Singlet oxygen production by photosystem II is caused by misses of the oxygen evolving complex.

ABSTRACT: Singlet oxygen (¹ O₂ ) is a harmful species that functions also as a signaling molecule. In chloroplasts, ¹ O₂ is produced via charge recombination reactions in photosystem II, but which recombination pathway(s) produce triplet Chl and ¹ O₂ remains open. Furthermore, the role of ¹ O₂ in photoinhibition is not clear. We compared temperature dependences of ¹ O₂ production, photoinhibition, and recombination pathways. ¹ O₂ production by pumpkin thylakoids increased from -2 to +35°C, ruling out recombination of the primary charge pair as a main contributor. S₂ Q_A ^- or S₂ Q_B ^- recombination pathways,

SUBMITTER: Mattila H 

PROVIDER: S-EPMC10092662 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature