Cyclic Photophosphorylation vs. Non Cyclic Photophosphorylation
Key Differences
Comparison Chart
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Active Centre
Produces
Takes Place In
What is Cyclic Photophosphorylation?
It is the process of photophosphorylation that contains a cyclic transport of electrons, its active center for the reaction is photosystem1 (P700), it does not involve photosystem2 (P680). Cyclic photophosphorylation involves photosystem1, in this process electrons travel in a cyclic manner and travel back to photosystem1. In this process adenosine triphosphate (ATP) is produced that is utilized by plants as an energy source, this ATP is used in the Calvin Cycle. The process of Calvin cycle is directly dependent on the presence of the ATP, in case if there are no sufficient ATP’s, the process does not proceed further. Cyclic photophosphorylation does not involve the production of oxygen, photolysis (water splitting) is also absent in this. Furthermore, this process does not produce NADP and oxygen but still produces ATP. The process of cyclic photophosphorylation takes place mostly in bacteria; it is less seen in plants.
What is Non Cyclic Photophosphorylation?
It is the process of photophosphorylation that does not have a cyclic transport of electrons, its active center for the reaction is photosystem2 (P680), but is also involve in photosystem1 (P700). In noncyclic photophosphorylation. The transport of electrons is in a non-cyclic manner, these electrons from the photosystem1 (P700) are accepted by NADP. In non-cyclic photophosphorylation ATP and NADP both are produced that are utilized as an energy source, (NADP is a rich energy source as 1 NADP give energy equivalent to 3 ATPs). In non-cyclic photophosphorylation oxygen is evolved as a by-product of the reaction and is finally emitted in the surrounding environment, it also has photolysis in it, or water splitting is present. The process of non-cyclic photophosphorylation is mostly seen in green plants.
