Document Detail


Higher nitrate-reducer diversity in macrophyte-colonized compared to unvegetated freshwater sediment.
MedLine Citation:
PMID:  23041409     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Michael V W Kofoed; Peter Stief; Sandra Hauzmayer; Andreas Schramm; Martina Herrmann
Related Documents :
967269 - Progress in biochemical engineering.
23603959 - Coupled expression of cu/zn-superoxide dismutase and catalase in cassava improves toler...
21348519 - Influence of pyrolysis temperature on biochar property and function as a heavy metal so...
12870639 - Technical, economic and environmental feasibility of recycling nutrients in waste in so...
20183499 - Reduction of carbon content in waste-tire combustion ashes by bio-thermal treatment.
17509859 - Influence of waste input and combustion technology on mswi bottom ash quality.
21421389 - Urea metabolism in plants.
11218809 - Pre-clinical toxicity evaluation of leaf-stalk extractive of piper betle linn. in rodents.
24084889 - Crucial role of the biological barrier at the primary targeted organs in controlling th...
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.
Affiliation:
Department of Biological Sciences, Microbiology, Aarhus University, Ny Munkegade 114, DK-8000 Aarhus C, Denmark.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Hemangioblastoma stromal cells show committed stem cell phenotype.
Next Document:  In vitro radiosensitization by gold nanoparticles during continuous low-dose-rate gamma irradiation ...