| Comments |
p.1555 right column 2nd paragraph:"Although some of the carbon of 2-phosphoglycolate is rescued by photorespiration, an energy-requiring salvage pathway, the result of the oxygenase reaction is a constant drain on the pool of RuBP and a decrease of the efficiency of carbon fixation by up to 50%. This has implications for crop yield, plant nitrogen and water usage, and for the global carbon cycle. From another perspective, it has been argued that such energy consumption may be beneficial in some circumstances. For instance, it may function as a sink, dissipating excess photosynthetic reductant under photoinhibitory conditions when CO2 availability is limited (Osmond, 1981)." |