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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 ...
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Title: Limiting Factors in Photosynthesis 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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