Photorespiration Definition, Diagram, Process, Significance (original) (raw)

Last Updated : 19 May, 2023

Photorespiration is a plant metabolic process, most precisely in the cells of the leaves. Photorespiration is a wasteful pathway that competes with photosynthesis and can have negative effects on plant growth and productivity. Photorespiration is triggered when the concentration of carbon dioxide (CO2) in the leaf is low and the concentration of oxygen (O2) is high.

What is Photorespiration?

Photorespiration is the metabolic process occurred during the Calvin cycle. Photorespiration is also known as C2 Cycle. RuBisCO is the major enzyme in photorespiration. Photorespiration mainly occurs in the C3 plants to take care of the wasteful activity of RuBisCO.

During the Photorespiration mechanism, O2 is needed and CO2 is released in the presence of light.

Photorespiration is exactly the same as the respiration process because in both reactions O2 is used and CO2 is released.

Organelles involved in Photorespiration

3 cell organelles are involved in photorespiration those are:

• Chloroplast
• Peroxisomes
• Mitochondria

Photorespiration is the Wasteful Product

When the concentration of CO2 around the cell.

Photorespiration is started by the oxygenation of ribulose-1,5-bisphosphate-carboxylase/oxygenase (RUBISCO), the very chemical that is additionally liable for CO2 obsession in practically all photosynthetic creatures. Phosphoglycerate shaped by oxygen is reused in the Calvin cycle middle phosphoglycerate in the Photorespiratory pathway. This response overflow consumes energy and lessens the reciprocals and part of them in advance fixed carbon is again delivered as CO2. Along these lines, photorespiration was much of the time seen as an inefficient interaction. In photorespiration, the O2 binds with the enzyme Rubisco and gives the final product 3-Phosphoglycerate in a reduced environment and consumes high energy for the process

Factors influencing Photorespiration

• In submerged, stress conditions, the higher the light concentration higher the photorespiration.
• Influenced by temperature

Benefits of Photorespiration

• It upholds plant-resistant protections.
• It assists in keeping up with the redox equilibrium of the cell.

Significance of Photorespiration

• It is the converse of photosynthesis.
• It decreases the viability of photosynthesis.
• It is an inefficient cycle, as it doesn't deliver ATP or NADPH.