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C4 Plants
C4 plants have a mechanism to deal with photorespiration: they physically separate the light and dark reactions.
- The light-dependent reactions occur in the mesophyll.
- The Calvin cycle occurs in the bundle sheath cells.
- The result is no build up of O2 near Rubisco.
Reminder of Light-Dependent Reactions
The Strategy of C4 Plants
- CO2 fixation occurs in the mesophyll by PEP carboxylase to produce oxaloacetate.
- Oxaloacetate is converted to malate and transported to the bundle sheath cells.
- Malate is broken down to release CO2 which then feeds into the Calvin cycle.
- A 3-carbon molecule called pyruvate is returned to the mesophyll and converted back to PEP.
Examples of C4 Plants:
Usually found in hot, dry climates: sugar cane, certain types of grass, maize (corn).
Which of the following is true about the mechanism that C4 plants use to prevent photorespiration?