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  Ammonia-oxidizing β-Proteobacteria from the oxygen minimum zone off northern Chile

Molina, V., Ulloa, O., Farías, L., Urrutia, H., Ramírez, S., Junier, P., et al. (2007). Ammonia-oxidizing β-Proteobacteria from the oxygen minimum zone off northern Chile. Applied and Environmental Microbiology, 73(11), 3547-3555. doi:10.1128/AEM.02275-06.

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Molina, Verónica1, Autor           
Ulloa, Osvaldo, Autor
Farías, Laura, Autor
Urrutia, Homero, Autor
Ramírez, Salvador, Autor
Junier, Pilar1, Autor           
Witzel, Karl-Paul1, Autor           
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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 Zusammenfassung: The composition of ammonia-oxidizing bacteria from the β-Proteobacteria subclass (βAOB) was studied in the surface and upper-oxycline oxic waters (2- to 50-m depth, similar to 200 to 44 mu M O-2) and within the oxygen minimum zone (OMZ) suboxic waters (50- to 400-m depth, <= 10 mu M O-2) of the eastern South Pacific off northern Chile. This study was carried out through cloning and sequencing of genes coding for 16S rRNA and the ammonia monooxygenase enzyme active subunit (amoA). Sequences affiliated with Nitrosospira-like cluster 1 dominated the 16S rRNA gene clone libraries constructed from both oxic and suboxic waters. Cluster 1 consists exclusively of yet-uncultivated beta AOB from marine environments. However, a single clone, out of 224 obtained from the OMZ, was found to belong to Nitrosospira lineage cluster 0. To our knowledge, cluster 0 sequences have been derived from βAOB isolated only from sand, soil, and freshwater environments. Sequences in clone libraries of the amoA gene from the surface and upper oxycline could be grouped in a marine subcluster, also containing no cultured representatives. In contrast, all 74 amoA sequences originating from the OMZ were either closely affiliated with cultured Nitrosospira spp. from clusters 0 and 2 or with other yet-uncultured βAOB from soil and an aerated-anoxic Orbal process waste treatment plant. Our results reveal the presence of Nitrosospira-like βAOB in both oxic and suboxic waters associated with the OMZ but with a clear community shift at the functional level (amoA) along the strong oxygen gradient.

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Sprache(n): eng - English
 Datum: 2007-06
 Publikationsstatus: Erschienen
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 Identifikatoren: eDoc: 319798
DOI: 10.1128/AEM.02275-06
Anderer: 2565/S 38715
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Titel: Applied and Environmental Microbiology
  Alternativer Titel : Appl. Environ. Microbiol.
Genre der Quelle: Zeitschrift
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Seiten: - Band / Heft: 73 (11) Artikelnummer: - Start- / Endseite: 3547 - 3555 Identifikator: ISSN: 0099-2240