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Title
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Response to mixed substrate feeds of the structure and activity of a linuron-degrading triple-species biofilm
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Author
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Abstract
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| We sought to determine whether the pesticide-degrading performance of a multi-species bacterial biofilm is affected by co-occurrence of multiple nutrient sources Thus, the 3-(3,4-dichlorophenyl)-l-methoxy-l-methyl urea (linuron)-degrading activity of a triple-species linuron-degrading consortium, cultivated in continuous flow biofilm systems, was monitored when exposed to mixed substrate feeds which contained, in addition to linuron, readily assimilated carbon (i e citrate and trypticase soy broth) and/or nitrogen (i e ammonium) sources The addition of alternative carbon sources at different concentrations resulted in diminished linuron degradation efficiency In addition, the efficiency of removal of the linuron metabolite 3,4-dichloroaniline was affected These effects might be attributed to catabolic repression of the linuron metabolic pathway in the presence of alternative carbon substrates Moreover, each nutrient condition resulted in a particular biofilm composition and a particular spatial and structural organization, which might also be related to the performance of the biofilm community Results show that the activity of pesticide-degrading biofilms strongly depends on prevailing nutrient conditions and that the ideal biofilm configuration and activity, as observed under selective conditions, does not exist in real-life environmental conditions where mixtures of substrates are often present (C) 2010 Elsevier Masson SAS All rights reserved. |
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Language
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English
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Source (journal)
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Research in microbiology / Institut Pasteur [Paris] - Paris, 1989, currens
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Publication
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Paris
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Institut Pasteur
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2010
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ISSN
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0923-2508
[print]
1769-7123
[online]
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DOI
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10.1016/J.RESMIC.2010.06.006
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Volume/pages
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161
:8
(2010)
, p. 660-666
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ISI
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000283686200004
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Full text (Publisher's DOI)
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