What does photorespiration mean?
Definitions for photorespiration
pho·tores·pi·ra·tion
This dictionary definitions page includes all the possible meanings, example usage and translations of the word photorespiration.
Wiktionary
photorespirationnoun
the light-dependent release of carbon dioxide and uptake of oxygen in photosynthetic organisms; an unavoidable side reaction of photosynthesis
Wikidata
Photorespiration
Photorespiration is a process in plant metabolism which attempts to ameliorate the consequences of a wasteful oxygenation reaction by the enzyme RuBisCO. The desired reaction is the addition of carbon dioxide to RuBP, a key step in the Calvin-Benson cycle, however approximately 25% of reactions by RuBisCO instead add oxygen to RuBP, producing a product that cannot be used within the Calvin-Benson cycle. This process reduces efficiency of photosynthesis, potentially reducing photosynthetic output by 25% in C3 plants. Photorespiration involves a complex network of enzyme reactions that exchange metabolites between chloroplasts, leaf peroxisomes and mitochondria. The oxygenation reaction of RuBisCO is a wasteful process because 3-Phosphoglycerate is created at a reduced rate and higher metabolic cost compared with RuBP carboxylase activity. While photorespiratory carbon cycling results in the formation of G3P eventually, there is still a net loss of carbon and nitrogen, as ammonia. The ammonia must be detoxified at a substantial cost to the cell. Photorespiration also incurs a direct cost of 2ATP and one NADH.
Numerology
Chaldean Numerology
The numerical value of photorespiration in Chaldean Numerology is: 7
Pythagorean Numerology
The numerical value of photorespiration in Pythagorean Numerology is: 2
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"photorespiration." Definitions.net. STANDS4 LLC, 2024. Web. 25 Apr. 2024. <https://www.definitions.net/definition/photorespiration>.
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