Difference Between Cyclic And Noncyclic Photophosphorylation

The photosynthesis process completes in the following two steps – light reaction and dark reaction. The light reaction is the light dependent reaction whereas the dark reaction is a light independent reaction.

Photophosphorylation is defined as the addition of phosphate group during the light reaction of photosynthesis in the presence of light. Here the phosphorylation occurs in the presence of light and therefore termed as photophosphorylation.

Photophosphorylation is divided into two types, viz, cyclic photophosphorylation and non-cyclic photophosphorylation.

Let us have a look at the important differences between cyclic and non-cyclic photophosphorylation.

Also Read: Photosynthesis process

Cyclic vs Non-cyclic Photophosphorylation

Following are the important difference between cyclic and non-cyclic photophosphorylation:

Cyclic Photophosphorylation
Noncyclic Photophosphorylation
Found
Anaerobic condition Aerobic condition
Photosystem
PS-I PS-II
Occurs
Photosynthetic bacteria and isolated chloroplast
Algae, cyanobacteria, plants, etc.
Oxygen production
Yes No
Photosynthesis
Anoxygenic Oxygenic
Photolysis
Does not occurs Occurs
Product
ATP Reduced coenzymes and ATP
Electron acceptor
P700 NADP+
Movement of electrons
Cyclic Linear
Electron donor
P700 P680

Cyclic Photophosphorylation

It is the synthesis of ATP coupled with electron transport activated only by PS-I. The process is not affected by inhibitors such as CMU, DCMU and orthophenanthroline. This process is predominantly found in bacteria.

Non-cyclic Photophosphorylation

This process involves two photosystems, PS-I and PS-II. The process also produces NADPH in addition to ATP. It facilitates the synthesis of organic molecules and long term storage of energy.

Also Read: What is photosynthesis

This was an overview of the Difference Between Cyclic And Noncyclic Photophosphorylation. For more details such as the steps involved in the process, register to BYJU’S – the learning App

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