alexa Development and utilisation of a medium to isolate phenanthrene-degrading Pseudomonas spp.
Environmental Sciences

Environmental Sciences

Journal of Petroleum & Environmental Biotechnology

Author(s): Andersen SM, Jrgensen C, Jacobsen CS

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Abstract In this study, we isolated phenanthrene degraders belonging to Pseudomonas spp. by combining the selective force of two previously described media. The two compounds, sodium lauryl sarcosine and trimethoprim, from the Gould S1 medium, were added to minimal agar plates sprayed with phenanthrene. Pseudomonas spp. that could produce clearing zones were isolated in one step from the rhizosphere without first selecting for Pseudomonas spp. and subsequently screening for degraders or vice versa. Enumeration and isolation of Pseudomonas spp. attached to the rhizosphere showed clear differences between two types of soil. Rhizosphere-attached phenanthrene degraders (from Pseudomonas spp.) were isolated from a former coal gasification site, but were absent in an agricultural soil subjected to organic farming. We isolated 23 phenanthrene degraders producing clearing zones from the rhizosphere of barley roots. All of these 23 isolates (of which 16 were fluorescent in UV light) proved to be members of the Pseudomonas RNA homology group I, on the basis of results of the analytical profile index (API) test system and classic taxonomic tests.
This article was published in Appl Microbiol Biotechnol and referenced in Journal of Petroleum & Environmental Biotechnology

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