MadSci Network: Botany

Subject: O2 in C3 plants--photorespiration and photosynthesis

Date: Thu Apr 4 22:38:09 1996
Posted by: Hsiang Tseng
Grade level: undergrad
School/Organization: Stanford Univ.
City: Stanford State/Province: CA
Country: USA
Area of science: Botany
This seems counterintuitive and inefficient to me...

In the Calvin cycle of photosyn., RuBP carboxylase (C3 plants) fixes CO2

to RuBP.  However, a product of the light rxn. of photosynthesis is O2. 

But O2 is also responsible for photorespiration and competes with CO2 

for RuBP carboxylase.  The two 'halves' of photosynthesis seem to be

self-inhibitory or at least seems to be an inefficient process.  O2 from light rxn.

prevents the CO2 fixing in the Dark Rxn.  Am I missing something here? 

Re: O2 in C3 plants--photorespiration and photosynthesis

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