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Cadmium-induced formation of sulphide and cadmium sulphide particles in the aquatic hyphomycete Heliscus lugdunensis.
- Source :
-
Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) [J Trace Elem Med Biol] 2015; Vol. 31, pp. 92-7. Date of Electronic Publication: 2015 Apr 04. - Publication Year :
- 2015
-
Abstract
- Freshwater fungi which can survive under metal exposure receive increasing scientific attention. Enhanced synthesis of sulphide and glutathione but no phytochelatin synthesis in response to cadmium (up to 80 μM Cd(2+) in the medium) was measured in the aquatic hyphomycete Heliscus lugdunensis. Up to 25 μmol g(-1) dry mass the fungus formed sulphide in an exponentially Cd(2+)-concentration-dependent manner. Using light microscopy, precipitates were observed outside of the hyphae which could be determined as amorphous particles by X-ray diffraction (XRD). Energy dispersive X-ray spectroscopy (EDS) analysis indicated that these particles were mainly composed of Cd and S with an atomic ratio of 1:1, but some elements of the culture medium such as P and Cl were also present. Fungal cells exposed to Cd(2+) accumulated 12-28 μmol metal g(-1) dry mass over a period of 7-28 days. The results may indicate that sulphide could sequester excess Cd(2+) under oxygen deprived conditions and thereby reduce its toxicity via an additional avoidance mechanism of this fungus.<br /> (Copyright © 2015 Elsevier GmbH. All rights reserved.)
- Subjects :
- Absorption, Physiological
Adsorption
Aquatic Organisms growth & development
Aquatic Organisms metabolism
Aquatic Organisms ultrastructure
Biodegradation, Environmental
Cadmium chemistry
Cadmium metabolism
Cadmium Compounds chemistry
Chemical Precipitation
Glutathione metabolism
Hyphae drug effects
Hyphae growth & development
Hyphae metabolism
Hyphae ultrastructure
Hypocreales growth & development
Hypocreales metabolism
Hypocreales ultrastructure
Inactivation, Metabolic
Microscopy, Electron, Scanning
Mitosporic Fungi drug effects
Mitosporic Fungi isolation & purification
Mitosporic Fungi metabolism
Nova Scotia
Particle Size
Rivers
Spectrometry, X-Ray Emission
Sulfides chemistry
Toxicokinetics
Water Pollutants, Chemical metabolism
X-Ray Diffraction
Aquatic Organisms drug effects
Cadmium toxicity
Cadmium Compounds metabolism
Hypocreales drug effects
Sulfides metabolism
Water Pollutants, Chemical toxicity
Subjects
Details
- Language :
- English
- ISSN :
- 1878-3252
- Volume :
- 31
- Database :
- MEDLINE
- Journal :
- Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS)
- Publication Type :
- Academic Journal
- Accession number :
- 26004898
- Full Text :
- https://doi.org/10.1016/j.jtemb.2015.03.006