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Les hydrocarbures aromatiques polycycliques dans la rhizosphère et la mycorhizosphère des plantes : étude de la toxicité et du devenir des polluants

Abstract : Several studies showed the ability of plant rhizosphere to enhance the dissipation of polyaromatic hydrocarbons (PAH) however the fate of PAH and the mechanisms involved are not clearly elucidated. The aims of this work were to investigate the influence of PAHs on mycorrhizal colonization and on plant growth, the fate of PAB in the rhizosphere including adsorption to, absorption by plant tissues, and biodegradation, and the involvement of arbuscular mycorrhizal (AM) fungi. Plants, inoculated or not with AM fungi, were grown in an agricultural soil contaminated with an industrial soil or with concentrations of anthracene or of a mixture of 8 PAHs. Roots and AM fungi were also studied separately using a compartment system. Plant biomass and plant mycorhization were recorded. PAH concentrations in soils, at the beginning and at the end of the experiments, PAH adsorbed on roots and accumulated in roots and shoots were quantified. PAH did not affect the mycorhization which enhanced growth and survival of plants. The major part of PAH extracted from roots was adsorbed and seemed to decrease with the presence of AM fungi. PAH extracted from shoots were negligible. AM fungi contribute to PAB degradation in the rhizosphere of ryegrass, but the biodegradation varies with the fungus and the experimental conditions. The presence of ryegrass enhanced the dissipation of the 8 PAH used and the development of PAH degraders micruflora. Some metabolites such as quinones were identified, suggesting a peroxydase activity. This activity has been detected in roots and AM fungi compartments of ryegrass and clover. These results suggest that the rhizosphere activity could be used for the remediation of contaminated soils.
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http://docnum.univ-lorraine.fr/prive/SCD_T_1999_0027_BINET.pdf
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https://hal.univ-lorraine.fr/tel-01747058
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Submitted on : Thursday, March 29, 2018 - 10:50:17 AM
Last modification on : Thursday, January 14, 2021 - 1:55:09 PM

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  • HAL Id : tel-01747058, version 1

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Philippe Binet. Les hydrocarbures aromatiques polycycliques dans la rhizosphère et la mycorhizosphère des plantes : étude de la toxicité et du devenir des polluants. Agronomie. Université Henri Poincaré - Nancy 1, 1999. Français. ⟨NNT : 1999NAN10027⟩. ⟨tel-01747058⟩

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