title: Behavior of decabromodiphenyl ether (BDE-209) in soil: effects of rhizosphere and mycorrhizal colonization of ryegrass roots.
abstract: A rhizobox experiment was conducted to investigate degradation of decabromodiphenyl ether (BDE-209) in the rhizosphere of ryegrass and the influence of root colonization with an arbuscular mycorrhizal (AM) fungus. BDE-209 dissipation in soil varied with its proximity to the roots and was enhanced by AM inoculation. A negative correlation (P < 0.001, R(2) = 0.66) was found between the residual BDE-209 concentration in soil and soil microbial biomass estimated as the total phospholipid fatty acids, suggesting a contribution of microbial degradation to BDE-209 dissipation. Twelve and twenty-four lower brominated PBDEs were detected in soil and plant samples, respectively, with a higher proportion of di- through hepta-BDE congeners in the plant tissues than in the soils, indicating the occurrence of BDE-209 debromination in the soil-plant system. AM inoculation increased the levels of lower brominated PBDEs in ryegrass. These results provide important information about the behavior of BDE-209 in the soil-plant system.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
authors.forename: Sen
authors.initials: S
authors.lastname: Wang
authors.forename: Shuzhen
authors.initials: S
authors.lastname: Zhang
authors.forename: Honglin
authors.initials: H
authors.lastname: Huang
authors.forename: Peter
authors.initials: P
authors.lastname: Christie
mesh_terms: D005411:Flame Retardants / Q000032:analysis / Q000378:metabolism; D005658:Fungi / Q000187:drug effects / Q000378:metabolism; D055137:Glomeromycota / Q000378:metabolism; D055768:Halogenated Diphenyl Ethers / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D008129:Lolium / Q000187:drug effects / Q000378:metabolism / Q000382:microbiology*; D038821:Mycorrhizae / Q000187:drug effects / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism*; D018520:Plant Shoots / Q000378:metabolism; D011075:Polybrominated Biphenyls / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D058441:Rhizosphere; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*
chemical_list: D005411:Flame Retardants; D055768:Halogenated Diphenyl Ethers; D011075:Polybrominated Biphenyls; D012989:Soil Pollutants; C010902:decabromobiphenyl ether