Retracted: The circadian rhythm regulator RpaA modulates photosynthetic electron transport and alters the preferable temperature range for growth in a cyanobacterium

[摘要] Cyanobacterial strains can grow within a specific temperature range that approximately corresponds to their natural habitat. However, how the p referable t emperature r ange for g rowth (PTRG) is determined at the molecular level remains unclear. In this study, we detected a PTRG upshift in a mutant strain of Synechococcus elongatus PCC 7942 lacking the circadian rhythm regulator RpaA. Subsequent analyses revealed that RpaA decreases the electron transport from photosystem I to NADPH. The change in electron transport likely inhibits H 2 O 2 generation under high-temperature conditions and contributes to the observed PTRG upshift in rpaA -deficient cells. The importance of the effects of the circadian rhythm regulator on the PTRG is discussed.

[关键词] cyanobacteria;preferable temperature range for growth;photosynthesis;RpaA;circadian clock