Dynamics of arbuscular mycorrhizal symbiosis in heavy metal phytoremediation: Meta-analytical and conceptual perspectives

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dc.contributor.authorAudet, Patrick
dc.contributor.authorCharest, Christiane
dc.date.accessioned2010-06-30T17:53:20Z
dc.date.available2010-06-30T17:53:20Z
dc.date.created2007
dc.date.issued2007
dc.identifier.citationEnvironmental Pollution, 147(3), 609-614.
dc.identifier.urihttp://hdl.handle.net/10393/12931
dc.description.abstractTo estimate dynamics of arbuscular mycorrhizal (AM) symbiosis in heavy metal (HM) phytoremediation, we conducted a literature survey and correlated HM uptake and relative plant growth parameters from published data. After estimating AM feedback responses for these parameters at low and high soil-HM concentration intervals, we determined that the roles of AM symbiosis are characterized by (1) an increased HM phytoextraction via mycorrhizospheric 'Enhanced Uptake' at low soil-HM concentrations, and (2) a reduced HM bioavailability via AM fungal 'Metal-Binding' processes at high soil-HM levels, hence resulting in increased plant biomass and enhanced plant tolerance through HM stress-avoidance. We present two conceptual models which illustrate the important compromise between plant growth, plant HM uptake and HM tolerance, and further emphasize the importance of AM symbiosis in buffering the soil environment for plants under such stress conditions. This meta-analysis has revealed a transition role of the AM symbiosis in phytoremediation shifting from 'Enhanced Uptake' to 'Metal-Binding' beyond critical soil-HM levels.
dc.description.sponsorshipThis research was funded by a grant from the Natural Sciences and Engineering Research Council of Canada (NSERC).
dc.language.isoen
dc.subjectStress-avoidance
dc.subjectHM phytotoxicity
dc.subjectHM bioavailability
dc.subjectAM feedback
dc.titleDynamics of arbuscular mycorrhizal symbiosis in heavy metal phytoremediation: Meta-analytical and conceptual perspectives
dc.typeArticle
dc.identifier.doi10.1016/j.envpol.2006.10.006
CollectionBiologie // Biology

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