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Endodermis

From Biology-Online Dictionary | Biology-Online Dictionary
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Endodermis

single layer of cells surrounding the central stele (vascular tissue) in roots. The radial and transverse walls contain the hydrophobic Casparian band, that prevents water flow in or out of the stele through the apoplast. Also present in some stems. A single layer of cells found in many plants, where the endodermis, consisting of endodermal cells regulate the flow of water and other materials into the plant, particularly at the roots.