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Cam pathway

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Amrin Ansari

CAM refers to crassulacean acid metabolism, a carbon fixation pathway discovered in 1804. CAM plants open their stomata at night to fix carbon dioxide as organic acids, then close stomata during the day to use the stored carbon in photosynthesis. This temporal separation of carbon fixation allows CAM plants to conserve water in arid environments. CAM can be identified in succulent plants that show diurnal fluctuations in organic acids and have high phosphoenolpyruvate carboxylase activity and nighttime stomatal opening.

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 CAM stands for --------------  Discovered by Heyne (1804) and later by Aubert (1815).  Term coined by Ranson and Thomas (1940)  Mechanism for concentrating CO2  CAM is not restricted to the family Crassulaceae  Enables plants to improve H2O Efficiency  CAM plants have advantage in dry environment 1/14/2015 11:13 AM 2
1/14/2015 11:13 AM 3 CAM can be defined according to the following criteria Succulents plants Diurnal fluctuation of organic acid High activities of PEP carboxylase Stomata opening Tropical origin and xeric
1/14/2015 11:13 AM 4 CAM PLANTS
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1/14/2015 11:13 AM 7 ATP ADP Inhibited by insensitive to Pi H2O SER-DH PEP CARBOXYLASE DAY FORM SER- OP PEP CARBOXYLASE NIGHT FORM
C4 vs CAM Summary 1/14/2015 11:13 AM 8 C4 plants separate 2 steps of C fixation anatomically in 2 different cells CAM plants separate 2 steps of C fixation temporally at 2 different times
1/14/2015 11:13 AM 9 • PHOTOSYNTHETIC SYSTEMS BY SUSAN M. DANKS, E.HILARY EVANS PETER A. WHITTAKER • CAM BY IRWIN. P. TING MARTIN GIBBS • PLANT PHYSIOLOGY BY TEIZ AND ZEIGER • CELL BIOLOGY BY GOVINDJEE
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Cam pathway

  • 2.  CAM stands for --------------  Discovered by Heyne (1804) and later by Aubert (1815).  Term coined by Ranson and Thomas (1940)  Mechanism for concentrating CO2  CAM is not restricted to the family Crassulaceae  Enables plants to improve H2O Efficiency  CAM plants have advantage in dry environment 1/14/2015 11:13 AM 2
  • 3. 1/14/2015 11:13 AM 3 CAM can be defined according to the following criteria Succulents plants Diurnal fluctuation of organic acid High activities of PEP carboxylase Stomata opening Tropical origin and xeric
  • 4. 1/14/2015 11:13 AM 4 CAM PLANTS
  • 7. 1/14/2015 11:13 AM 7 ATP ADP Inhibited by insensitive to Pi H2O SER-DH PEP CARBOXYLASE DAY FORM SER- OP PEP CARBOXYLASE NIGHT FORM
  • 8. C4 vs CAM Summary 1/14/2015 11:13 AM 8 C4 plants separate 2 steps of C fixation anatomically in 2 different cells CAM plants separate 2 steps of C fixation temporally at 2 different times
  • 9. 1/14/2015 11:13 AM 9 • PHOTOSYNTHETIC SYSTEMS BY SUSAN M. DANKS, E.HILARY EVANS PETER A. WHITTAKER • CAM BY IRWIN. P. TING MARTIN GIBBS • PLANT PHYSIOLOGY BY TEIZ AND ZEIGER • CELL BIOLOGY BY GOVINDJEE