SINGLET OXYGEN PRODUCED BY PHOTOSYSTEMII UPREGULATES THE GLUTATHIONE PEROXIDASE HOMOLOGOUS GENE Gpxh IN CHLAMYDOMONAS REINHARDTII

摘要

Photosynthetic organisms are subjected to photo-oxidative stress when more light energy is absorbed than used in photosynthesis. ~1O_2 seems to be the species important for photoinhibition in vivo (Hideg et al 2001). In the light, highly reactive ~1O_2 can be produced via ~3Chl formation in the reaction centre of photosystem II (PSII) ~3P_(680) is formed by charge recombination reactions and can react with oxygen generating the highly toxic ~1O_2.