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Higher nitrate-reducer diversity in macrophyte-colonized compared to unvegetated freshwater sediment.
MedLine Citation:
PMID:  23041409     Owner:  NLM     Status:  Publisher    
Freshwater macrophytes stimulate rhizosphere-associated coupled nitrification-denitrification and are therefore likely to influence the community composition and abundance of rhizosphere-associated denitrifiers and nitrate reducers. Using the narG gene, which encodes the catalytic subunit of the membrane-bound nitrate reductase, as a molecular marker, the community composition and relative abundance of nitrate-reducing bacteria were compared in the rhizosphere of the freshwater macrophyte species Littorella uniflora and Myriophyllum alterniflorum to nitrate-reducing communities in unvegetated sediment. Microsensor analysis indicated a higher availability of oxygen in the rhizosphere compared to unvegetated sediment, with a stronger release of oxygen from the roots of L. uniflora compared to M. alterniflorum. Comparison of narG clone libraries between samples revealed a higher diversity of narG phylotypes in association with the macrophyte rhizospheres compared to unvegetated sediment. Quantitative PCR targeting narG- and 16S rRNA-encoding genes pointed to a selective enrichment of narG gene copies in the rhizosphere. The results suggested that the microenvironment of macrophyte rhizospheres, characterized by the release of oxygen and labile organic carbon from the root system, had a stimulating effect on the diversity and relative abundance of rhizosphere-associated nitrate reducers.
Michael V W Kofoed; Peter Stief; Sandra Hauzmayer; Andreas Schramm; Martina Herrmann
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-4
Journal Detail:
Title:  Systematic and applied microbiology     Volume:  -     ISSN:  1618-0984     ISO Abbreviation:  Syst. Appl. Microbiol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8306133     Medline TA:  Syst Appl Microbiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier GmbH. All rights reserved.
Department of Biological Sciences, Microbiology, Aarhus University, Ny Munkegade 114, DK-8000 Aarhus C, Denmark.
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