2,4-Dichlorophenoxyacetic acid (2,4-D) biodegradation in river sediments of Northeast-Scotland and its effect on the microbial communities (PLFA and DGGE).
Chemosphere
; 64(10): 1675-83, 2006 Sep.
Article
em En
| MEDLINE
| ID: mdl-16488464
A bench-scale study was conducted to investigate 2,4-D biodegradation rates at different concentrations (10, 100 and 1000 microg per gram of dry weight) in distinct sediments samples collected on the River Ythan, Northeast-Scotland. Mineralisation of 14C 2,4-D occurred mostly within 30 days for all tested concentrations with a degradation rate ranging from 5 to 750 microg d(-1). Biodegradation rates were affected by the biological and biochemical characteristics of the indigenous microbial community in the studied sediments rather than factors such as compound bioavailability and/or toxicity. PLFA-profiling provided evidences of the effect of 2,4-D amendments on the microbial communities and DGGE-profiling showed changes in the genetic potential of the microbial populations which might affect metabolic characteristics of the sediment. PLFAs biomarkers suggested that the pathway of alpha-ketoglutarate-dependent dioxygenase was the main route of 2,4-D biodegradation. This pathway is commonly found in microorganisms of the beta-subdivision of proteobacteria.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Microbiologia da Água
/
Poluentes Químicos da Água
/
Sedimentos Geológicos
/
Ácido 2,4-Diclorofenoxiacético
País/Região como assunto:
Europa
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido