Ratio of RuBisCO carboxylation to oxygenation at CO2 level of 210 ppm

Range 0.41 unitless
Organism Biosphere
Reference Sharkey T.D. (1988) Estimating the rate of photorespiration in leaves. Physiologia Plantarum, 73, 147–152. DOI: 10.1111/j.1399-3054.1988.tb09205.x p.149 right column 3rd paragraph
Comments p.149 right column 3rd paragraph:"When the CO2 level is 210 ppm, φ is 0.41. If [investigators] use a specific example of a leaf photosynthesizing at 30µmol/m^2/s, with a rate of non-photorespiratory respiration of 1µmol/m^2/s, [they] can use eq. 8 to calculate the rate of oxygenation to be 16µmol/m^2/s. Since one CO2 is released for every two oxygenations, the rate of photorespiration is 8µmol/m^2/s. Thus the rate of photorespiratory CO2 release is 26% of the rate of net CO2 assimilation."
Entered by Uri M
ID 111971