title: Addition of allochthonous fungi to a historically contaminated soil affects both remediation efficiency and bacterial diversity.
abstract: Botryosphaeria rhodina DABAC P82 and Pleurotus pulmonarius CBS 664.97 were tested for their ability to grow and to degrade aromatic hydrocarbons in an aged contaminated soil. To evaluate the impact of indigenous microflora on the overall process, incubations were performed on both fumigated and nonfumigated soils. Fungal colonization by B. rhodina was unexpectedly lower in the fumigated than in the nonfumigated soil while the growth of P. pulmonarius showed an opposite response. Degradation performances and detoxification by both fungi in the nonfumigated soil were markedly higher than those observed in the fumigated one. Heterotrophic bacterial counts in nonfumigated soil augmented with either B. rhodina or P. pulmonarius were significantly higher than those of the corresponding incubation control (6.7 +/- 0.3 x 10(8) and 8.35 +/- 0.6 x 10(8), respectively, vs 9.2 +/- 0.3 x 10(7)). Bacterial communities of both incubation controls and fungal-augmented soil were compared by numerical analysis of denaturing gradient gel electrophoresis profiles of polymerase chain reaction (PCR)-amplified 16S ribosomal RNA (rRNA) genes and cloning and sequencing of PCR-amplified 16S rRNA genes. Besides increasing overall diversity, fungal augmentation led to considerable qualitative differences with respect to the pristine soil.
authors.affiliation: Dipartimento di Medicina Sperimentale e Scienze Biochimiche, University of Perugia, Perugia, Italy.
authors.forename: Ermanno
authors.initials: E
authors.lastname: Federici
authors.forename: Vanessa
authors.initials: V
authors.lastname: Leonardi
authors.forename: Maria A
authors.initials: MA
authors.lastname: Giubilei
authors.forename: Daniele
authors.initials: D
authors.lastname: Quaratino
authors.forename: Roberta
authors.initials: R
authors.lastname: Spaccapelo
authors.forename: Alessandro
authors.initials: A
authors.lastname: D'Annibale
authors.forename: Maurizio
authors.initials: M
authors.lastname: Petruccioli
mesh_terms: D001203:Ascomycota / Q000254:growth & development / Q000378:metabolism; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000254:growth & development*; D001673:Biodegradation, Environmental; D044822:Biodiversity; D016000:Cluster Analysis; D004591:Electrophoresis, Polyacrylamide Gel; D005658:Fungi / Q000254:growth & development* / Q000378:metabolism; D014644:Genetic Variation; D006841:Hydrocarbons, Aromatic / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology