photorespirationn.
/ˌfəʊtəʊrɛspᵻˈreɪʃn/, U.S. /ˌfoʊdoʊrɛspəˈreɪʃ(ə)n/ Botany and Biochemistry.
A light-dependent biochemical process in plants resulting in the consumption of oxygen and the release of carbon dioxide (contrary to the process of photosynthesis, and similar to ordinary respiration), which is now known to occur in many higher plants at low concentrations of carbon dioxide, catalysed by ribulose 1,5-bisphosphate carboxylase (Rubisco).
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photorespiration1945
1945 E. I. Rabinowitch Photosynthesis I. xx. 569 We now come to the problem of ‘photorespiration’ proper, that is, a direct photochemical acceleration of normal respiration which disappears in the dark as instantaneously as does photosynthesis.
1966 Physiologia Plantarum 19 732 Evolution of carbon dioxide in light, or photorespiration, was affected by oxygen... Oxygen had no effect on dark respiration. This discrepancy..can best be explained by an assumption that photorespiration and dark respiration are two different processes.
1977 I. M. Campbell Energy & Atmosphere iv. 76 Plants with high rates of photorespiration such as wheat.
1989 B. Alberts et al. Molecular Biol. Cell (ed. 2) vii. 371 It is not known whether photorespiration has some function in the plant or is simply a means of returning to the carbon-fixation pathway some of the carbon diverted into phosphoglycolate by the undesirable reactivity of oxygen with ribulose 1,5-bisphosphate.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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