Next Article in Journal
Inactivation, Aggregation and Conformational Changes of Polyphenol Oxidase from Quince (Cydonia oblonga Miller) Juice Subjected to Thermal and High-Pressure Carbon Dioxide Treatment
Next Article in Special Issue
tert-Butylphenolic Derivatives from Paenibacillus odorifer—A Case of Bioconversion
Previous Article in Journal
Characterization of the Chloroplast Genome Sequence of Acer miaotaiense: Comparative and Phylogenetic Analyses
Previous Article in Special Issue
Specialized Metabolites of the Lichen Vulpicida pinastri Act as Photoprotective Agents
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessCommunication
Molecules 2018, 23(7), 1741;

Can Parietin Transfer Energy Radiatively to Photosynthetic Pigments?

Department Plant Biology and Ecology, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain
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)
Full-Text   |   PDF [1112 KB, uploaded 17 July 2018]   |  


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

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material


Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top