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- Rubisco accounts for 25–30% of leaf nitrogen in C3 plants, whereas C4 plants contain three to six times less Rubisco.
- In C4 plants, mesophyll cells contain PEP carboxylase and few chloroplasts, while bundle sheath cells, which surround the xylem and phloem, contain rubisco and many chloroplasts.
- The physical separation of biochemical activities in C4 plants acts as a carbon dioxide concentrating mechanism for rubisco.
- C4 plants exhibit no photorespiration in intact leaves, even though their rubisco enzyme retains oxygenase activity.
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The Ecology of Photosynthetic Pathways | Learn Science at Scitable nature.com 4 facts
measurementRubisco accounts for 25–30% of leaf nitrogen in C3 plants, whereas C4 plants contain three to six times less Rubisco.
claimIn C4 plants, mesophyll cells contain PEP carboxylase and few chloroplasts, while bundle sheath cells, which surround the xylem and phloem, contain rubisco and many chloroplasts.
claimThe physical separation of biochemical activities in C4 plants acts as a carbon dioxide concentrating mechanism for rubisco.
claimC4 plants exhibit no photorespiration in intact leaves, even though their rubisco enzyme retains oxygenase activity.