Why does photorespiration increase with temperature?

The decrease in photosynthesis rate, or rise in photorespiration, as temperature increases is due to an increase in the affinity of rubisco and oxygen. Rubisco combines more with oxygen relative to carbon dioxide as temperature rises, which slows the rate of photosynthesis.

At what temperature does photorespiration occur?

Photorespiration is one of the biggest metabolic fluxes in plants, and photorespiratory rates can be c. 25% of photosynthetic rates in C3 leaves at 25°C (Sharkey, 1988). Respiration involves the breakdown of glucose formed via photosynthesis to produce ATP to fuel plant metabolism.

What happens to Phosphoglycolate in photorespiration?

In the photorespiration pathway, 6 O2 molecules combine with 6 RuBP acceptors, making 6 3-PGA molecules and 6 phosphoglycolate molecules. The 6 phosphoglycolate molecules enter a salvage pathway, which converts them into 3 3-PGA molecules and releases 3 carbons as CO2.

Does photorespiration occur in low temperatures?

Photorespiration only occurs under high light intensities. It also requires high temperatures and high oxygen levels to occur.

Does photorespiration release oxygen?

1.1. The Origin and Significance of Photorespiration. Photorespiration is the process of light-dependent uptake of molecular oxygen (O2) concomitant with release of carbon dioxide (CO2) from organic compounds. The gas exchange resembles respiration and is the reverse of photosynthesis where CO2 is fixed and O2 released …

Why is photorespiration called C2 cycle?

Photorespiration is also called the C2 cycle because the first main product formed is phosphoglycolate which is a 2 carbon molecule. Phosphoglycolate is later converted to glycolate. This process of photorespiration converts the sugar phosphates back to carbon dioxide.

Which plants keep their stomata open only at night?

Jade plants, succulent plants, pineapple, Keep stomata CLOSED during the day and OPEN at night. Store carbon dioxide as an organic acid.

What is the difference between respiration and photorespiration?

Hint: Respiration is the process in which intake of oxygen and release of carbon dioxide happen and photorespiration is the process in which the enzyme RuBisCo oxygenates RuBP by wasting the energy produced by photosynthesis….

Respiration	Photorespiration
It is a catabolic process.	It is also a catabolic process.

Does photorespiration happen at night?

Key points: Photorespiration is a wasteful pathway that occurs when the Calvin cycle enzyme rubisco acts on oxygen rather than carbon dioxide. Crassulacean acid metabolism (CAM) plants minimize photorespiration and save water by separating these steps in time, between night and day.

Why is photorespiration necessary evil?

Photorespiration is either a necessary evil of plant metabolism or it may have some adaptive function that is not apparent. Some have proposed that photorespiration allows plant leaves to use up excess light energy and reduce photooxidative damage when the plant is water-stressed and the stomata are closed.

Is photorespiration known as C2 cycle?

Complete step by step answer: Photorespiration is also called the C2 cycle because the first main product formed is phosphoglycolate which is a 2 carbon molecule. This process of photorespiration converts the sugar phosphates back to carbon dioxide.

How are O 2 and co 2 related to photorespiration?

The relative levels of O 2 and CO 2 are responsible for determination of the occurrence of photorespiration as both of these gases (O 2 and CO 2) compete for the same active site of enzyme Rubisco. Increased O 2 level increases photorespiration; while increased CO 2 level decreases photorespiration, and increases C 3 photosynthesis.

What is the chemical formula for 2 phosphoglycolate?

From Wikipedia, the free encyclopedia 2-Phosphoglycolate (chemical formula C 2 H 2 O 6 P 3-; also known as phosphoglycolate, 2-PG, or PG) is a natural metabolic product of the photorespiration process mediated by the enzyme ribulose 1,5-bisphosphate carboxylase (RuBisCo).

Why is photorespiration called a glycolate pathway?

This process is called photorespiration or glycolate pathway as it occurs at high rate in the presence of light. As already mentioned that photorespiration is a loss to the net productivity of green plants having Calvin cycle. The green plants having Calvin cycle are C 3 plants.

What is the role of photorespiration in the Calvin cycle?

Photorespiration serves as a salvage pathway that converts 2-PG into non-toxic metabolites. Contrary to the Calvin cycle, this pathway is responsible a net loss of previously fixed carbon.