title: Dissipation gradients of phenanthrene and pyrene in the Rice rhizosphere.
abstract: An experiment was conducted to reveal the effects of rice cultivation as well as polycyclic aromatic carbohydrates (PAHs) degrading bacterium (Acinetobacter sp.) on the dissipation gradients of two PAHs (PHE and PYR) in the rhizosphere. The results showed that the presence of rice root and bacteria significantly accelerated the dissipation rate of PHE and PYR. The root exudates contributed to the formation of dissipation gradients of PHE and PYR along the vertical direction of roots, with a higher dissipation rate in the rhizosphere and near rhizosphere zone than the soil far away the rhizosphere.
authors.affiliation: Croucher Institute for Environmental Sciences and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China.
authors.forename: Y
authors.initials: Y
authors.lastname: Gao
authors.forename: S C
authors.initials: SC
authors.lastname: Wu
authors.forename: X Z
authors.initials: XZ
authors.lastname: Yu
authors.forename: M H
authors.initials: MH
authors.lastname: Wong
mesh_terms: D000150:Acinetobacter / Q000378:metabolism; D001673:Biodegradation, Environmental; D002244:Carbon / Q000032:analysis; D005122:Exudates and Transudates / Q000378:metabolism; D012275:Oryza / Q000378:metabolism*; D010616:Phenanthrenes / Q000032:analysis* / Q000378:metabolism; D011721:Pyrenes / Q000032:analysis* / Q000378:metabolism; D027343:Rhizome / Q000378:metabolism; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D010616:Phenanthrenes; D011721:Pyrenes; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; C031181:phenanthrene; D002244:Carbon; C030984:pyrene