~20 % of net photosynthesis
||Soybean Glycine max
||Bauwe H, Hagemann M, Fernie AR. Photorespiration: players, partners and origin. Trends Plant Sci. 2010 Jun15(6):330-6. doi: 10.1016/j.tplants.2010.03.006. p.330 right column top paragraphPubMed ID20403720
||L. Cegelski, J. Schaefer NMR determination of photorespiration in intact leaves using in vivo 13CO2 labeling J. Magn. Reson., 178 (2006), pp. 1–10PubMed ID16289757
||p.330 right column top paragraph:"Quantitatively, if considered in terms of mass flow, photorespiration likely constitutes the second-most important process in the biogeosphere, exceeded only by photosynthesis itself. This is because cellular O2 concentrations are typically much higher than those of CO2. Therefore, although Rubisco strongly favours CO2 over O2, most land plants produce large amounts of 2PG during the day. Photorespiratory CO2 losses are correspondingly high they amount to about 20% of C3 plant net-photosynthesis in moderate conditions [primary source] and can be even higher in warm and dry environments. Therefore, photorespiration has been a prime target for crop improvement ref 8 and ref 9 and even more so in recent years in which a steadily growing world population faces limited natural supplies and increasingly serious challenges from climate change."