Evidence For Decoupled Water Potential Between Myco- And Photobionts During Desiccation In The Tripartite Lichen Peltigera britannica.

Autor:	Petruzzellis F; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy.; Department of Biology, University of Padova, viale G. Colombo 3, 35131, Padova, Italy., Boccato E; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy., Musso C; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy.; Department of Botany, University of Innsbruck, Sternwartestraße 15, 6020 Innsbruck, Austria., Craighero T; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy., Montagner A; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy., Savi T; Department of Integrative Biology and Biodiversity Research, University of Natural Resources and Life Sciences, Vienna, Institute of Botany, Gregor-Mendel-Straße 33, 1180 Vienna, Austria., Muggia L; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy., Tønsberg T; Department of Natural History, University Museum, University of Bergen, Realfagbygget, Allégt. 41, N-5020, Bergen, Norway., Tretiach M; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy., Nardini A; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy., Carniel FC; Department of Life Sciences, University of Trieste, via L. Giorgieri 10, 34127, Trieste, Italy.
Jazyk:	angličtina
Zdroj:	Plant & cell physiology [Plant Cell Physiol] 2024 Dec 06. Date of Electronic Publication: 2024 Dec 06.
DOI:	10.1093/pcp/pcae143
Abstrakt:	In lichens, accurate description of thallus water status is required to understand growth and photosynthesis dynamics. A recent model suggested that myco- and photobiont layers could have a different water energy status (i.e., a different water potential, Ψ) during thallus desiccation, but data supporting this hypothesis were presented only for one chlorolichen. We compared water relations and maximum photosystem II (PSII) efficiency during desiccation in the tripartite lichen Peltigera britannica and its axenically cultured photobionts, the green alga Coccomyxa sp. and the cyanobacterium Nostoc sp. To assess whether myco- and photobiont layers had different Ψ during desiccation, we expected that: i) water relation parameters differ between cultured photobionts and entire thalli; ii) Ψ values inducing a significant drop of PSII efficiency are lower for entire thalli than for cultured photobionts. We found that photobionts had very different water relations parameters than entire thalli, i.e., lower water potential at turgor loss point and higher cell wall elasticity, irrespective of photobiont type, potentially underlying a different drought tolerance. PSII efficiency in entire thalli and cultured photobionts started to decrease below Ψ values inducing turgor loss. Importantly, PSII efficiency in entire thalli decreased at Ψ values significantly more negative than those inducing turgor loss in cultured photobionts. These data support the hypothesis of decoupled Ψ between myco- and photobionts in lichens during desiccation. A higher Ψ ensured to the photobiont layer might represent a key adaptation to prolong photosynthesis during desiccation. (© The Author(s) 2024. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site–for further information please contact journals.permissions@oup.com.)
Databáze:	MEDLINE
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