Abstract: wo strains of bacteria TOB1 and TOB2, belonging to Acinetobacter sp. and Pseudomonas sp., which could grow and degrade topramezone (500 and 5 mg/L), were isolated and screened from corn field soil with topramezone by enrichment and domestication, species identification and high performance liquid chromatography (HPLC). The strains of TOB1 and TOB2 have strong tolerance and degradation ability on the topramezone and the good application potential for the soil bioremediation of the pollution of the topramezone.

Key words: topramezone, bacteria, isolation and identification, microbial degradation, soil remediation