Screening，identification and characterization of a quinclorac-degrading Arthrobacter sp．MC-10

Abstract:

Abstract:［Objective］ We screened and isolated bacterial strains from the perennial administration quinclorac paddy fields to degrade quinclorac．［Methods］ Strain MC-10，which can degrade quinclorac efficiently，was screened by enrichment and selective medium． The strain was identified by morphological，physio-biochemical characteristics and 16S rDNA gene sequence analysis．［Results］MC-10 was identified as Arthrobacter sp．Under the optimal growth conditions with inoculum concentration of 5% ，at 28 C，pH 7 for 7 d，MC-10 degraded more than 90% of quinclorac．MC-10 can effectively degrade quinclorac when quinclorac initial concentration at 1 mg/L－100 mg/L．And the strain MC-10 has a good ability to survive in the soil．More than 70% quinclorac in the soil can be degraded efficiently after 7 days of cultivation．［Conclusion］ Arthrobacter sp．MC-10 could be a promising microorganism in dealing with quinclorac pollution．