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Mg isotope fractionation during uptake by a rock-inhabiting, model microcolonial fungus Knufia petricola at acidic and neutral pH

  • The model rock-inhabiting microcolonial fungus Knufia petricola fractionates stable Mg isotopes in a time and pH-dependent manner. During growth, the increase of 26Mg/24Mg in the fungal cells relative to the growth media amounted to 0.65 ± 0.14‰at pH 6 and 1.11 ± 0.35‰at pH 3. We suggest a constant equilibrium fractionation factor during incorporation of Mg into ribosomes and ATP as a cause of enrichment of 26Mg in the cells. We suggest too that the proton gradient across the cell wall and cytoplasmic Membrane controls Mg2+ transport into the fungal cell. As the strength of this gradient is a function of extracellular solution pH, the pHdependence on Mg isotope fractionation is thus due to differences in fungal cell mass fluxes. Through a mass balance model we show that Mg uptake into the fungal cell is not associated with a unique Mg isotope fractionation factor. This Mg isotope fractionation dependence on pH might also be observed in any organism with cells that follow similar MgThe model rock-inhabiting microcolonial fungus Knufia petricola fractionates stable Mg isotopes in a time and pH-dependent manner. During growth, the increase of 26Mg/24Mg in the fungal cells relative to the growth media amounted to 0.65 ± 0.14‰at pH 6 and 1.11 ± 0.35‰at pH 3. We suggest a constant equilibrium fractionation factor during incorporation of Mg into ribosomes and ATP as a cause of enrichment of 26Mg in the cells. We suggest too that the proton gradient across the cell wall and cytoplasmic Membrane controls Mg2+ transport into the fungal cell. As the strength of this gradient is a function of extracellular solution pH, the pHdependence on Mg isotope fractionation is thus due to differences in fungal cell mass fluxes. Through a mass balance model we show that Mg uptake into the fungal cell is not associated with a unique Mg isotope fractionation factor. This Mg isotope fractionation dependence on pH might also be observed in any organism with cells that follow similar Mg uptake and metabolic pathways and serves to reveal Mg cycling in ecosystems.zeige mehrzeige weniger

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Metadaten
Autoren/innen:Pokharel Rasesh, Ruben Gerrits, Jan A. Schuessler, Geerke H. Floor, Anna Gorbushina, Friedhelm von Blanckenburg
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Environmental Science and Technology
Jahr der Erstveröffentlichung:2017
Organisationseinheit der BAM:4 Material und Umwelt
4 Material und Umwelt / 4.0 Abteilungsleitung und andere
Herausgeber (Institution):American Chemical Society
Verlag:ACS Publications
Verlagsort:USA
Jahrgang/Band:51
Ausgabe/Heft:17
Erste Seite:9691
Letzte Seite:9699
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Fungus; Isotope fractionation; Magnesium
Themenfelder/Aktivitätsfelder der BAM:Umwelt
DOI:https://doi.org/10.1021/acs.est.7b01798
URL:http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=WOS:000410255800030
ISSN:0013-936X
ISSN:1520-5851
Verfügbarkeit des Volltexts:Volltext-PDF im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:21.11.2017
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:21.11.2017