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Spatial distribution and transcriptional activity of an uncultured clade of planktonic diazotrophic γ-proteobacteria in the Arabian Sea

Lookup NU author(s): Professor Anthony O'Donnell


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The spatial distribution of an uncultured clade of marine diazotrophic γ-proteobacteria in the Arabian Sea was investigated by the development of a specific primer pair to amplify an internal fragment of nifH by PCR. These organisms were most readily detected in highly oligotrophic surface waters but could also be found in deeper waters below the nutricline. nifH transcripts originating from this clade were detected in oligotrophic surface waters and, in addition, in the deeper and the more productive near-coastal waters. The nifH sequences most closely related to the unidentified marine bacterial group are from environmental clones amplified from the Atlantic and Pacific Oceans. These findings suggest that these γ-proteobacteria are widespread and likely to be an important component of the heterotrophic diazotrophic microbial community of the tropical and subtropical oceans. Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Publication metadata

Author(s): Bird C, Martinez JM, O'Donnell AG, Wyman M

Publication type: Article

Publication status: Published

Journal: Applied and Environmental Microbiology

Year: 2005

Volume: 71

Issue: 4

Pages: 2079-2085

Print publication date: 01/04/2005

ISSN (print): 0099-2240

ISSN (electronic): 1098-5336

Publisher: American Society for Microbiology


DOI: 10.1128/AEM.71.4.2079-2085.2005

PubMed id: 15812041


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