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Simplified photorespiration and Calvin cycle. Photorespiration (also known as the oxidative photosynthetic carbon cycle, or C2 photosynthesis) is a process in plant metabolism which attempts to reduce the consequences of a wasteful oxygenation reaction by the enzyme RuBisCO.
Photorespiration, or 'photo-respiration', is a process in plant metabolism. A sugar has oxygen added to it by the enzyme (RuBisCO), instead of carbon dioxide during normal photosynthesis.This process reduces efficiency of photosynthesis.hotorespiration can occur when carbon dioxide levels are low, for example, when the stomata are closed to prevent water loss during drought.