title: Biodegradation of bensulfuron-methyl and its effect on bacterial community in paddy soils.
abstract: Bensulfuron-methyl (BSM) is a new kind of sulfonylurea herbicide widely used to control broad-leaf weeds in rice paddies. The aim of this work was to study BSM biodegradation in paddy soils with BSM-degrading bacteria Bacillus megaterium L1 and Brevibacterium sp. BH and its effect on the structures of soil bacterial community. More than 90 % of BSM could be degraded in paddy soils with 0.0355 mg kg⁻¹ BSM concentration. Addition of BSM-degrading bacterial strains Bacillus megaterium L1 into BSM contaminated paddy soil could have the half-life time of BSM compared to treatment without Bacillus megaterium L1 inoculation. Denaturing gradient gel electrophoresis and principle component analysis indicated that the diversity of the soil microbial community structure changed along with the addition of BSM, which recovered at the end of the experiment (5 weeks). Addition of BSM-degrading bacteria Bacillus megaterium L1 enriched the diversity of soil microbial community structure in paddy soils. This study provides information on the biodegradation of BSM and BSM's influences on the soil bacteria microbial community structures.
authors.affiliation: Rice Product Quality Inspection and Supervision Testing Center, China National Rice Research Institute, Hangzhou 310006, People's Republic of China. fzhlxy@yahoo.com
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Lin
authors.forename: Yu-Yi
authors.initials: YY
authors.lastname: Yang
authors.forename: Yu-Hua
authors.initials: YH
authors.lastname: Zhao
authors.forename: Qing-Lin
authors.initials: QL
authors.lastname: Fu
mesh_terms: D001410:Bacillus megaterium / Q000187:drug effects* / Q000254:growth & development; D001673:Biodegradation, Environmental; D001951:Brevibacterium / Q000187:drug effects* / Q000254:growth & development; D004269:DNA, Bacterial / Q000235:genetics / Q000302:isolation & purification; D006207:Half-Life; D006540:Herbicides / Q000633:toxicity*; D012275:Oryza; D010802:Phylogeny; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000633:toxicity*; D013453:Sulfonylurea Compounds / Q000633:toxicity*
chemical_list: D004269:DNA, Bacterial; D006540:Herbicides; D012989:Soil Pollutants; D013453:Sulfonylurea Compounds; C071475:methyl bensulfuron