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Can Parietin Transfer Energy Radiatively to Photosynthetic Pigments?
- Source :
- RIUR. Repositorio Institucional de la Universidad de La Rioja, instname, Molecules, Vol 23, Iss 7, p 1741 (2018), Addi. Archivo Digital para la Docencia y la Investigación, Molecules : A Journal of Synthetic Chemistry and Natural Product Chemistry
- Publication Year :
- 2018
-
Abstract
- The main role of lichen anthraquinones is in protection against biotic and abiotic stresses, such as UV radiation. These compounds are frequently deposited as crystals outside the fungal hyphae and most of them emit visible fluorescence when excited by UV. We wondered whether the conversion of UV into visible fluorescence might be photosynthetically used by the photobiont, thereby converting UV into useful energy. To address this question, thalli of Xanthoria parietina were used as a model system. In this species the anthraquinone parietin accumulates in the outer upper cortex, conferring the species its characteristic yellow-orange colouration. In ethanol, parietin absorbed strongly in the blue and UV-B and emitted fluorescence in the range 480-540 nm, which partially matches with the absorption spectra of photosynthetic pigments. In intact thalli, it was determined by confocal microscopy that fluorescence emission spectra shifted 90 nm towards longer wavelengths. Then, to study energy transfer from parietin, we compared the response to UV of untreated and parietin-free thalli (removed with acetone). A chlorophyll fluorescence kinetic assessment provided evidence of UV-induced electron transport, though independently of the presence of parietin. Thus, a role for anthraquinones in energy harvesting is not supported for X. parietina under presented experimental conditions. This research was funded by the Basque Government, grant number [UPV/EHU-GV IT-1018-16], and by the Spanish Ministry of Economy and Competitiveness (MINECO) and the European Research and Development Foundation (FEDER), grant number [CTM2014-53902-C2-2-P].
- Subjects :
- 0301 basic medicine
ultraviolet radiation
Emodin
Lichens
Ultraviolet Rays
Pharmaceutical Science
Parietin
blue-green fluorescence
acclimation
Photosynthesis
Photochemistry
Anthraquinone
Analytical Chemistry
substances
anthraquinones
lcsh:QD241-441
03 medical and health sciences
chemistry.chemical_compound
Pigment
Xanthoria parietina
Ascomycota
lcsh:Organic chemistry
Drug Discovery
chlorophyll
Physical and Theoretical Chemistry
Chlorophyll fluorescence
xanthoria parietina
lichen xanthoria-parietina
photosynthesis
biology
Communication
Organic Chemistry
UV-B
biology.organism_classification
Fluorescence
030104 developmental biology
chemistry
Chemistry (miscellaneous)
Chlorophyll
visual_art
parietin
visual_art.visual_art_medium
Molecular Medicine
solar-radiation
fluorescence
ferulic acid
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- RIUR. Repositorio Institucional de la Universidad de La Rioja, instname, Molecules, Vol 23, Iss 7, p 1741 (2018), Addi. Archivo Digital para la Docencia y la Investigación, Molecules : A Journal of Synthetic Chemistry and Natural Product Chemistry
- Accession number :
- edsair.doi.dedup.....8332bd76030a5ece5ba3859c95919332