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Degradation of the photosystem II core complex is independent of chlorophyll degradation mediated by Stay-Green Mg2+dechelatase in Arabidopsis

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Title: Degradation of the photosystem II core complex is independent of chlorophyll degradation mediated by Stay-Green Mg2+dechelatase in Arabidopsis
Authors: Chen, Ying Browse this author
Yamori, Wataru Browse this author
Tanaka, Ayumi Browse this author →KAKEN DB
Tanaka, Ryouichi Browse this author →KAKEN DB
Ito, Hisashi Browse this author
Keywords: Chlorophyll degradation
Photosystem degradation
Issue Date: 3-Apr-2021
Publisher: Elsevier
Journal Title: Plant science
Volume: 307
Start Page: 110902
Publisher DOI: 10.1016/j.plantsci.2021.110902
Abstract: During leaf senescence, the degradation of photosystems and photosynthetic pigments proceeds in a coordinated manner, which would minimize the potential photodamage to cells. Both photosystem I and II are composed of core complexes and peripheral antenna complexes, with the former binding chlorophyll a and the latter binding chlorophyll a and b. Although the degradation of peripheral antenna complexes is initiated by chlorophyll degradation, it remains unclear whether the degradation of core complexes and chlorophyll is coordinated. In this study, we examined the degradation of peripheral antenna and core complexes in the Arabidopsis sgr1/sgr2/ sgrl triple mutant, lacking all the isoforms of chlorophyll a:Mg2+ dechelatase. In this mutant, the degradation of peripheral antenna complexes and photosystem I core complexes was substantially retarded, but the core complexes of photosystem II were rapidly degraded during leaf senescence. On the contrary, the photosynthetic activity declined at a similar rate as in the wild type plants. These results suggest that the degradation of photosystem II core complexes is regulated independently of the major chlorophyll degradation pathway mediated by the dechelatase. The study should contribute to the understanding of the complex molecular mechanisms underlying the degradation of photosystems, which is an essential step during leaf senescence.
Rights: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 伊藤 寿

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