title: Enhanced remediation of chlorpyrifos by ryegrass (Lolium multiflorum) and a chlorpyrifos degrading bacterial endophyte Mezorhizobium sp. HN3.
abstract: For effective remediation of contaminants, plant-endophyte partnership is a promising field to be explored. Generally endophytic bacteria assist their host plant by withstanding the stress induced by the contaminants. The objective of this study was to explore the suitability of plant-bacterial partnership for chlorpyrifos (CP) remediation using ryegrass and a CP degrading endophyte, Mesorhizobium sp. HN3 which belongs to plant growth promoting rhizobia. The inoculated yfp-tagged Mesorhizobium sp. HN3 efficiently colonized in the rhizosphere, enhanced plant growth and degradation of CP and its metabolite 3,5,6 trichloro-2-pyridinol (TCP). Significantly lower CP residues were observed in the roots and shoots of plants vegetated in inoculated soil which might be attributed to the efficient root colonization of HN3yfp. These results suggest the involvement of Mesorhizobium sp. HN3yfp in CP degradation inside the roots and rhizosphere of plants and further emphasize on the effectiveness of endophytic bacteria in stimulating the remediation of pesticide contaminants. This is the first report which demonstrates the efficacy of bacterial endophyte for degradation of CP residues taken up by the plant and enhanced remediation of chlorpyrifos contaminated soil.
authors.affiliation: a Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) , Faisalabad , Pakistan.|b Pakistan Institute of Engineering and Applied Sciences (PIEAS) , Islamabad , Pakistan.
authors.forename: Hina
authors.initials: H
authors.lastname: Jabeen
authors.affiliation: a Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) , Faisalabad , Pakistan.|b Pakistan Institute of Engineering and Applied Sciences (PIEAS) , Islamabad , Pakistan.
authors.forename: Samina
authors.initials: S
authors.lastname: Iqbal
authors.affiliation: a Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) , Faisalabad , Pakistan.
authors.forename: Fiaz
authors.initials: F
authors.lastname: Ahmad
authors.affiliation: a Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) , Faisalabad , Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Afzal
authors.affiliation: a Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) , Faisalabad , Pakistan.|b Pakistan Institute of Engineering and Applied Sciences (PIEAS) , Islamabad , Pakistan.
authors.forename: Sadiqa
authors.initials: S
authors.lastname: Firdous
mesh_terms: D001673:Biodegradation, Environmental; D004390:Chlorpyrifos / Q000378:metabolism*; D060026:Endophytes / Q000378:metabolism*; D008129:Lolium / Q000378:metabolism*; D059128:Mesorhizobium / Q000378:metabolism*; D058441:Rhizosphere; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*
chemical_list: D012989:Soil Pollutants; D004390:Chlorpyrifos
keywords: 3,5,6-trichloro-2-pyridinol; Mesorhizobium sp; biodegradation; chlorpyrifos; plant-endophyte partnership