Measured in a bean plant, see Table II:
http://www.plantphysiol.org/content/46/1/1.full.pdf
Also:
The paper
"
5.8 Photosynthetic Quantum Yield and Energy Conversion Efficiency
The theoretical minimum quantum requirement for photosynthesis is 8 quanta for each molecule of oxygen evolved (four quanta required by photosystem II and four by photosystem I). Measurements in algal cells and leaves under optimal conditions (e.g., low light) give quantum requirements of 8-10 photons per oxygen molecule released (see Emerson, 1958). These quantum yield measurements show that the quantum yields of photosystem II and photosystem I reaction centers under optimal conditions are near 100%."
and
"
CO2 + 2H2O + Light Energy ______> [CH2O] + O2 + H2O
So, at 100% of theoretical efficiency, 8 quanta of light will fix the carbon in one molecule of carbon dioxide. Compare that with the bean plant measurements that found 9 - 14 quanta required to fix 1 molecule of CO2.
Threaded Mode
