photosystem

(redirected from Photosytem I)
Related to Photosytem I: Photosystem II

photosystem

(ˈfəʊtəʊˌsɪstəm)
n
(Botany) botany either of two pigment-containing systems, photosystem I or II, in which the light-dependent chemical reactions of photosynthesis occur in the chloroplasts of plants