difference between cyclic and non cyclic phosphorylation
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As the name suggests, in cyclic photophosphorylation the electrons move in a circular pattern. Electron movement is non-cyclic in noncyclic photophosphorylation. *Photophosphorylation: The addition of phosphate group in the presence of light during the light reaction ofphotosynthesis is calledphotophosphorylation.
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Sl. No. Cyclic Photophosphorylation* Noncyclic photophosphorylation
1 As the name suggests, in cyclic photophosphorylation the electrons move in a circular pattern. Electron movement is non-cyclic in noncyclic photophosphorylation.
2 Involves only Photosystem I (PS I) Involves both Photosystem I and II (PS I and PS II)
3 The electron circle is closed The electron circle is not closed
4 Electron is first expelled from the reaction center of PS I – P700 Electron is first expelled from the reaction center of PS II (P680)
5 Electron is returned back to the P700 after passing through the electron transport system (ETS) Electron is not returned to the reaction center (P680), rather it is accepted by NADP+
6 P700 is the electron donor and the final electron acceptor P680 is the first electron donor and NADP+ is the final electron acceptor
7 Photolysis of water does not occur Photolysis of water occur
8 Oxygen is not evolved Oxygen is evolved
9 Synthesize only ATP, no reduced coenzymes are synthesized Synthesize both ATP and reduced coenzymes
10 Cyclic photophosphorylation usually occurs at low light intensity Non-cyclic photophosphorylation is favoured by high light intensity
11 During anaerobic condition, the cyclic photophosphorylation predominates During aerobic condition, the non-cyclic photophosphorylation is predominates
12 Occurs when the concentration of CO2 is less in the atmosphere Occurs when the concentration of CO2 is sufficient in the atmosphere
13 Predominantly occurs in isolated chloroplasts and bacterial photosynthesis Predominantly occurs in green plants
14 Insensitive to DCMU # (cannot be inhibited by DCMU) Sensitive to DCMU (can be inhibited by DCMU)
1 As the name suggests, in cyclic photophosphorylation the electrons move in a circular pattern. Electron movement is non-cyclic in noncyclic photophosphorylation.
2 Involves only Photosystem I (PS I) Involves both Photosystem I and II (PS I and PS II)
3 The electron circle is closed The electron circle is not closed
4 Electron is first expelled from the reaction center of PS I – P700 Electron is first expelled from the reaction center of PS II (P680)
5 Electron is returned back to the P700 after passing through the electron transport system (ETS) Electron is not returned to the reaction center (P680), rather it is accepted by NADP+
6 P700 is the electron donor and the final electron acceptor P680 is the first electron donor and NADP+ is the final electron acceptor
7 Photolysis of water does not occur Photolysis of water occur
8 Oxygen is not evolved Oxygen is evolved
9 Synthesize only ATP, no reduced coenzymes are synthesized Synthesize both ATP and reduced coenzymes
10 Cyclic photophosphorylation usually occurs at low light intensity Non-cyclic photophosphorylation is favoured by high light intensity
11 During anaerobic condition, the cyclic photophosphorylation predominates During aerobic condition, the non-cyclic photophosphorylation is predominates
12 Occurs when the concentration of CO2 is less in the atmosphere Occurs when the concentration of CO2 is sufficient in the atmosphere
13 Predominantly occurs in isolated chloroplasts and bacterial photosynthesis Predominantly occurs in green plants
14 Insensitive to DCMU # (cannot be inhibited by DCMU) Sensitive to DCMU (can be inhibited by DCMU)
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