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Question
Answer the following question.
Why does RuBisCO carry out preferentially carboxylation than oxygenation in C4 plants?
Solution
- In C4 plants, CO2 taken from the atmosphere is accepted by a 3-carbon compound, phosphoenolpyruvic acid in the chloroplasts of mesophyll cells.
- This leads to the formation of 4-carbon compound oxaloacetic acid with the help of enzyme phosphoenolpyruvate carboxylase.
- It is converted to another 4-carbon compound called malate.
- Malate is transported to chloroplasts of bundle sheath cells where malate is converted to pyruvate and releases CO2 in the cytoplasm thus increasing the concentration of CO2 in the bundle sheath cells.
- Chloroplasts of bundle sheath cells contain enzymes of the Calvin cycle.
Thus, due to the high concentration of CO2, RuBisCO participates in carboxylation and not in oxygenation.
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