The Effect of ADP, ATP and DIO-9 on the H⁺/e^- Ratio in Spinach Chloroplasts

Abstract

Electron transport in chloroplasts is coupled both to ATP synthesis, and to proton translocation that results in the formation of a pH gradient.The relationship between these three processes may be explained in terms of both the chemical hypothesis and the chemiosmotic hypothesis (see GREVILLE 1969) The chemical hypothesis shown in scheme A, assumes that electron transport is coupled to the formation of a high energy chemical compound (~) which provides the energy for the alternative reactions of ATP synthesis and the formation of a pH gradient.