title: Enhanced dissipation of PAHs from soil using mycorrhizal ryegrass and PAH-degrading bacteria.
abstract: The major aim of this experiment was to test the effects of a multi-component bioremediation system consisting of ryegrass (Lolium multiflorum), polycyclic aromatic hydrocarbons (PAHs)-degrading bacteria (Acinetobacter sp.), and arbuscular mycorrhizal fungi (Glomus mosseae) for cleaning up PAHs contaminated soil. Higher dissipation rates were observed in combination treatments: i.e., bacteria+ryegrass (BR), mycorrhizae+ryegrass (MR), and bacteria+mycorrhizae+ryegrass (BMR); than bacteria (B) and ryegrass (R) alone. The growth of ryegrass significantly (p<0.05) increased soil peroxidase activities, leading to enhanced dissipation of phenanthrene (PHE) and pyrene (PYR) from soil. Interactions between ryegrass with the two microbes further enhanced the dissipation of PHE and PYR. Mycorrhizal ryegrass (MR) significantly enhanced the dissipation of PYR from soil, PYR accumulation by ryegrass roots and soil peroxidase activities under lower PHE and PYR levels (0 and 50+50 mg kg(-1)). The present results highlighted the contribution of mycorrhiza and PAH-degrading bacteria in phytoremediation of PAH contaminated soil, however more detailed studies are needed.
authors.affiliation: Croucher Institute for Environmental Sciences, Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
authors.forename: X Z
authors.initials: XZ
authors.lastname: Yu
authors.forename: S C
authors.initials: SC
authors.lastname: Wu
authors.forename: F Y
authors.initials: FY
authors.lastname: Wu
authors.forename: M H
authors.initials: MH
authors.lastname: Wong
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D004156:Catechol Oxidase / Q000737:chemistry / Q000378:metabolism; D008129:Lolium / Q000378:metabolism*; D038821:Mycorrhizae / Q000378:metabolism*; D010544:Peroxidases / Q000737:chemistry / Q000378:metabolism; D010616:Phenanthrenes / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry / Q000382:microbiology; D018520:Plant Shoots / Q000737:chemistry / Q000382:microbiology; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D011721:Pyrenes / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D012997:Solvents
chemical_list: D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; D012987:Soil; D012997:Solvents; D004156:Catechol Oxidase; D010544:Peroxidases