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Two Quenchers Formed During Photodamage of Phostosystem II and The Role of One Quencher in Preemptive Photoprotection
Australian Natl Univ, Coll Sci, Res Sch Biol, GPO Box 4, Canberra, ACT 2601, Australia.ORCID iD: 0000-0002-8905-1618
Wageningen Univ, Lab Biophys, POB 8128, NL-6700 ET Wageningen, Netherlands;BioSolar Cells Project Off, POB 98, NL-6700 AB Wageningen, Netherlands;Univ Sao Paulo, Sao Carlos Inst Phys, Sao Carlos, SP, Brazil.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Molecular Biomimetics. Australian Natl Univ, Coll Sci, Res Sch Biol, GPO Box 4, Canberra, ACT 2601, Australia.ORCID iD: 0000-0001-5732-1524
Australian Natl Univ, Coll Sci, Res Sch Biol, GPO Box 4, Canberra, ACT 2601, Australia.
2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 17275Article in journal (Refereed) Published
Abstract [en]

The quenching of chlorophyll fluorescence caused by photodamage of Photosystem II (qI) is a well recognized phenomenon, where the nature and physiological role of which are still debatable. Paradoxically, photodamage to the reaction centre of Photosystem II is supposed to be alleviated by excitation quenching mechanisms which manifest as fluorescence quenchers. Here we investigated the time course of PSII photodamage in vivo and in vitro and that of picosecond time-resolved chlorophyll fluorescence (quencher formation). Two long-lived fluorescence quenching processes during photodamage were observed and were formed at different speeds. The slow-developing quenching process exhibited a time course similar to that of the accumulation of photodamaged PSII, while the fast-developing process took place faster than the light-induced PSII damage. We attribute the slow process to the accumulation of photodamaged PSII and the fast process to an independent quenching mechanism that precedes PSII photodamage and that alleviates the inactivation of the PSII reaction centre.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019. Vol. 9, article id 17275
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Biophysics
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URN: urn:nbn:se:uu:diva-400109DOI: 10.1038/s41598-019-53030-7ISI: 000498048500010PubMedID: 31754181OAI: oai:DiVA.org:uu-400109DiVA, id: diva2:1380875
Funder
Australian Research Council, DP120100872Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19Bibliographically approved

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