Limiting factors and the calvin cycle
Made using OCR Biology Textbook A2. Pages 72-73. Hocking, Kennedy, Sochaki and Winterbottom.
- Created by: Former Member
- Created on: 27-12-12 20:45
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- Limiting factors and the Calvin cycle
- Light Intensity
- Measure of how much energy is associated with the light
- Distance from source doubled, light intensity is quartered (inverse square)
- Increased light intensity increases the rate of the light dependent reaction
- More light energy to excited electrons, get more ATP and reduced NADP
- ATP and reduced NADP are used in Calvin cycle to reduced GP to TP and then ATP is used to phosphorylateTP to RuBP
- Therefore in dim light, when L.D.R. doesn't occur, no L.I.R.
- Levels of GP accumulate, as GP can't be converted to TP. = reduced TP and subsequently RuBP
- Therefore in dim light, when L.D.R. doesn't occur, no L.I.R.
- ATP and reduced NADP are used in Calvin cycle to reduced GP to TP and then ATP is used to phosphorylateTP to RuBP
- More light energy to excited electrons, get more ATP and reduced NADP
- Measure of how much energy is associated with the light
- Carbon dioxide
- Increase in Carbon dioxide fixing in the Calvin Cycle.
- Provide light intensity isn't limiting= more GP so subsequently TP and then RuBP
- However, stomata open= increased transpiration, if not replaced by water uptake, stress response, abscisic acid released, stomata close, = less CO2 = reduced rate of photo.
- If CO2 conc is below 0.01% then RuBP, the CO2 acceptor will accumulate= levels of GP and TP fall
- Increase in Carbon dioxide fixing in the Calvin Cycle.
- Temperature
- Light Intensity
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