Mendes, Gilberto de Oliveira and Bahri-Esfahani, Jaleh and Csetenyi, Laszlo and Hillier, Stephen and George, Timothy S. and Gadd, Geoffrey Michael
(2021).
Chemical and Physical Mechanisms of Fungal Bioweathering of Rock Phosphate.
Geomicrobiology Journal. 38
, 384-394
[Research article]
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Abstract
This research has investigated fungal transformations of rock phosphate (RP) by geoactive fungi, with particular emphasis on Aspergillus niger. Direct hyphal interaction with RP particles induced morphological and mineralogical changes, as revealed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The formation of the oxalate mineral calcium oxalate monohydrate (whewellite, CaC2O4 center dot H2O) on RP surfaces showed that mycogenic oxalic acid was driving the chemical dissolution of apatite, with consequent phosphate release and secondary mineral formation. This was supported by abiotic testing of common fungal excreted organic acids which confirmed that oxalic acid was the only effective RP transforming agent and therefore responsible for the morphological and mineralogical changes observed in RP when exposed to fungal colonization. Cryogenic SEM provided evidence of fungal penetration and tunneling through RP particles demonstrating that physical interactions are also important for RP bioweathering, as well as biochemical mechanisms. These findings emphasize the important role of fungi in P cycling, with active participation in the transformation of mineral phosphates through physicochemical mechanisms and secondary oxalate biomineral formation.
Authors/Creators: | Mendes, Gilberto de Oliveira and Bahri-Esfahani, Jaleh and Csetenyi, Laszlo and Hillier, Stephen and George, Timothy S. and Gadd, Geoffrey Michael | ||||||
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Title: | Chemical and Physical Mechanisms of Fungal Bioweathering of Rock Phosphate | ||||||
Series Name/Journal: | Geomicrobiology Journal | ||||||
Year of publishing : | 2021 | ||||||
Volume: | 38 | ||||||
Page range: | 384-394 | ||||||
Number of Pages: | 11 | ||||||
Publisher: | TAYLOR AND FRANCIS INC | ||||||
ISSN: | 0149-0451 | ||||||
Language: | English | ||||||
Publication Type: | Research article | ||||||
Article category: | Scientific peer reviewed | ||||||
Version: | Published version | ||||||
Copyright: | Creative Commons: Attribution 4.0 | ||||||
Full Text Status: | Public | ||||||
Subjects: | (A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geosciences, Multidisciplinary | ||||||
Keywords: | Aspergillus niger, calcium oxalate, fungi, oxalic acid, rock phosphate, whewellite | ||||||
URN:NBN: | urn:nbn:se:slu:epsilon-p-110098 | ||||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-110098 | ||||||
Additional ID: |
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ID Code: | 24370 | ||||||
Faculty: | NJ - Fakulteten för naturresurser och jordbruksvetenskap | ||||||
Department: | (NL, NJ) > Dept. of Soil and Environment (S) > Dept. of Soil and Environment | ||||||
Deposited By: | SLUpub Connector | ||||||
Deposited On: | 02 Jun 2021 12:27 | ||||||
Metadata Last Modified: | 02 Jun 2021 12:31 |
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