title: DDT uptake by arbuscular mycorrhizal alfalfa and depletion in soil as influenced by soil application of a non-ionic surfactant.
abstract: A greenhouse pot experiment was conducted to investigate the colonization of alfalfa roots by the arbuscular mycorrhizal (AM) fungus Glomus etunicatum and application of the non-ionic surfactant Triton X-100 on DDT uptake by alfalfa and depletion in soil. Mycorrhizal colonization led to an increase in the accumulation of DDT in roots but a decrease in shoots. The combination of AM inoculation and Triton X-100 application enhanced DDT uptake by both the roots and shoots. Application of Triton X-100 gave much lower residual concentrations of DDT in the bulk soil than in the rhizosphere soil or in the bulk soil without Triton X-100. AM colonization significantly increased bacterial and fungal counts and dehydrogenase activity in the rhizosphere soil. The combined AM inoculation of plants and soil application of surfactant may have potential as a biotechnological approach for the decontamination of soil polluted with DDT.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
authors.forename: Naiying
authors.initials: N
authors.lastname: Wu
authors.forename: Shuzhen
authors.initials: S
authors.lastname: Zhang
authors.forename: Honglin
authors.initials: H
authors.lastname: Huang
authors.forename: Xiaoquan
authors.initials: X
authors.lastname: Shan
authors.forename: Peter
authors.initials: P
authors.lastname: Christie
authors.forename: Youshan
authors.initials: Y
authors.lastname: Wang
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D002681:China; D003634:DDT / Q000032:analysis / Q000493:pharmacokinetics*; D004463:Ecology / Q000379:methods; D000455:Medicago sativa / Q000737:chemistry / Q000378:metabolism*; D038821:Mycorrhizae / Q000737:chemistry / Q000378:metabolism*; D012987:Soil / Q000032:analysis; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000493:pharmacokinetics*; D013501:Surface-Active Agents / Q000494:pharmacology*; D013559:Symbiosis
chemical_list: D012987:Soil; D012989:Soil Pollutants; D013501:Surface-Active Agents; D003634:DDT