Enhanced phytoextraction of nickel from contaminated soil by hypperaccululator plant co-cropping associated with PGPR.
2015
Benizri, Émile | Piutti, Séverine | RUE, Marie | Durand, Alexis | Morel, Jean-Louis | Echevarria, Guillaume
The objective of this work was first to compare the cropping of single hyperaccumulator plant species (either Alyssum murale, Noccaea tymphaea, Leptoplax emarginata or Bornmuellera tymphaea) with co-cropping of all four species on the efficiency of Ni extraction from a Ni-rich ultramafic soil. Also, the effects on soil physicochemical properties and on microbial communities’ changes colonizing the rhizosphere were evaluated. Secondly, this study aimed at evaluating the effect of selected rhizobacterial strains, isolated from the rhizosphere of one of the different natural plant associations (B. tymphaea – N. tymphaea), on plant biomass production and nickel phytoextraction by these two hyperaccumulator plants. The screening of isolates from this plant association for their PGPR traits revealed one PGPR strain (NB24). The genetic characterization showed that it was similar to Variovorax paradoxus. After 6 months of culture, biomass and quantities of nickel in the plants were assessed. The results showed significant improvement of root growth and an increase of Ni uptake when plants were inoculated with this PGPR strain. The combination Noccaea-Bornmuellera inoculated by the PGPR strain Variovorax NB24, seemed to be a good choice for an efficient phytoextraction in situ.
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