Topic summary
Bundle-sheath
Extracted from the Wikipedia article Vascular bundle.
Bundle-sheath cells
The bundle-sheath cells are the photosynthetic cells arranged into a tightly packed sheath around the vein of a leaf. It forms a protective covering on the leaf vein and consists of one or more cell layers, usually parenchyma. Loosely-arranged mesophyll cells lie between the bundle sheath and the leaf surface. The Calvin cycle is confined to the chloroplasts of these bundle sheath cells in C4 plants. C2 plants also use a variation of this structure.