Noncyclic electron flow
TWO THINGS HAPPENING: ATP AND NADPH
Excited e for PII moves through primary electron acceptor (pheophytin), e carriers (PQ, b6f, PC) and then ETC to replace an electron lost by photosystem I. This occurs twice
Prior to, Z protein in PII splits water into H and G+ and electrons. One of these electrons are used to replace the missing e in PII. Oxygen is diffused out of cell, leaving protons in thylakoid space. These electrons will pass a proton pump called Q cycle to create an H+ gradient for chemiosmosis to photophosphorylate ADP to ATP. Four H+ per ATP per pair of e
- e in PI is energized by photon
- e goes to ferredoxin -> NADP reductase (to reduce to produce NADPH).