Phytoextraction actuated by hyperaccumulating or non-hyperaccumulating species could be improved by using a plant-microbe system (Zhuang et al. 2007, Lebeau et al., 2008) thus contributing to novel promising methods for the cleaning-up of metal contaminated soils. Rhizobacteria of the genus Azospirillum have been extensively used for crop phytostimulation thanks to the positive interaction between bacteria and plants at root level (Dobbeleare et al., 2001; Basaglia et al., 2003; Russo et al., 2005; Russo et al., 2008). The implementation of lead phytoextraction in contaminated industrial soils by applying the A. brasilense Sp245 to plants of indigenous species belonging to Mediterranean forestry was the aim of this work. The possible phytoextraction ability was evaluated in Myrtus communis L. and Laurus nobilis L., previously selected between other plant species founded able to grow in the contaminated areas, on the basis of the Pb content (Emission Spectrophotometer Atomic Plasma, ICP-AES), the growing speed and the vegetative habitus. Greenhouse trials were performed for 2 and 9 months, and plants were grown in pot in the presence of two level of Pb (312 and 4345 ppm). Metal accumulation in plants was higher at 9 months than at 2 months and, considering a coppice life cycle with a cut every 3-4 years, the total amount of Pb accumulated could be interesting for a field application. The presence of Sp245 positively affected the total amount of Pb removed by plants either as total biomass produced and as higher specific Pb concentration. Moreover the bioconcentration factor (Pb in plant tissues/Pb in soil) and translocation factor (Pb in leaves and shoots/Pb in roots) were significantly affected by the presence of A. brasilense Sp245, attesting the synergetic effect of plants and microorganism in a rhizoremediation system.

Bioremedation and phytoremedation: Synergism in lead extraction from contamined soils

CINELLI, FABRIZIO;TOFFANIN, ANNITA
2010-01-01

Abstract

Phytoextraction actuated by hyperaccumulating or non-hyperaccumulating species could be improved by using a plant-microbe system (Zhuang et al. 2007, Lebeau et al., 2008) thus contributing to novel promising methods for the cleaning-up of metal contaminated soils. Rhizobacteria of the genus Azospirillum have been extensively used for crop phytostimulation thanks to the positive interaction between bacteria and plants at root level (Dobbeleare et al., 2001; Basaglia et al., 2003; Russo et al., 2005; Russo et al., 2008). The implementation of lead phytoextraction in contaminated industrial soils by applying the A. brasilense Sp245 to plants of indigenous species belonging to Mediterranean forestry was the aim of this work. The possible phytoextraction ability was evaluated in Myrtus communis L. and Laurus nobilis L., previously selected between other plant species founded able to grow in the contaminated areas, on the basis of the Pb content (Emission Spectrophotometer Atomic Plasma, ICP-AES), the growing speed and the vegetative habitus. Greenhouse trials were performed for 2 and 9 months, and plants were grown in pot in the presence of two level of Pb (312 and 4345 ppm). Metal accumulation in plants was higher at 9 months than at 2 months and, considering a coppice life cycle with a cut every 3-4 years, the total amount of Pb accumulated could be interesting for a field application. The presence of Sp245 positively affected the total amount of Pb removed by plants either as total biomass produced and as higher specific Pb concentration. Moreover the bioconcentration factor (Pb in plant tissues/Pb in soil) and translocation factor (Pb in leaves and shoots/Pb in roots) were significantly affected by the presence of A. brasilense Sp245, attesting the synergetic effect of plants and microorganism in a rhizoremediation system.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/140710
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