Constitutive mineralization of low concentrations of the herbicide linuron by a Variovorax sp. strain.
The mineralization of the herbicide linuron at concentrations of microg and mg L(-1) was studied in liquid batch experiments with Variovorax sp. strain SRS16. The strain was highly efficient at mineralizing a range of linuron concentrations (0.002-10 mg L(-1)) with 20-60% of the added (14)C-ring-labeled linuron metabolized to (14)CO(2) within hours to days depending on the initial linuron concentration and incubation period. At mg L(-1) linuron concentrations the mineralization activity by SRS16 was inducible and a shift to constitutive mineralization activity was apparent with a reduction in the linuron concentration to microg L(-1) levels. This study revealed that strain SRS16 is a promising candidate for bioaugmentation of water or soil resources contaminated with low linuron concentrations.
Sørensen
Sebastian R
SR
Department of Geochemistry, Geological Survey of Denmark and Greenland (GEUS), Copenhagen K, Denmark. srs@geus.dk
Simonsen
Allan
A
Aamand
Jens
J
D018533:Biomass; D001711:Biotransformation; D002245:Carbon Dioxide / Q000378:metabolism; D002250:Carbon Radioisotopes / Q000378:metabolism; D042621:Comamonadaceae / Q000254:growth & development / Q000378:metabolism*; D006540:Herbicides / Q000378:metabolism*; D008044:Linuron / Q000378:metabolism*; D013194:Staining and Labeling
D002250:Carbon Radioisotopes; D006540:Herbicides; D008044:Linuron; D002245:Carbon Dioxide