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Control of the maximal chlorophyll fluorescence yield by the Q(B) binding site
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SYSNO ASEP 0489336 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Control of the maximal chlorophyll fluorescence yield by the Q(B) binding site Author(s) Prášil, Ondřej (MBU-M) RID, ORCID
Kolber, Z. S. (US)
Falkowski, P. G. (US)Source Title Photosynthetica. - : Ústav experimentální botaniky AV ČR, v. v. i. - ISSN 0300-3604
Roč. 56, č. 1 (2018), s. 150-162Number of pages 13 s. Language eng - English Country NL - Netherlands Keywords conformational change ; electron transport ; photosystem II Subject RIV EE - Microbiology, Virology OECD category Microbiology R&D Projects LO1416 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support MBU-M - RVO:61388971 UT WOS 000430309200013 EID SCOPUS 85040336704 DOI 10.1007/s11099-018-0768-x Annotation Differences in maximal yields of chlorophyll variable fluorescence (F-m) induced by single turnover (ST) and multiple turnover (MT) excitation are as great as 40%. Using mutants of Chlamydomonas reinhardtii we investigated potential mechanisms controlling F-m above and beyond the Q(A) redox level. F-m was low when the Q(B) binding site was occupied by PQ and high when the Q(B) binding site was empty or occupied by a PSII herbicide. Furthermore, in mutants with impaired rates of plastoquinol reoxidation, F-m was reached rapidly during MT excitation. In PSII particles with no mobile PQ pool, F-m was virtually identical to that obtained in the presence of PSII herbicides. We have developed a model to account for the variations in maximal fluorescence yields based on the occupancy of the Q(B) binding site. The model predicts that the variations in maximal fluorescence yields are caused by the capacity of secondary electron acceptors to reoxidize Q(A)(-). Workplace Institute of Microbiology Contact Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Year of Publishing 2019
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