title: Nitrogen impacts on atrazine-degrading Arthrobacter strain and bacterial community structure in soil microcosms.
abstract: The objective of this study was to investigate the impacts of exogenous nitrogen on a microbial community inoculated with the atrazine-degrading Arthrobacter sp. in soil amended with a high concentration of atrazine. Inoculated and uninoculated microcosms for biodegradation tests were constructed. Atrazine degradation capacity of the strain DAT1 and the strain's atrazine-metabolic potential and survival were assessed. The relative abundance of the strain DAT1 and the bacterial community structure in soils were characterized using quantitative PCR in combination with terminal restriction fragment length polymorphism. Atrazine degradation by the strain DAT1 and the strain's atrazine-metabolic potential and survival were not affected by addition of a medium level of nitrate, but these processes were inhibited by addition of a high level of nitrate. Microbial community structure changed in both inoculated and uninoculated microcosms, dependent on the level of added nitrate. Bioaugmentation with the strain DAT1 could be a very efficient biotechnology for bioremediation of soils with high concentrations of atrazine.
authors.affiliation: State Key Laboratory of Ecohydraulic Engineering in Shaanxi, Xi'an University of Technology, Xi'an 710048, China.
authors.forename: Xiaode
authors.initials: X
authors.lastname: Zhou
authors.forename: Qingfeng
authors.initials: Q
authors.lastname: Wang
authors.forename: Zhao
authors.initials: Z
authors.lastname: Wang
authors.forename: Shuguang
authors.initials: S
authors.lastname: Xie
mesh_terms: D054458:Amplified Fragment Length Polymorphism Analysis; D001173:Arthrobacter / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D001280:Atrazine / Q000032:analysis / Q000378:metabolism* / Q000494:pharmacology; D001426:Bacterial Proteins / Q000235:genetics; D001673:Biodegradation, Environmental; D002851:Chromatography, High Pressure Liquid; D006540:Herbicides / Q000032:analysis / Q000378:metabolism* / Q000494:pharmacology; D059013:Microbial Consortia / Q000187:drug effects* / Q000235:genetics; D009566:Nitrates / Q000008:administration & dosage / Q000494:pharmacology*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000008:administration & dosage / Q000032:analysis / Q000378:metabolism* / Q000494:pharmacology
chemical_list: D001426:Bacterial Proteins; D006540:Herbicides; D009566:Nitrates; D012989:Soil Pollutants; D001280:Atrazine