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Functional Traits in Lichen Ecology: A Review of Challenge and Opportunity
Article

Inhibition of Primary Photosynthesis in Desiccating Antarctic Lichens Differing in Their Photobionts, Thallus Morphology, and Spectral Properties

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Department of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, Building A13/119, 625 00 Brno, Czech Republic
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Laboratory of Plant Ecophysiology, Faculty of Natural Resources, Campus Luis Rivas del Canto, Catholic University of Temuco, Rudecindo Ortega #03694, 4780000 Temuco, Chile
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Laboratory of Mycology and Mycorrhiza, Faculty of Natural Sciences and Oceanography, Campus Concepción, Concepción University, 4030000 Concepción, Chile
*
Author to whom correspondence should be addressed.
Academic Editors: Paolo Giordani, Juri Nascimbene and Renato Benesperi
Microorganisms 2021, 9(4), 818; https://doi.org/10.3390/microorganisms9040818
Received: 1 February 2021 / Revised: 2 April 2021 / Accepted: 7 April 2021 / Published: 13 April 2021
(This article belongs to the Special Issue Lichen Functional Traits and Ecosystem Functions)
Five macrolichens of different thallus morphology from Antarctica (King George Island) were used for this ecophysiological study. The effect of thallus desiccation on primary photosynthetic processes was examined. We investigated the lichens’ responses to the relative water content (RWC) in their thalli during the transition from a wet (RWC of 100%) to a dry state (RWC of 0%). The slow Kautsky kinetics of chlorophyll fluorescence (ChlF) that was recorded during controlled dehydration (RWC decreased from 100 to 0%) and supplemented with a quenching analysis revealed a polyphasic species-specific response of variable fluorescence. The changes in ChlF at a steady state (Fs), potential and effective quantum yields of photosystem II (FV/FM, ΦPSII), and nonphotochemical quenching (NPQ) reflected a desiccation-induced inhibition of the photosynthetic processes. The dehydration-dependent fall in FV/FM and ΦPSII was species-specific, starting at an RWC range of 22–32%. The critical RWC for ΦPSII was below 5%. The changes indicated the involvement of protective mechanisms in the chloroplastic apparatus of lichen photobionts at RWCs of below 20%. In both the wet and dry states, the spectral reflectance curves (SRC) (wavelength 400–800 nm) and indices (NDVI, PRI) of the studied lichen species were measured. Black Himantormia lugubris showed no difference in the SRCs between wet and dry state. Other lichens showed a higher reflectance in the dry state compared to the wet state. The lichen morphology and anatomy data, together with the ChlF and spectral reflectance data, are discussed in relation to its potential for ecophysiological studies in Antarctic lichens. View Full-Text
Keywords: maritime antarctica; King George Island; lichen dehydration; chlorophyll fluorescence; stress tolerance maritime antarctica; King George Island; lichen dehydration; chlorophyll fluorescence; stress tolerance
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MDPI and ACS Style

Barták, M.; Hájek, J.; Orekhova, A.; Villagra, J.; Marín, C.; Palfner, G.; Casanova-Katny, A. Inhibition of Primary Photosynthesis in Desiccating Antarctic Lichens Differing in Their Photobionts, Thallus Morphology, and Spectral Properties. Microorganisms 2021, 9, 818. https://doi.org/10.3390/microorganisms9040818

AMA Style

Barták M, Hájek J, Orekhova A, Villagra J, Marín C, Palfner G, Casanova-Katny A. Inhibition of Primary Photosynthesis in Desiccating Antarctic Lichens Differing in Their Photobionts, Thallus Morphology, and Spectral Properties. Microorganisms. 2021; 9(4):818. https://doi.org/10.3390/microorganisms9040818

Chicago/Turabian Style

Barták, Miloš, Josef Hájek, Alla Orekhova, Johana Villagra, Catalina Marín, Götz Palfner, and Angélica Casanova-Katny. 2021. "Inhibition of Primary Photosynthesis in Desiccating Antarctic Lichens Differing in Their Photobionts, Thallus Morphology, and Spectral Properties" Microorganisms 9, no. 4: 818. https://doi.org/10.3390/microorganisms9040818

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