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Appl. Environ. Microbiol. doi:10.1128/AEM.02802-07
Copyright (c) 2008, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

Archaea Dominate the Ammonia-oxidizing Community in the Rhizosphere of the Freshwater Macrophyte Littorella uniflora

Department of Biological Sciences, Microbiology, University of Aarhus, Ny Munkegade, Building 1540, DK-8000 Aarhus C, Denmark; Department of Chemistry and Water Technology, Danish Technological Institute, Kongsvang Allé 29, DK-8000 Aarhus C, Denmark

^* To whom correspondence should be addressed. Email: andreas.schramm{at}biology.au.dk.

	Abstract

Archaeal and bacterial ammonia monooxygenase genes (amoA) had similar low relative abundances in freshwater sediment. In the rhizosphere of the submersed macrophyte Littorella uniflora, archaeal amoA was 500- to >8000-fold enriched compared to bacterial amoA, suggesting that the enhanced nitrification activity observed in the rhizosphere was due to ammonia-oxidizing Archaea.