title: Phytoremediation effect of Scirpus triqueter inoculated plant-growth-promoting bacteria (PGPB) on different fractions of pyrene and Ni in co-contaminated soils.
abstract: At present, few reveal the mechanism of inoculation plants with PGPB to remediate PAH-metal co-contaminated soil by analyzing the chemical speciations of contaminants. This study investigated the influence of inoculation plants with PGPB on different fractions of pyrene and Ni in rhizospheric and non-rhizospheric soil. The results demonstrated that the addition of PGPB brought the extensive increase of FDA activities in pyrene-Ni co-contaminated soil. PGPB increased the resistance of plants in nickel and pyrene-Ni contaminated soil, but decreased the plant biomass in single pyrene contaminated soil. The addition of PGPB efficiently decreased bioaccessible fractions of pyrene and increased the bioavailability of Ni in both rhizospheric and non-rhizospheric soil. Although inoculation plants with PGPB significantly increased the accumulation of Ni in single Ni and pyrene-Ni co-contaminated soil, the poor bioavailability of Ni in rhizospheric soil still restricted the phytoremediation of the heavy metal. The presence of pyrene hindered the inoculated plant from accumulating Ni to some extent. On the contrary, the presence of Ni significantly promoted the degradation of pyrene in both rhizospheric and non-rhizospheric soil after inoculation plants with PGPB.
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai 200444, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Chen
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai 200444, China. Electronic address: Lxy999@shu.edu.cn.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Liu
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai 200444, China.
authors.forename: Xinying
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai 200444, China.
authors.forename: Liya
authors.initials: L
authors.lastname: Cao
authors.affiliation: Laboratory of environmental remediation, College of environmental and chemical engineering, Shanghai University, Shanghai 200444, China.
authors.forename: Xiaoxin
authors.initials: X
authors.lastname: Hu
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D029785:Cyperaceae / Q000378:metabolism*; D007210:Indoleacetic Acids / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis; D009532:Nickel / Q000032:analysis*; D010710:Phosphates / Q000737:chemistry; D063245:Plant Development; D018517:Plant Roots / Q000378:metabolism; D011721:Pyrenes / Q000378:metabolism; D058441:Rhizosphere; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D007210:Indoleacetic Acids; D019216:Metals, Heavy; D010710:Phosphates; D011721:Pyrenes; D012989:Soil Pollutants; C030737:indoleacetic acid; D009532:Nickel; C030984:pyrene
keywords: PGPB; Pyrene and Ni co-contaminated soil; Rhizosphere and non-rhizosphere; Scirpus triqueter; Transformation of chemical speciations