Direct energy transfer from photosystem II to photosystem I confers winter sustainability in Scots Pine.

Autor:	Bag P; Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden., Chukhutsina V; Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.; Department of Life Sciences, Imperial College London, London, UK., Zhang Z; Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden.; State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Shandong, China., Paul S; Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden.; Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden., Ivanov AG; Department of Biology, University of Western Ontario, London, Ontario, Canada.; Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria., Shutova T; Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden., Croce R; Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands., Holzwarth AR; Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands. a.holzwarth@vu.nl., Jansson S; Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden. stefan.jansson@umu.se.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2020 Dec 15; Vol. 11 (1), pp. 6388. Date of Electronic Publication: 2020 Dec 15.
DOI:	10.1038/s41467-020-20137-9
Abstrakt:	Evergreen conifers in boreal forests can survive extremely cold (freezing) temperatures during long dark winter and fully recover during summer. A phenomenon called "sustained quenching" putatively provides photoprotection and enables their survival, but its precise molecular and physiological mechanisms are not understood. To unveil them, here we have analyzed seasonal adjustment of the photosynthetic machinery of Scots pine (Pinus sylvestris) trees by monitoring multi-year changes in weather, chlorophyll fluorescence, chloroplast ultrastructure, and changes in pigment-protein composition. Analysis of Photosystem II and Photosystem I performance parameters indicate that highly dynamic structural and functional seasonal rearrangements of the photosynthetic apparatus occur. Although several mechanisms might contribute to 'sustained quenching' of winter/early spring pine needles, time-resolved fluorescence analysis shows that extreme down-regulation of photosystem II activity along with direct energy transfer from photosystem II to photosystem I play a major role. This mechanism is enabled by extensive thylakoid destacking allowing for the mixing of PSII with PSI complexes. These two linked phenomena play crucial roles in winter acclimation and protection.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu