<P> Cytochrome b6f and ATP synthase work together to create ATP . This process is called photophosphorylation , which occurs in two different ways . In non-cyclic photophosphorylation , cytochrome b6f uses the energy of electrons from PSII to pump protons from the stroma to the lumen . The proton gradient across the thylakoid membrane creates a proton - motive force , used by ATP synthase to form ATP . In cyclic photophosphorylation , cytochrome b6f uses the energy of electrons from not only PSII but also PSI to create more ATP and to stop the production of NADPH . Cyclic phosphorylation is important to create ATP and maintain NADPH in the right proportion for the light - independent reactions . </P>
<P> Cytochrome b6f and ATP synthase work together to create ATP . This process is called photophosphorylation , which occurs in two different ways . In non-cyclic photophosphorylation , cytochrome b6f uses the energy of electrons from PSII to pump protons from the stroma to the lumen . The proton gradient across the thylakoid membrane creates a proton - motive force , used by ATP synthase to form ATP . In cyclic photophosphorylation , cytochrome b6f uses the energy of electrons from not only PSII but also PSI to create more ATP and to stop the production of NADPH . Cyclic phosphorylation is important to create ATP and maintain NADPH in the right proportion for the light - independent reactions . </P>
atp synthesis during the light-dependent reactions occurs by which process
atp synthesis during the light-dependent reactions occurs by which process
photophosphorylation
photophosphorylation