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Chlorpyrifos is one of the major organophosphorous pesticides used in agriculture to control insect pests. Due to the widespread toxicity of chlorpyrifos in the environment, exploration of various chlorpyrifos-degrading microbes to clean-up the pollutant is of immense importance. A bacterial strain (Cellulomonas fimi), that could transform chlorpyrifos to 3,5,6-trichloro-2 pyridinol (TCP) and a TCP utilizing fungal strain (Phanerochaete chrysosporium) were obtained from microbial type culture collection (MTCC), microbial type of culture collection, Chandigarh. The fungus could also degrade 50 mg chlorpyrifos L-1 within 6 days. Co culture completely mineralized 50 mg chlorpyrifos L-1 with 16 h at 33oC and at pH 8.4 using a total inoculam of 0.13 g biomass L-1. These results showed that, the chlorpyrifos degrading bacterial and fungal strains had the potential to clean up the organophosphorous pesticide-contaminated environment.       Key words: Chlorpyrifos, organophosphorous, Mineralization, Cellulomonas fimi, Phanerochaete chrysosporium.

Biodegradation of chlorpyrifos by co-culture of Cellulomonas fimi and Phanerochaete chrysosporium