Influence of arbuscular mycorrhizal inoculum sources on phytoremediation efficiency of a historically dioxin/furan contaminated soil - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Influence of arbuscular mycorrhizal inoculum sources on phytoremediation efficiency of a historically dioxin/furan contaminated soil

Résumé

Soil pollution, a difficult environmental problem, has been attracting considerable public attention over the last decades. Several organic persistent pollutants are found in contaminated soils including dioxins/furans (PCDD/F). These contaminants are harmful both for environment and human health (immunotoxicity, neurotoxicity, carcinogenicity). Phytoremediation is one of the emerging depollution methods of contaminated soils due to its suitability. However, the effectiveness of this phytotechnology is still often limited, especially in the case of chlorinated compounds, due to their recalcitrance and phytotoxicity. One way to enhance the efficiency of this phytoremediation could be the input of a biological amendment consisting of arbuscular mycorrhizal fungi (AMF). Therefore, the aim of this study was to compare the effects of two mycorrhizal inoculum sources (indigenous and commercial) in association with alfalfa and tall fescue on the plant growth, the bacterial, fungal, and archaeal communities as well as on the removal of PCDD/F from a historically contaminated soil after 24 weeks of culture in microcosms. Our results showed that both mycorrhizal indigenous and commercial inoculums were able to colonize plant roots, and the growth response depends on the AMF inoculum. Nevertheless, the improvement of root dry weight in inoculated alfalfa with indigenous inoculum and in inoculated tall fescue with commercial inoculum was clearly correlated with the highest mycorrhizal colonization of the roots in both plant species. The highest shoot dry weight was obtained in inoculated alfalfa and tall fescue with the commercial inoculum. AMF inoculation differently affected the number of bacterial and archaeal OTUs and bacterial diversity, with elevated bacterial and archaeal OTUs and bacterial diversity observed with indigenous inoculum. Mycorrhizal inoculation increases the abundance of bacterial OTUs (in particular with indigenous inoculum) and microbial richness but it does not improve PCDD/F dissipation. Vegetation enhanced the dissipation of soil PCDD/F by stimulating general microbial activities in the soil measured as dehydrogenase and fluorescein diacetate hydrolase activities, as well as by enhancing the growth of specific microbial communities potentially involved in the degradation of PCDD/F such as Gammaprotebacteria and Planctomycetia class. Our findings showed that (1) vegetation is an appropriate mean to enhance the PCDD/F dissipation in soil. (2) AMF inoculum sources influence microbial communities’ structures of historically PCDD/F-contaminated soil but not the pollutant dissipation rate.
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Dates et versions

hal-04368407 , version 1 (31-12-2023)

Identifiants

  • HAL Id : hal-04368407 , version 1

Citer

Hacène Meglouli, Maryline Magnin-Robert, Benoit Tisserant, Mohamed Hijri, Joël Fontaine, et al.. Influence of arbuscular mycorrhizal inoculum sources on phytoremediation efficiency of a historically dioxin/furan contaminated soil. 15th International Phytotechnology Conference, Oct 2018, Novi Sad, Serbia. ⟨hal-04368407⟩
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