Kranz anatomy

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Kranz anatomy A special structure in the leaves of plants that have a C4 pathway of carbon dioxide fixation. The leaves contain a ring of mesophyll cells, containing a few small chloroplasts concerned with the initial fixing of carbon dioxide, surrounding a sheath of parenchyma cells (the bundle sheath) which has large chloroplasts involved in the Calvin cycle.

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Kranz anatomy The arrangement of palisade mesophyll cells in a circle around the vascular bundle of C4 plants. See bundle sheath cells.