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Photoprotective strategies in the motile cryptophyte alga Rhodomonas salina-role of non-photochemical quenching, ions, photoinhibition, and cell motility
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SYSNO ASEP 0517919 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Photoprotective strategies in the motile cryptophyte alga Rhodomonas salina-role of non-photochemical quenching, ions, photoinhibition, and cell motility Author(s) Kaňa, Radek (MBU-M) RID, ORCID
Kotabová, Eva (MBU-M) RID, ORCID
Šedivá, Barbora (MBU-M)
Kuthanová Trsková, Eliška (MBU-M) ORCIDSource Title Folia Microbiologica. - : Springer - ISSN 0015-5632
Roč. 64, 5 SI (2019), s. 691-703Number of pages 13 s. Language eng - English Country NL - Netherlands Keywords light-harvesting complex ; transthylakoid proton gradient ; photosystem-ii Subject RIV EE - Microbiology, Virology OECD category Microbiology R&D Projects LO1416 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) ED2.1.00/19.0392 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA16-10088S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support MBU-M - RVO:61388971 UT WOS 000496409500010 EID SCOPUS 85069867169 DOI 10.1007/s12223-019-00742-y Annotation We explored photoprotective strategies in a cryptophyte alga Rhodomonas salina. This cryptophytic alga represents phototrophs where chlorophyll a/c antennas in thylakoids are combined with additional light-harvesting system formed by phycobiliproteins in the chloroplast lumen. The fastest response to excessive irradiation is induction of non-photochemical quenching (NPQ). The maximal NPQ appears already after 20 s of excessive irradiation. This initial phase of NPQ is sensitive to Ca2+ channel inhibitor (diltiazem) and disappears, also, in the presence of non-actin, an ionophore for monovalent cations. The prolonged exposure to high light of R. salina cells causes photoinhibition of photosystem II (PSII) that can be further enhanced when Ca2+ fluxes are inhibited by diltiazem. The light-induced reduction in PSII photochemical activity is smaller when compared with immotile diatom Phaeodactylum tricornutum. We explain this as a result of their different photoprotective strategies. Besides the protective role of NPQ, the motile R. salina also minimizes high light exposure by increased cell velocity by almost 25% percent (25% from 82 to 104 mu m/s). We suggest that motility of algal cells might have a photoprotective role at high light because algal cell rotation around longitudinal axes changes continual irradiation to periodically fluctuating light. Workplace Institute of Microbiology Contact Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Year of Publishing 2020 Electronic address https://link.springer.com/article/10.1007%2Fs12223-019-00742-y
Number of the records: 1