fotosystem
Photosystems are highly organized complexes in the thylakoid membranes of chloroplasts and cyanobacterial membranes that capture light energy and drive the primary photochemical reactions of oxygenic photosynthesis. They consist of antenna pigment–protein complexes that harvest light and a reaction-center core where electron transfer occurs.
Two major photosystems participate in the light reactions: photosystem II (PSII) and photosystem I (PSI). PSII
PSI contains the P700 reaction center and further energizes electrons to reduce ferredoxin, which in turn reduces
Antennas differ among organisms: higher plants and green algae use chlorophyll a/b–containing light-harvesting complexes, while cyanobacteria