Comparative analysis of strategies to prepare electron sinks in aquatic photoautotrophs

Photosynthesis Research
Ginga ShimakawaChikahiro Miyake

Abstract

While subject to illumination, photosystem I (PSI) has the potential to produce reactive oxygen species (ROS) that can cause photo-oxidative damage in oxygenic photoautotrophs. The reaction center chlorophyll in PSI (P700) is kept oxidized in excess light conditions to limit over-excitation of PSI and alleviate the production of ROS. Oxidation of P700 requires a sufficient electron sink for PSI, which is responsible for flavodiiron proteins (FLV) safely dissipating electrons to O2 in cyanobacteria, green algae, and land plants except for angiosperms during short-pulse light (SP) illumination under which photosynthesis and photorespiration do not occur. This fact implies that O2 usage is essential for P700 oxidation but also raises the question why angiosperms lost FLV. Here, we first found that aquatic photoautotrophs in red plastid lineage, in which no gene for FLV has been found, could keep P700 oxidized during SP illumination alleviating the photo-oxidative damage in PSI even without O2 usage. We comprehensively assessed P700 oxidation during SP illumination in the presence and absence of O2 in cyanobacteria (Cyanophyta), green algae (Chlorophyta), angiosperms (Streptophyta), red algae (Rhodophyta), and secondary algae (Cryp...Continue Reading

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Citations

Sep 15, 2019·The Biochemical Journal·Alessandro AlboresiTomas Morosinotto
May 6, 2020·The New Phytologist·Mattia StortiTomas Morosinotto
Nov 22, 2018·Frontiers in Plant Science·Ginga Shimakawa, Chikahiro Miyake
Jun 3, 2021·International Journal of Molecular Sciences·Ginga Shimakawa, Chikahiro Miyake
May 15, 2021·Journal of Experimental Botany·Vesa HavurinneEsa Tyystjärvi
Jul 27, 2021·Photosynthesis Research·Ginga ShimakawaShuji Nakanishi
Jun 26, 2021·Physiologia Plantarum·Nicolò FattoreTomas Morosinotto

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