Determining the Impact of the AM-Mycorrhizosphere on “Dwarf” Sunflower Zn Uptake and Soil-Zn Bioavailability

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dc.contributor.authorAudet, Patrick
dc.contributor.authorCharest, Christiane
dc.date.accessioned2010-11-26T21:25:20Z
dc.date.available2010-11-26T21:25:20Z
dc.date.created2010
dc.date.issued2010-11-26T21:25:20Z
dc.identifier.urihttp://hdl.handle.net/10393/19675
dc.description.abstractAn in vivo compartmental pot greenhouse experiment involving “dwarf ” sunflower and an arbuscular mycorrhizal (AM) fungus was designed to assess the contribution of non-AM roots (rhizosphere), AM roots and extraradical hyphae (mycorrhizosphere), or strictly extraradical hyphae (hyphosphere) on plant growth, plant metal uptake, and soil parameters using the micronutrient zinc (Zn) as a typical metal contaminant.We observed that, at high soil-Zn concentrations, the mycorrhizosphere treatments had lower Zn concentrations (especially in shoots and flowers) and a lower incidence of leaf chlorosis than the rhizosphere treatments. These phytoprotective effects are believed to be related to AM-induced biosorption processes that reduce soil metal bioavailability to delay the onset of plant metal toxicity.We also observed that the presence of extraradical hyphae causes a slight alkalinisation of the proximal soil environment whereas roots tended to acidify it, this having significant consequences towardmetal bioavailability. Altogether, the AM symbiosis is considered to be a key component of ecosystem function involved in buffering plant growth conditions due to the processes of metal biosorption and hyphal alkalinisation which could contribute in enhancing the soil's resiliency.
dc.language.isoen
dc.titleDetermining the Impact of the AM-Mycorrhizosphere on “Dwarf” Sunflower Zn Uptake and Soil-Zn Bioavailability
dc.typeArticle
dc.identifier.doi10.1155/2010/268540
CollectionBiologie // Biology
Publications en libre accès financées par uOttawa // uOttawa financed open access publications

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