The impact of cadmium on photosynthesis and secondary metabolites in lichens Parmelia sulcata, Evernia prunastri and Flavoparmelia caperata

Maslać, Ana (2016) The impact of cadmium on photosynthesis and secondary metabolites in lichens Parmelia sulcata, Evernia prunastri and Flavoparmelia caperata. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Lichens are successfully used as air quality bioindicators, due to the fact that various physiological changes in lichens can be caused by air pollution. Since the level of heavy metal cadmium is often increased in polluted air, the objective of this research was to determine the impact of short-term exposure to cadmium (50 mg/L) on photosynthetic apparatus and secondary metabolites in lichens Parmelia sulcata, Evernia prunastri and Flavoparmelia caperata. Chlorophyll fluorescence was used to estimate photosynthetic damage, while detection and quantification of secondary metabolites was determined by high performance liquid chromatography. In all three species, optimum quantum yield and fluorescence decrease ratio did not show differences between cadmium-treated lichens and corresponding controls after first and third day of exposure. On the eight day decreased values were observed, that can indicate damage of photosynthetic apparatus. Lichen substances typical for particular species were detected: salazinic acid and atranorin in P. sulcata; evernic acid, atranorin and chloroatranorin in E. prunastri; and protocetraric acid and usnic acid in F. caperata. In foliose lichens (P. sulcata and F. caperata) a decreased content of medullary depsidones salazinic and protocetraric acid, but increased content of cortical depsides atranorin and dibenzofurane usnic acid was observed in cadmium-treated lichens. In the fruticose lichen (E. prunastri) no significant changes were found in metabolites content. Results show that investigated species are partly resistant to cadmium-exposure and that secondary metabolites could have a role in heavy metal tolerance. However, the tolerance could depend on metabolites chemical structure, lichen growth form and part of the thallus where metabolites are deposited.

Item Type: Thesis (Diploma thesis)
Keywords: cadmium, air pollution, lichens, photosynthesis, secondary metabolites
Supervisor: Tkalec, Mirta
Date: 2016
Number of Pages: 42
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 21 Nov 2016 10:26
Last Modified: 21 Nov 2016 10:26
URI: http://digre.pmf.unizg.hr/id/eprint/5310

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