photorespiration
Meaning
A process in plants, especially in C3 plants, where oxygen is taken up and carbon dioxide is released in the presence of light, which reduces the efficiency of photosynthesis.
Structure
Usage
High temperatures can increase the rate of photorespiration in many crops.
Scientists are studying genetic modifications to reduce photorespiration and improve crop yields.
Unlike standard respiration, photorespiration is dependent on light intensity.
Etymology
The word 'photorespiration' is a modern scientific compound, formed in the 20th century to describe a specific biochemical process. It combines the Greek-derived element 'photo-', meaning 'light', with the Latin-derived biological term 'respiration', meaning 'breathing'. Literally, it translates to "light-breathing," a logical but somewhat paradoxical name. The term was coined because this process resembles respiration (using oxygen and releasing carbon dioxide) but is directly stimulated by light and occurs alongside photosynthesis in plant chloroplasts, representing a competitive and often wasteful pathway.
Analysis
photo: From Greek 'phōs, phōt-' (light). A combining form meaning "light" in scientific terms. respiration: From Latin 'respiratio' (breathing). The core noun form meaning the act of breathing.