Geomycology investigates the impact of fungi on geological processes, including the alteration and weathering of rocks and minerals, mediated both by biomechanical and by biochemical activities. Several functional groups of fungi are involved in mineral bioweathering, including saprotrophic and mycorrhizal fungi. Serpentine sites provide interesting environmental cases for geomycology, because they are naturally enriched in heavy metals and can bear asbestos-rich rocks. An otherwise uncommon species, Verticillium leptobactrum, was found to be abundant in several serpentine sites in the Western Alps. V. leptobactrum and other fungal strains were shown to be able to extract different amounts of iron and magnesium from asbestos in vitro. The amount of iron mobilized from the fibres depended on the fungal activity but also on the physical characteristics of the mineral. Iron is of particular importance because one of the reactions determining asbestos toxicity is the iron-catalyzed generation of free radicals leading to biomolecules oxidation. Asbestos fibres modified in vitro by fungi were less chemically reactive and lost their oxidative activity against DNA.

Fungal weathering and implications in the solubilization of metals from soil and from asbestos fibres

DAGHINO, Stefania;MARTINO, ELENA;PEROTTO, Silvia
2010

Abstract

Geomycology investigates the impact of fungi on geological processes, including the alteration and weathering of rocks and minerals, mediated both by biomechanical and by biochemical activities. Several functional groups of fungi are involved in mineral bioweathering, including saprotrophic and mycorrhizal fungi. Serpentine sites provide interesting environmental cases for geomycology, because they are naturally enriched in heavy metals and can bear asbestos-rich rocks. An otherwise uncommon species, Verticillium leptobactrum, was found to be abundant in several serpentine sites in the Western Alps. V. leptobactrum and other fungal strains were shown to be able to extract different amounts of iron and magnesium from asbestos in vitro. The amount of iron mobilized from the fibres depended on the fungal activity but also on the physical characteristics of the mineral. Iron is of particular importance because one of the reactions determining asbestos toxicity is the iron-catalyzed generation of free radicals leading to biomolecules oxidation. Asbestos fibres modified in vitro by fungi were less chemically reactive and lost their oxidative activity against DNA.
Current Research, Technology and Education Topics in Applied Microbiology and Microbial Biotechnology
Formatex Research Center
Vol. 1
329
338
9788461461943
http://www.formatex.org/microbiology2/
serpentine; fungi; asbestos; metals; bioweathering; iron; magnesium.
S. Daghino; E. Martino; S. Perotto
File in questo prodotto:
File Dimensione Formato  
26_Daghino et al_2010.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 2.85 MB
Formato Adobe PDF
2.85 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/76588
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact