title: Comparative assessment of fungal augmentation treatments of a fine-textured and historically oil-contaminated soil.
abstract: The removal of aged hydrophobic contaminants from fine-textured soils is a challenging issue in remediation. The objective of this study was to compare the efficacy of augmentation treatments to that of biostimulation in terms of total aliphatic hydrocarbon (TAH) and toxicity removal from a historically contaminated clay soil and to assess their impact on the resident microbial community. To this aim, Pleurotus ostreatus, Botryosphaeria rhodina and a combination of both were used as the inoculants while the addition of a sterilized lignocellulose mixture to soil (1:5, w/w) was used as a biostimulation approach. As opposed to the non-amended control soil, where no changes in TAH concentration and residual toxicity were observed after 60days, the activation of specialized bacteria was found in the biostimulated microcosms resulting in significant TAH removal (79.8%). The bacterial community structure in B. rhodina-augmented microcosms did not differ from the biostimulated microcosms due to the inability of the fungus to be retained within the resident microbiota. Best TAH removals were observed in microcosms inoculated with P. ostreatus alone (Po) and in binary consortium with B. rhodina (BC) (86.8 and 88.2%, respectively). In these microcosms, contaminant degradation exceeded their bioavailability thresholds determined by sequential supercritical CO2 extraction. Illumina metabarcoding of 16S rRNA gene showed that the augmentation with Po and BC led to lower relative abundances of Gram(+) taxa, Actinobacteria in particular, than those in biostimulated microcosms. Best detoxification, with respect to the non-amended incubation control, was found in Po microcosms where a drop in collembola mortality (from 90 to 22%) occurred. At the end of incubation, in both Po and BC, the relative abundances of P. ostreatus sequences were higher than 60% thus showing the suitability of this fungus in bioaugmentation-based remediation applications.
authors.affiliation: Institute for Environmental studies, Faculty of Science, Charles University, Prague, Czech Republic; Laboratory of Environmental Biotechnology, Institute of Microbiology of the Czech Academy of Sciences, Praha, Czech Republic; Department for Innovation in Biological, Agro-Food, and Forest systems (DIBAF), University of Tuscia, Viterbo, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Covino
authors.affiliation: Laboratory of Environmental Biotechnology, Institute of Microbiology of the Czech Academy of Sciences, Praha, Czech Republic.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Stella
authors.affiliation: Department for Innovation in Biological, Agro-Food, and Forest systems (DIBAF), University of Tuscia, Viterbo, Italy. Electronic address: danib@unitus.it.
authors.forename: Alessandro
authors.initials: A
authors.lastname: D'Annibale
authors.affiliation: Laboratory of Environmental Microbiology, Institute of Microbiology of the Czech Academy of Sciences, Praha, Czech Republic.
authors.forename: Salvador
authors.initials: S
authors.lastname: Lladó
authors.affiliation: Laboratory of Environmental Microbiology, Institute of Microbiology of the Czech Academy of Sciences, Praha, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Baldrian
authors.affiliation: Institute for Environmental studies, Faculty of Science, Charles University, Prague, Czech Republic; Laboratory of Environmental Biotechnology, Institute of Microbiology of the Czech Academy of Sciences, Praha, Czech Republic.
authors.forename: Monika
authors.initials: M
authors.lastname: Čvančarová
authors.affiliation: Institute for Environmental studies, Faculty of Science, Charles University, Prague, Czech Republic; Laboratory of Environmental Biotechnology, Institute of Microbiology of the Czech Academy of Sciences, Praha, Czech Republic.
authors.forename: Tomas
authors.initials: T
authors.lastname: Cajthaml
authors.affiliation: Department for Innovation in Biological, Agro-Food, and Forest systems (DIBAF), University of Tuscia, Viterbo, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Petruccioli
mesh_terms: D001203:Ascomycota / Q000378:metabolism*; D001673:Biodegradation, Environmental; D001682:Biological Availability; D059014:High-Throughput Nucleotide Sequencing; D006838:Hydrocarbons / Q000378:metabolism*; D007558:Italy; D020076:Pleurotus / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*
chemical_list: D006838:Hydrocarbons; D012989:Soil Pollutants
keywords: Bioremediation; Contaminant bioavailability; High-throughput sequencing; Microbial community; Oil-contaminated soil; Pleurotus ostreatus