Exposure of the Cyanobacterium Synechocystis PCC6803 to Salt Stress Induces Concerted Changes in Respiration and Photosynthesis

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In order to survive and to grow in the presence of a high salinity (550 mM NaCl) Synechocystis PCC6803 increases its energetic capacity. The salt-induced increase of electron transport rates involves both cytochrome c oxidase and photosystem I. In contrast, electron transport rates measured through complexes I plus III of the respiratory chain, or through the photosystem II plus cytochrome b_6f complexes of the photosynthetic chain, do not show appreciable changes. The time at which changes in electron transport rates occur in the photosystem I and cytochrome c oxidase complexes after the onset of salt stress indicates similarities in the adaptation of dark respiration and (cyclic) photosynthetic electron flow. Given an increase of whole cell respiration and of PSI cyclic electron flow larger than the neosynthesis of cytochrome aa3 and PSI reaction centers would predict, it appears that both adaptations require more than just synthesis of these two complexes.
日本植物生理学会の論文