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Molecules 2018, 23(7), 1741; https://doi.org/10.3390/molecules23071741

Can Parietin Transfer Energy Radiatively to Photosynthetic Pigments?

1
Department Plant Biology and Ecology, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain
2
Faculty of Science and Technology, University of La Rioja (UR), 26006 Logroño (La Rioja), Spain
*
Author to whom correspondence should be addressed.
Received: 22 June 2018 / Revised: 12 July 2018 / Accepted: 16 July 2018 / Published: 17 July 2018
(This article belongs to the Special Issue Lichens: Chemistry, Ecological and Biological Activities II)
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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. View Full-Text
Keywords: anthraquinones; chlorophyll; fluorescence; parietin; photosynthesis; ultraviolet radiation; UV-B; Xanthoria parietina anthraquinones; chlorophyll; fluorescence; parietin; photosynthesis; ultraviolet radiation; UV-B; Xanthoria parietina
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Fernández-Marín, B.; Artetxe, U.; Becerril, J.M.; Martínez-Abaigar, J.; Núñez-Olivera, E.; García-Plazaola, J.I. Can Parietin Transfer Energy Radiatively to Photosynthetic Pigments? Molecules 2018, 23, 1741.

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