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Université de Neuchâtel

Calcitic nanofibres in soils and caves : a putative fungal contribution to carbonatogenesis

Bindschedler, Saskia ; Millière, L ; Cailleau, G ; Job, Daniel ; Verrechia, Eric P

In: Geological Society, London, Special Publications, 2010, vol. 336, no. 1, p. 225-238

The origin of soil mineralized nanofibres remains controversial. It is attributed to either biogenic factors or physicochemical processes. Scanning electron microscope and transmission electron microscope observations show that nanofibres could originate from the breakdown of fungal hyphae, especially its cell wall. It is hypothesized that during the decay of organic matter, cell wall...

Université de Neuchâtel

Gains of Bacterial Flagellar Motility in a Fungal World

Pion, Martin ; Bshary, Redouan ; Bindschedler, Saskia ; Filippidou, Sevasti ; Wick, Lukas Y ; Job, Daniel ; Junier, Pilar

In: Applied and Environmental Microbiology, 2013, vol. 79, no. 22, p. 6862-6867

The maintenance of energetically costly flagella by bacteria in non-water-saturated media, such as soil, still presents an evolutionary conundrum. Potential explanations have focused on rare flooding events allowing dispersal. Such scenarios, however, overlook bacterial dispersal along mycelia as a possible transport mechanism in soils. The hypothesis tested in this study is that dispersal along...

Université de Neuchâtel

Bacterial farming by the fungus Morchella crassipes

Pion, Martin ; Spangenberg, Jorge E ; Simon, Anaele ; Bindschedler, Saskia ; Flury, Coralie ; Chatelain, Auriel ; Bshary, Redouan ; Job, Daniel ; Junier, Pilar

In: Proceedings of the Royal Society B: Biological Sciences, 2013, vol. 280, no. 1173, p. 20132242

The interactions between bacteria and fungi, the main actors of the soil microbiome, remain poorly studied. Here, we show that the saprotrophic and ectomycorrhizal soil fungus Morchella crassipes acts as a bacterial farmer of Pseudomonas putida, which serves as a model soil bacterium. Farming by M. crassipes consists of bacterial dispersal, bacterial rearing with fungal...

Université de Neuchâtel

Protection of metal artifacts with the formation of metal–oxalates complexes by Beauveria bassiana

Joseph, Edith ; Cario, Sylvie ; Simon, Anaële ; Wörle, Marie ; Mazzeo, Rocco ; Junier, Pilar ; Job, Daniel

In: Frontiers in microbiology, 2011, vol. 2, no. 270, p. 1-8

Several fungi present high tolerance to toxic metals and some are able to transform metals into metal-oxalate complexes. In this study, the ability of Beauveria bassiana to produce copper oxalates was evaluated. Growth performance was tested on various copper-containing media. B. bassiana proved highly resistant to copper, tolerating concentrations of up to 20 g L-1,...

Université de Neuchâtel

Fungi, bacteria and soil pH : the oxalate–carbonate pathway as a model for metabolic interaction

Martin, Gaëtan ; Guggiari, Matteo ; Bravo, Daniel ; Zopfi, Jakob ; Cailleau, Guillaume ; Aragno, Michel ; Job, Daniel ; Verrecchia, Eric ; Junier, Pilar

In: Environmental Microbiology, 2012, vol. 14, no. 11, p. 2960-2970

The oxalate–carbonate pathway involves the oxidation of calcium oxalate to low-magnesium calcite and represents a potential long-term terrestrial sink for atmospheric CO2. In this pathway, bacterial oxalate degradation is associated with a strong local alkalinization and subsequent carbonate precipitation. In order to test whether this process occurs in soil, the role of bacteria,...

Université de Neuchâtel

Experimental calcium-oxalate crystal production and dissolution by selected wood-rot fungi

Guggiari, Matteo ; Bloque, Raphael ; Aragno, Michel ; Verrecchia, Eric ; Job, Daniel ; Junier, Pilar

In: International Biodeterioration & Biodegradation, 2011, vol. 65, no. 6, p. 803-809

Twenty-six species of white-rotting Agaricomycotina fungi (Basidiomycota) were screened for their ability to produce calcium-oxalate (CaOx) crystals in vitro. Most were able to produce CaOx crystals in malt agar medium in the absence of additional calcium. In the same medium enriched with Ca2+, all the species produced CaOx crystals (weddellite or whewellite). Hyphae of...

Université de Neuchâtel

Use of the frc gene as a molecular marker to characterize oxalate-oxidizing bacterial abundance and diversity structure in soil

Khammar, Nadia ; Martin, Gaëtan ; Ferro, Katia ; Job, Daniel ; Aragno, Michel ; Verrecchia, Eric

In: Journal of Microbiological Methods, 2009, vol. 76, no. 2, p. 120-127

Oxalate catabolism, which can have both medical and environmental implications, is performed by phylogenetically diverse bacteria. The formyl-CoA-transferase gene was chosen as a molecular marker of the oxalotrophic function. Degenerated primers were deduced from an alignment of frc gene sequences available in databases. The specificity of primers was tested on a variety of...