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 PHOTOSYNTHESIS

Blackman: 1920s

   
Experiment 1 Experiment 1: Light Intensity v Temperature

 

Observation At low light intensities (A) – when light is a limiting factor – temperature has no effect upon photosynthesis.

Therefore Q10 = 1

At high light intensities (B) – when light is not limiting – temperature has an effect upon photosynthesis. The rate doubles for every 10°C rise in temperature

Therefore Q10 = 2
Conclusion Photosynthesis consists of two reactions
...
I The Light Dependent Reaction

Photochemical and unaffected by the temperature
(Q10 = 1)
II The Light Independent Reaction (aka "Dark" Reaction)

Enzyme controlled as it has a Q10 » 2

 

 

© Paul Billiet 2008