Abstract
With the aim of improving the phytoextraction rate of cesium (Cs), the effect of Pseudomonas fluorescens ATCC 17400 and its siderophore pyoverdine (PVD) on the uptake of Cs by red clover was studied in soil pots. This work also provides a mechanistic understanding of the Cs-bacteria (or PVD)-illite-plant interactions by using a simplified experimental design, i.e., hydroponics with either Cs in solution or Cs-spiked illite in suspension. For soil spiked with 11.2 mmol kg−1 (1480 mg kg−1) of Cs, 0.43% of total Cs was taken up by red clover in 12 days (119 μmol g−1 (16 mg g−1) of Cs dry matter in roots and 40 μmol g−1 (5 mg g−1) in shoots). In hydroponics with Cs in solution (0.1 mmol L−1 or 13 mg L−1), 75% of Cs was taken up vs. only 0.86% with Cs-spiked illite suspension. P. fluorescens and PVD did not increase Cs concentrations in aboveground parts and roots of red clover and even decreased them. The damaging effect of PVD on red clover growth was demonstrated with the biomass yielding 66% of the control in soil pots (and 100% mortality after 12 days of exposition) and only 56% in hydroponics (78% with illite in suspension). Nonetheless, PVD and, to a lesser extent, P. fluorescens increased the translocation factor up to a factor of 2.8. This study clearly showed a direct damaging effect of PVD and to a lower extent the retention of Cs by biofilm covering both the roots and illite, both resulting in the lower phytoextraction efficiency.
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Acknowledgments
The authors are most grateful to Dr. Christophe Tournassat (with BRGM, France) for supplying the illite powder.
Funding
This work was financed by France’s Pays de la Loire Regional Council (under the RS2E-OSUNA Project).
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Hazotte, A., Péron, O., Gaudin, P. et al. Effect of Pseudomonas fluorescens and pyoverdine on the phytoextraction of cesium by red clover in soil pots and hydroponics. Environ Sci Pollut Res 25, 20680–20690 (2018). https://doi.org/10.1007/s11356-018-1974-6
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DOI: https://doi.org/10.1007/s11356-018-1974-6