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Exploring the metal phytoremediation potential of three Populus alba L. clones using an in vitro screening

Abstract

Purpose

This work was planned for providing a useful screening tool for the selection of Populus alba clones suitable for phytoremediation techniques. To this aim, we investigated variation in arsenic, cadmium, copper, and zinc tolerance, accumulation and translocation in three poplar clones through an in vitro screening. Poplars have been widely proposed for phytoremediation, as they are adaptable to grow on contaminated areas and able to accumulate metals. The investigation of possible differences among poplar clones in metal tolerance and accumulation deserves to be deeply studied and exploited for the selection of the more suitable tool for phytoremediation purposes.

Methods

In vitro multiplied microshoots of a commercial and two autochthonous P. alba clones were subcultured on hormone-free WPM medium for 1 month and then transferred for 2 weeks onto media containing different concentrations of the metals investigated. At the end of the treatments, plantlets were sampled, weighed, and mineralised by wet ashing. Metal concentrations were determined by ICP-OES.

Results

For the metal concentration used in the experiments, our clones of P. alba showed variation in metal tolerance, metal accumulation and content. The fast-growing commercial clone, even if rarely showing the highest plant metal concentration, displayed the highest metal content, suggesting biomass production as the key factor in evaluating the phytoextraction capacity of P. alba clones for the metals studied.

Conclusions

Data demonstrated that in vitro screening of cuttings represents a valuable way of assessing the ability of different poplar clones to take up, tolerate and survive metal stress.

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Acknowledgements

This study was funded by the CNR (Istituto di Genetica Vegetale) and the University of Firenze (Fondi di Ateneo 2007–2008).

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Correspondence to Maurizio Capuana.

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Responsible editor: Elena Maestri

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Di Lonardo, S., Capuana, M., Arnetoli, M. et al. Exploring the metal phytoremediation potential of three Populus alba L. clones using an in vitro screening. Environ Sci Pollut Res 18, 82–90 (2011). https://doi.org/10.1007/s11356-010-0354-7

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  • DOI: https://doi.org/10.1007/s11356-010-0354-7

Keywords

  • Poplar
  • Metals
  • Tolerance and accumulation variability
  • Clonal selection