Photosynthesis, part 10: Z-scheme
Author: Milada Teplá. Faculty of Science, Charles University, www.studiumbiochemie.cz/photosynthesis.html.
PS II creates strong oxidant, capable of oxidizing H2O, and also weak reductant (not capable of reducing NADP+). PS I creates weak oxidant (not capable of oxidizing water), and also strong reductant, which is capable of reducing NADP+. PS I creates weak oxidant (not capable of oxidizing water), and also strong reductant, which is capable of reducing NADP+. In order to carry out the photosynthetic transport of electrons from H2O to NADP+, both photosystems must work together.