Limiting factors photosynthesis
- Created by: Remya Salimkumar
- Created on: 07-06-15 09:22
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- LIMITING FACTORS
- CO2 CONCENTRATION
- high
- more CO2 fixation in LIS
- more GP, TP and RuBP made
- more CO2 fixation in LIS
- low
- less CO2 available for fixation
- less GP and TP produced
- less CO2 available for fixation
- concentration can be increased by burning fuels
- high
- LIGHT INTENSITY
- high
- more excitation of electrons so more photophosphorylation
- more ATP and reduced NADP formed
- more GP reduced and phosphorylated to TP
- more TP phosphorylated to RuBP
- more ATP and reduced NADP formed
- more excitation of electrons so more photophosphorylation
- low
- GP not changed to TP
- less RuBP formed
- less CO2 fixed so less GP formed
- less RuBP formed
- GP not changed to TP
- used to excite electrons
- used for photolysis of water
- causes stomata to open to allow CO2 in
- high
- TEMPERATURE
- No effect on LDS as no enzymes used
- LIS is series of biochemical steps catalysed by enzymes
- between 0-25 degrees
- rate roughly doubles for every 10 degree increase
- above 25 degrees
- enzymes work less efficiently as they change shape and denature
- oxygen more likely to bind with rubisco
- less CO2 fixation
- more water loss
- stomata close
- less CO2
- stomata close
- between 0-25 degrees
- can be controlled using:
- heater
- ventilation
- air conditioning
- CO2 CONCENTRATION
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