Global CO2 concentration is rising rapidly. Which type of plants are more likely to benefit from...

Global CO2 concentration is rising rapidly. Which type of plants are more likely to benefit from the increased CO2 concentration?

C3 plants benefit most.

Reason why?

Expert Solution

Plants fix carbon dioxide with the help of an enzyme Rubisco. It catalyzes the carboxylation of ribulose-1,5-bisphosphate and produce two molecules of 3-phosphoglycerate. Rubisco has a dual property it can also add molecular oxygen to the ribulose-1,5-bisphosphate, resulting in the formation of one molecule of 3-phosphoglycerate and 2-phosphohlycolate. 2-phosphoglycolate is metabolised through photorespiration. Photorespiration not only consumes energy but also causes net loss of CO₂.

This property of Rubisco is a remnant of the evolutionary history when the atmosphere had high CO₂ concentration and low oxygen concentration. C4 photosynthesis is a way developed by certain plants to cope up with this problem. C4 plants have evolved various anatomical and bio chemical adaptations to increase CO₂ concentration around the Rubisco.

Rise in global CO₂ concentration is having a positive effect on the photosynthesis of C3 plants since high CO₂ concentration is capable of reducing the futile process of photorespiration. A doubling of CO2 may increase photosynthesis rates by as much as 30-100%.

gladiator answered 5 months ago

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