phylotypes 13B and 5A
were used to demonstrate that these phylotypes are regular features of the
bacterial community associated with A. pompejana. Assaying of other
surfaces around colonies of A. pompejana revealed that phylotypes 13B and
5A are not restricted to A. pompejana. Phylotype 13B occurs on the exterior
surfaces of other invertebrate genera and rock surfaces, and phylotype 5A
occurs on a congener, Alvinella caudata. The 13B and 5A phylotypes were
identified and localized on A. pompejana by in situ hybridization,
demonstrating that these two phylotypes are, in fact, the prominent
filamentous bacteria on the dorsal integument of A. pompejana. These
findings indicate that the filamentous bacterial symbionts of A. pompejana
are epsilon Proteobacteria which do not have an obligate requirement for A.
pompejana.
Copyright © 1997, American Society for Microbiology
Molecular Identification and Localization of Filamentous Symbiotic Bacteria Associated with the Hydrothermal Vent Annelid Alvinella pompejana
College of Marine Studies, University of Delaware, Lewes, Delaware 19958; Recombinant Biocatalysis, Inc., La Jolla, California 92037; Department of Botany, Oregon State University, Corvallis, Oregon 97331; and IFREMER, Centre de Brest, F-29273 Brest Cedex, France
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