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Chemical and Physical Mechanisms of Fungal Bioweathering of Rock Phosphate

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
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:
Type of IDID
DOI10.1080/01490451.2020.1863525
Web of Science (WoS)000603896300001
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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