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Question
Answer the following question.
What is the functional significance of Kranz anatomy?
Solution
- Leaves of C4 plants show some structural peculiarities called Kranz anatomy.
- The chloroplast of mesophyll cells contains the enzyme PEP Carboxylase, which can fix CO2 at low concentration.
- Thus, light reaction and evolution of O2 occur in mesophyll cells.
- 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.
- Enzyme RuBisCO present in bundle sheath cells acts as carboxylase in presence of high CO2 concentration and catalyzes the carboxylation of RuBP.
- Thus, the possibility of oxygenation of RuBP is avoided and photorespiration does not take place.
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