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  • Even though a very few cells in a C_4 plant carry out the biosynthetic - Calvin pathway ,yet they are highly productive. Can you discuss why ?

3. Even though a very few cells in a  C_{4}  plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. Can you discuss why?

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The productivity of a plant is directly proportional to the rate of photosynthesis which in turn is dependent on the amount of carbon dioxide present in a plant. In C4 plants a mechanism for increasing the concentration of carbon dioxide is present. Here, the Calvin cycle occurs in the bundle-sheath cells. The C4 compound malic acid from the mesophyll cells is broken down inside the bundle- sheath cells. This causes the release of carbon dioxide gas. The increase in Carbon dioxide gas ensures that the enzyme RuBisCo does not act as an oxygenase, but as a carboxylase. This prevents losses by photorespiration thus increasing the rate of photosynthesis. Hence, it can be concluded that even though a very few cells in a  C_{4}  plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. 

 

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