If the hydrogen pump protein in photosystem II does not have enough H+ ions into the thylakoid there will be a decrease in the production of ATP and a decrease in the production of NADPH.
The right answer is there will be a decrease in the production of ATP and NADPH.
ATP synthase chloroplasts (such as mitochondria and bacteria) is an ATPase type F, also called F1Fo ATPsynthase. When the proton gradient is favorable, the enzyme couples the synthesis of ATP (from ADP and Pi) to the spontaneous proton flux that takes place towards the membrane face (outwards). . It should be noted that if there is no proton gradient (neither membrane potential nor pH gradient) to direct the synthesis reaction, or the hydrogen can not pass through the enzyme, the Equilibrium constant of the reaction favors the reverse reaction of hydrolysis (ATPase activity) and therefore no formation of ATP and moreover no formation of NADPH from H +.
