Abstract
Copper and zinc are essential micronutrients in plants but, at high concentrations, they are toxic. Assisted phytoremediation is an emerging “green” technology that aims to improve the efficiency of tolerant species to remove metals from soils through the use of chelants or microorganisms. Rhizobacteria can promote plant growth and tolerance and also affect the mobility, bioavailability, and complexation of metals. A pot experiment was conducted to evaluate the phytoremediation effectiveness of sunflowers cultivated in a Cu- and Zn-spiked soil, in the presence or absence of bacterial consortium and/or chelants. The consortium was constituted of two Stenotrophomonas maltophilia strains and one of Agrobacterium sp. These strains were previously isolated from the rhizosphere of maize plants cultivated on a metal-polluted soil and here molecularly and biochemically characterized. Results showed that the consortium improved sunflower growth and biomass production on the spiked soils. Sunflowers accumulated large amounts of metals in their roots and leaves; however, neither the bacterial consortium nor the chelants, singularly added to pots, influenced significantly Cu and Zn plant uptake. Furthermore, the consecutive soil amendment with the EDTA and bacterial consortium determined a consistent accumulation of metals in sunflowers, and it might be an alternative strategy to limit the use of EDTA and its associated environmental risks in phytoremediation.
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Acknowledgments
The research was supported by funds for didactic activity attributed to the course in “Applied Biology and Biodiversity” by the University of Salerno (University degree in Environmental Sciences) and by funds from the FARB project (2013) of the University of Salerno. We also acknowledge Elizabeth Illingworth for the English revision of the manuscript and Giovanni Vigliotta for bacterial strain isolation and MIC determination.
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The original publication of this paper contains a mistake. Author names were inadvertently interchanged.
An erratum to this article is available at http://dx.doi.org/10.1007/s11356-017-8578-4.
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Cicatelli, A., Guarino, F., Baldan, E. et al. Genetic and biochemical characterization of rhizobacterial strains and their potential use in combination with chelants for assisted phytoremediation. Environ Sci Pollut Res 24, 8866–8878 (2017). https://doi.org/10.1007/s11356-016-7982-5
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DOI: https://doi.org/10.1007/s11356-016-7982-5