Abstract
Brassica juncea was grown in a soil spiked with selenium oxyanions (selenite and selenate) in order to verify the contribution of both plants and rhizospheric bacteria to the abatement of soluble forms of the metalloid. A mass balance of selenium was calculated in pots and the different chemical species of this contaminant were measured. Evidence gained suggests that selenium oxyanions were reduced into less bioavailable forms thank to a marked contribution of the soil bacterial population. Rhizobacteria resulted particularly elicited by the presence of B. juncea which directly participated in selenium decontamination through either phytoextraction or putative volatilisation. Moreover, these microbes colonizing B. juncea root system were monitored by both culture dependent and culture independent methods (i.e. DGGE analysis). Finally, bacterial isolates were tested in vitro for their resistance to selenium oxyanions.
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Acknowledgements
Funding for this study was provided by the Italian National Council For Scientific Research (CNR) through the Grant CNRC00F1D5-001. Authors thank Dr. Francesco Petacco (Azienda Agricola Corte Santȁ9Alda, Mezzane di Sotto, Verona) for his skillfull technical assistance.
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Di Gregorio, S., Lampis, S., Malorgio, F. et al. Brassica juncea can improve selenite and selenate abatement in selenium contaminated soils through the aid of its rhizospheric bacterial population. Plant Soil 285, 233–244 (2006). https://doi.org/10.1007/s11104-006-9010-x
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DOI: https://doi.org/10.1007/s11104-006-9010-x