Abstract
The urease-positive fungi Pestalotiopsis sp. and Myrothecium gramineum, isolated from calcareous soil, were examined for their properties of CaCO3 and SrCO3 biomineralization. After incubation in media amended with urea and CaCl2 and/or SrCl2, calcite (CaCO3), strontianite (SrCO3), vaterite in different forms [CaCO3, (CaxSr1-x)CO3] and olekminskite [Sr(Sr,Ca)(CO3)2] were precipitated, and fungal 'footprints' were observed on mineral surfaces. The amorphous precipitate mediated by Pestalotiopsis sp. grown with urea and equivalent concentrations of CaCl2 and SrCl2 was identified as hydrated Ca and Sr carbonates by Fourier transform infrared spectroscopy. Liquid media experiments showed M.gramineum possessed the highest Sr2+ removal ability, and ∼49% of supplied Sr2+ was removed from solution when grown in media amended with urea and 50mM SrCl2. Furthermore, this organism could also precipitate 56% of the available Ca2+ and 28% of the Sr2+ in the form of CaCO3, SrCO3 and (CaxSr1-x)CO3 when incubated in urea-amended media and equivalent CaCl2 and SrCl2 concentrations. This is the first report of biomineralization of olekminskite and coprecipitation of Sr into vaterite mediated by fungi. These findings suggest that urease-positive fungi could play an important role in the environmental fate, bioremediation or biorecovery of Sr or other metals and radionuclides that form insoluble carbonates.
Original language | English |
---|---|
Pages (from-to) | 3082-3097 |
Number of pages | 16 |
Journal | Environmental Microbiology |
Volume | 17 |
Issue number | 8 |
Early online date | 30 Jul 2015 |
DOIs | |
Publication status | Published - Aug 2015 |
Bibliographical note
AcknowledgementsThe authors gratefully acknowledge the help of Martin Kierans (Central Imaging Facility, College of Life Sciences, University of Dundee, UK) and Dr. Yongchang Fan (Division of Physics, University of Dundee, UK) for assistance with scanning electron microscopy, and Mrs Sylvia Williamson (School of Chemistry, University of St Andrews, UK) and Dr. Aida Fuente Cuesta (School of Chemistry, University of St Andrews, UK) for assistance with Fourier transform infrared spectrometry. We also acknowledge financial support from the China Scholarship Council through a PhD scholarship to Q.L. (No. 201206120066). G.M.G. gratefully acknowledges an award under the 1000 Talents Plan with the Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China.
Keywords
- Fungi
- Calcareous soil
Fingerprint
Dive into the research topics of 'CaCO3 and SrCO3 bioprecipitation by fungi isolated from calcareous soil'. Together they form a unique fingerprint.Profiles
-
Graeme Paton
- Biological Sciences, Aberdeen Centre For Environmental Sustainability - Head of School of Biological Sciences, Chair in Biological Sciences
- Engineering, National Decommissioning Centre
- Centre for Energy Transition
- Marine Alliance for Science and Technology for Scotland (MASTS)
Person: Academic