What is functional significance of Kranz anatomy?

1.	What is functional significance of Kranz anatomy?
Answer» 1. Leaves of C₄ plants show some structural peculiarities called Kranz anatomy. 2. The chloroplast of mesophyll cells contain enzyme PEP Carboxylase, which can fix CO₂ at low concentration. 3. Thus, light reaction and evolution of O₂ occurs in mesophyll cells. 4. Decarboxylation of malate occurs in bundle sheath cells, which results in release of CO₂, due to which concentration of CO₂ in bundle sheath cells increases. 5. Enzyme RuBisCO present in bundle sheath cells acts as carboxylase in presence of high CO₂ concentraion and catalyses carboxylation of RuBP. 6. Thus, possibility of oxygenation of RuBP is avoided and photorespiration does not take place.

Answer»

1. Leaves of C₄ plants show some structural peculiarities called Kranz anatomy.

2. The chloroplast of mesophyll cells contain enzyme PEP Carboxylase, which can fix CO₂ at low concentration.

3. Thus, light reaction and evolution of O₂ occurs in mesophyll cells.

4. Decarboxylation of malate occurs in bundle sheath cells, which results in release of CO₂, due to which concentration of CO₂ in bundle sheath cells increases.

5. Enzyme RuBisCO present in bundle sheath cells acts as carboxylase in presence of high CO₂ concentraion and catalyses carboxylation of RuBP.

6. Thus, possibility of oxygenation of RuBP is avoided and photorespiration does not take place.

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