In C4 plants, bundle sheath cells carrying out Calvin cycle are very few in number. Then also, C4 plants are highly productive. Explain.

Monjur Alahi

In C4 plants, bundle sheath cells carrying out Calvin cycle are very few in number. Then also, C4 plants are highly productive. Explain.


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Salim Ahmed Kawsar

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1. C4 plants have special type of leaf anatomy called Kranz anatomy. 

2. In C4 plants, CO2 fixation occurs twice. 

3. In these plants, chloroplasts of mesophyll cells contain enzyme PEP carboxylase which fixes atmospheric CO2 . 

4. Thus, first CO2 fixation occurs in mesophyll cells. 

5. Decarboxylation of malic acid in bundle sheath cells results in increase in CO2 concentration. 

6. Thus, RuBisCO acts as carboxylase and brings about carboxylation of RuBP. 

7. Due to this oxygenation of RuBP and photorespiration is prevented.

8. Thus, despite of having less number of bundle sheath cells carrying out Calvin cycle, C4 plants are highly productive.

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