| Enhanced phenanthrene biodegradation in soil by slender oat root exudates and root debris. | |
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MedLine Citation:
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PMID: 11789996 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To investigate the mechanisms by which slender oat (Avena barbata Pott ex Link) enhances phenanthrene biodegradation, we analyzed the impacts of root exudates and root debris on phenanthrene biodegradation and degrader community dynamics. Accelerated phenanthrene biodegradation rates occurred in soils amended with slender oat root exudates as well as combined root debris + root exudate as compared with unamended controls. Root exudates significantly enhanced phenanthrene biodegradation in rhizosphere soils, either by increasing contaminant bioavailability and/or increasing microbial population size and activity. A modified most probable number (MPN) method was used to determine quantitative shifts in heterotrophic and phenanthrene degrader communities. During the first 4 to 6 d of treatment, heterotrophic populations increased in all amended soils. Both root debris-amended and exudate-amended soil then maintained larger phenanthrene degrader populations than in control soils later in the experiment after much of the phenanthrene had been utilized. Thus, root amendments had a greater impact over time on phenanthrene degraders than heterotrophs resulting in selective maintenance of degrader populations in amended soils compared with controls. |
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Authors:
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R K Miya; M K Firestone |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of environmental quality Volume: 30 ISSN: 0047-2425 ISO Abbreviation: J. Environ. Qual. Publication Date: 2001 Nov-Dec |
Date Detail:
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Created Date: 2002-01-14 Completed Date: 2002-05-07 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0330666 Medline TA: J Environ Qual Country: United States |
Other Details:
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Languages: eng Pagination: 1911-8 Citation Subset: IM |
Affiliation:
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Department of Environmental Science, Policy, and Management, Ecosystem Sciences Div., Univ. of California, Berkeley 94720-3110, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Avena sativa
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physiology* Biodegradation, Environmental Biological Availability Phenanthrenes / metabolism* Plant Roots Population Dynamics Soil Microbiology* Soil Pollutants / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Phenanthrenes; 0/Soil Pollutants; 85-01-8/phenanthrene |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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