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Limiting Factors in Photosynthesis

Limiting Factors in Photosynthesis. Song Hee Bae IB1 Biology. The Concept of Limiting Factors. Light intensity Carbon dioxide concentration Temperature Changing the limiting factor increases or decreases the rate. The Effect of Light Intensity. Not usually the limiting factor

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Limiting Factors in Photosynthesis

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  1. Limiting Factors in Photosynthesis Song Hee Bae IB1 Biology

  2. The Concept of Limiting Factors • Light intensity • Carbon dioxide concentration • Temperature • Changing the limiting factor increases or decreases the rate

  3. The Effect of Light Intensity • Not usually the limiting factor • At low light intensities, shortage of NADPH and ATP • Rate-limiting where Glycerate 3-phosphate is reduced

  4. The Effect of CO₂ Concentration • At low and medium CO₂ • Rate-limiting where CO₂ is fixed to produce glycerate 3-phosphate • Level of CO₂ is never very high • Often the limiting factor

  5. The Effect of Temperature • At low temperature, enzymes work slowly • At high temperature, RuBP ineffective • Rate-limiting where CO₂ is fixed

  6. Temperature CO₂ Concentration Light intensity

  7. Results of Limiting Factors

  8. Cyclic Photophosphorylation • When light is not limiting factor • NADPH accumulation, NADP+ shortage • Normal flow of electrons inhibited • Alternative route is cyclic photophosphorylation • See page 81

  9. Vocabulary • Limiting factor • Cyclic photophosphorylation Reference • Study guide page 81

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