Cell wall immobilisation and antioxidant status of Xanthoria parietina thalli exposed to cadmium

Functional Plant Biology : FPB
L Sanità di ToppiMaurizio Badiani

Abstract

Total and cell wall-bound cadmium and the major antioxidants were measured in thalli of the lichen Xanthoria parietina (L.) Th. Fr. exposed to two Cd concentrations, namely 4.5 or 9.0 μm, in liquid medium during exposure periods of either 24 or 48 h. Total Cd in the thalli was within the range of previous field measurements and was proportional to the exposure concentration, but less than proportional with respect to exposure duration. More than half of the total Cd was immobilised by the cell wall. The adopted conditions of Cd stress caused: (i) no changes in dry weight and protein concentration; (ii) an increase in the level of ascorbic acid and a decrease in that of reduced glutathione, as well as an increase in guaiacol peroxidase activity; (iii) no changes or moderate decreases in the activities of superoxide dismutase, catalase, dehydroascorbate-, NADPH-dependent glutathione disulfide-, and monodehydroascorbate reductases and of ascorbate peroxidase; (iv) an increase of the level of thiobarbituric acid-reactive substances, assumed to reflect malondialdehyde formation arising from membrane lipid peroxidation. Thus, X. parietina might withstand realistic levels of Cd stress by: (1) intercepting the heavy metal at cell wall ...Continue Reading

References

Apr 1, 1968·Archives of Biochemistry and Biophysics·R L Heath, L Packer
Sep 4, 1999·The Science of the Total Environment·C BranquinhoA Soares
Nov 18, 2000·The Journal of Biological Chemistry·K VidoJ Labarre
Oct 18, 2001·Journal of Experimental Botany·L M SandalioL A del Río
Jul 2, 2003·The Journal of General and Applied Microbiology·Andrea GuelfiSilvia M G Molina
Dec 17, 2003·Archives of Environmental Contamination and Toxicology·J CollénP Colepicolo
May 1, 2004·Functional Plant Biology : FPB·Luigi Sanità di ToppiMaurizio Badiani

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Citations

Nov 26, 2009·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Tanja MrakLuigi Sanità di Toppi
Jun 1, 2007·Functional Plant Biology : FPB·Rui A Gomes-JuniorRicardo A Azevedo

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Methods Mentioned

BETA
AsA
flame atomic absorption spectroscopy
protein assay

Software Mentioned

Systat

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