Phytoremediation of metal contaminated soil using willow: exploiting plant-associated bacteria to improve biomass production and metal uptake.

Jolien Janssen, Nele Weyens, Sarah Croes, Bram Beckers, Linda Meiresonne, Pierre Van Peteghem, Robert Carleer, Jaco Vangronsveld

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    Abstract

    Short rotation coppice (SRC) of willow and poplar is proposed for economic valorization and concurrently as remediation strategy for metal contaminated land in northeast-Belgium. However, metal phytoextraction appears insufficient to effectuate rapid reduction of soil metal contents. To increase both biomass production and metal accumulation of SRC, two strategies are proposed: (i) in situ selection of the best performing clones and (ii) bioaugmentation of these
    clones with beneficial plant-associated bacteria. Based on field data, two experimental willow clones, a Salix viminalis and a Salix alba x alba clone, were selected. Compared to the best performing commercial clones, considerable increases in stem metal extraction were achieved (up to 74% for Cd and 91% for Zn). From the selected clones, plant-associated bacteria were isolated and identified. All strains were subsequently screened for their plant growth-promoting and metal uptake enhancing traits. Five strains were selected for a greenhouse inoculation experiment with the selected clones planted in Cd-Zn-Pb contaminated soil. Extraction potential tended to increase after inoculation of S. viminalis plants with a Rahnella sp. strain due to a significantly increased twig biomass. However, although bacterial strains showing beneficial traits in vitro were used for inoculation, increments in extraction potential were not always
    observed.
    Original languageEnglish
    JournalInternational journal of phytoremediation
    Issue number17
    Pages (from-to)1123-1136
    Number of pages14
    ISSN1522-6514
    Publication statusPublished - May-2015

    Thematic list

    • Pollution

    EWI Biomedical sciences

    • B270-plant-ecology

    Taxonomic list

    • willow family (Salicaceae)

    Policy

    • soil protection

    Geographic list

    • Flanders

    Technological

    • restoration techniques

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