Manganese translocation and concentration on Quercus cerris decomposing leaf and wood litter by an ascomycetous fungus: an active process with ecosystem consequences?

TitleManganese translocation and concentration on Quercus cerris decomposing leaf and wood litter by an ascomycetous fungus: an active process with ecosystem consequences?
Publication TypeJournal Article
Year of Publication2018
AuthorsPinzari F., Cuadros J., Migliore M., Napoli R., Najorka J.
JournalFEMS Microbiology Ecology
Volume94
Pagination16
Date PublishedAug
Type of ArticleArticle
ISBN Number0168-6496
Accession NumberWOS:000441198800006
KeywordsACCUMULATION, Bacteria, bioprecipitation, Fungi, leaf litter, manganese, MECHANISMS, metal translocation, Microbiology, mn concentrations, mn(ii) oxidation, oxides, peroxidase, precipitation, SEM, soil, solubilization, XRD
Abstract

Decomposing fungi translocate manganese (Mn) as demonstrated by the fact that Mn has been found to accumulate on decomposing leaves associated with individual fungal hyphae forming insoluble Mn(III,IV) oxides that remain concentrated in diffuse patches. Here, we studied Mn translocation and precipitation by the saprophytic fungus Alternaria sp. strain FBL507 both on naturally decomposing oak leaves and in vitro experiments. Manganese was translocated and precipitated in beads and encrustations along the fungal hyphae. The combination of X-ray diffraction and scanning electron microscopy-energy dispersive X-ray spectroscopy chemical data showed that the precipitates found on leaves were rhodochrosite (MnCO3), birnessite ([Na, Ca, K]Mn2O4 x 1.5H(2)O) and possibly Mn oxalate. The precipitates on wood were an amorphous Mn-O compound, probably MnO. Thus, Mn oxidation state in the precipitates spanned from +2 to +4, with +3 and +4 only in the birnessite on the leaves. In vitro experiments showed that Mn precipitates formed in living hyphae, suggesting the possibility that Mn precipitation is actively produced by the fungus. Such a possibility raises interesting questions regarding the role of readily available Mn in the activity of saprophytic fungi and other soil microorganisms, such as would result in a large involvement of Mn in the cycles of the major nutrient elements.

Short TitleFEMS Microbiol. Ecol.FEMS Microbiol. Ecol.
Alternate JournalFEMS Microbiol. Ecol.
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Cited Reference Count: 65
Pinzari, Flavia Cuadros, Javier Migliore, Melania Napoli, Rosario Najorka, Jens
Pinzari, Flavia/S-1790-2018
Pinzari, Flavia/0000-0002-1083-8734; Napoli, Rosario/0000-0002-2780-8734

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