Elevated Levels of Specific Carotenoids During Acclimation to Strong Light Protect the Repair of Photosystem II in Synechocystis sp. PCC 6803.

ABSTRACT: The tolerance of photosynthesis to strong light increases in photosynthetic organisms during acclimation to strong light. We investigated the role of carotenoids in the protection of photosystem II (PSII) from photoinhibition after acclimation to strong light in the cyanobacterium Synechocystis sp. PCC 6803. In cells that had been grown under strong light at 1,000 μmol photons m^-2 s^-1 (SL), specific carotenoids, namely, zeaxanthin, echinenone, and myxoxanthophyll, accumulated at high levels, and the photoinhibition of PSII was less marked than in cells that had been grown under standard growth light at 70 μmol photons m^-2 s^-1 (GL). The rate of photodamage to PSII, as monitored in the presence of lincomycin, did not differ between cells gro

SUBMITTER: Izuhara T 

PROVIDER: S-EPMC7358549 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature