Photosystem II (PSII) is one of the integral multi-subunit pigment-protein complexes embedded in thylakoid membranes, which uses solar energy to split water molecules into photon and molecule oxygen.

• 光系统II(PSII)是存在于类囊体膜中的多亚基色素蛋白复合物,主要功能是吸收光能,进行光诱导的电荷分离,产生电子传递并催化水的光解。