Photoprotection of photosystems in fluctuating light intensities

Bibliographische Detailangaben
Veröffentlicht in:	Journal of experimental botany. - 1985. - 66(2015), 9 vom: 27. Mai, Seite 2427-36
1. Verfasser:	Allahverdiyeva, Yagut (VerfasserIn)
Weitere Verfasser:	Suorsa, Marjaana, Tikkanen, Mikko, Aro, Eva-Mari
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2015
Zugriff auf das übergeordnete Werk:	Journal of experimental botany
Schlagworte:	Journal Article Research Support, Non-U.S. Gov't Review Cyanobacteria PGR5 PGRL1 Photosystem I (PSI) flavodiiron proteins green algae photodamage mehr... photosynthesis plant terminal oxidases. Photosystem I Protein Complex Photosystem II Protein Complex

Beschreibung
Zusammenfassung:	© The Author 2014. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com. Oxygenic photosynthetic organisms experience strong fluctuations in light intensity in their natural terrestrial and aquatic growth environments. Recent studies with both plants and cyanobacteria have revealed that Photosystem (PS) I is the potential target of damage upon abrupt changes in light intensity. Photosynthetic organisms have, however, developed powerful mechanisms in order to protect their photosynthetic apparatus against such potentially hazardous light conditions. Although the electron transfer chain has remained relatively unchanged in both plant chloroplasts and their cyanobacterial ancestors, the photoprotective and regulatory mechanisms of photosynthetic light reactions have experienced conspicuous evolutionary changes. In cyanobacteria, the specific flavodiiron proteins (Flv1 and Flv3) are responsible for safeguarding PSI under rapidly fluctuating light intensities, whilst the thylakoid located terminal oxidases are involved in the protection of PSII during 12h diurnal cycles involving abrupt, square-wave, changes from dark to high light. Higher plants such as Arabidopsis thaliana have evolved different protective mechanisms. In particular, the PGR5 protein controls electron flow during sudden changes in light intensity by allowing the regulation mostly via the Cytochrome b6f complex. Besides the function of PGR5, plants have also acquired other dynamic regulatory mechanisms, among them the STN7-related LHCII protein phosphorylation that is similarly responsible for protection against rapid changes in the light environment. The green alga Chlamydomonas reinhardtii, as an evolutionary intermediate between cyanobacteria and higher plants, probably possesses both protective mechanisms. In this review, evolutionarily different photoprotective mechanisms under fluctuating light conditions are described and their contributions to cyanobacterial and plant photosynthesis are discussed
Beschreibung:	Date Completed 09.02.2016 Date Revised 08.04.2022 published: Print-Electronic Citation Status MEDLINE
ISSN:	1460-2431
DOI:	10.1093/jxb/eru463