Cyclic-phosphosphorylatio results in the formation of

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Cyclic-phosphosphorylation involves only pigment system-I. When the photons activate PS-I, a pair of electrons are raised to a higher energy leuel. They are coptured by primary acceptor, which passes them on to ferredoxin, plastoquinone, cytochrom complex, plastocyanin and finally back to reaction centre of PS-I, ie, P700. At eachj step of electron transfer, the electrons lose potential energy. Their ttrip down hill is caused by the transport chain to pump H+ across the thylakoid membrane. The proton gradient thus established is responsible for forming ATP (2 molecules). No reduction of NADP to NADPH + H+.

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