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Question -

Even though a very few cells in a C4┬аplant carry out thebiosynthetic тАУ Calvin pathway, yet they are highly productive. Can you discusswhy?



Answer -

Plant productivity canbe estimated by the rate at which photosynthesis takes place. The amount ofcarbon dioxide in a plant is directly proportional to the rate ofphotosynthesis. In C4┬аplants, very few of the cells carry outthe biosynthetic pathway yet they are highly productive for the followingreasons.

  • They have a mechanism that increases the CO2┬аconcentration at the site of enzyme.
  • Mesophyll cells are broken down in the bundle sheath cells that results in CO2┬аrelease which inturn increases the intracellular CO2┬аconcentration .
  • Rubisco functions as a carboxylase minimizing the oxygenase activity.
  • Increase in photosynthesis make C4┬аplants more productive.

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