Endodermis

Endodermis

Literally meaning "inner skin," endodermis is the layer of tissue deep in vascular plants.

In plants, it is a thin layer of parenchyma found in roots, just outside the vascular cylinder. It regulates water flow. It consists of a single=celled ring which forms a selective barrier between the outer cortex and the inner pericycletissue. In the roots, the endodermis cells are impregnated suberin ,a waxy substance which is water resistant, to form a distinctive Casparian strips and prevent movement of water via the apoplast pathway. Water carrying mineral salts can only enter the root through the interior of cells (the symplast) as opposed to passing between cells (the apoplast). This means that the plant can directly regulate what enters the root proper. The endodermis cells contain starch granules as energy store. Mineral ions are activelt secreted into the xlem vessels to maintain root pressure.


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  • Endodermis — En do*der mis, n. [NL. See {Endoderm}.] (Bot.) A layer of cells forming a kind of cuticle inside of the proper cortical layer, or surrounding an individual fibrovascular bundle. [1913 Webster] …   The Collaborative International Dictionary of English

  • Endodérmis — (griech.), Schutzscheidengewebe, s. Leitungsgewebe …   Meyers Großes Konversations-Lexikon

  • Endodermis — Endodermis, verkorktes, meist einschichtiges, pflanzliches Abschlussgewebe aus lückenlos zusammenschließenden Zellen, meist primären Ursprungs; findet sich bisweilen in Sprossachsen (z.B. Sumpf und Wasserpflanzen), regelmäßig in Wurzeln, wo es… …   Deutsch wörterbuch der biologie

  • endodermis — [en΄dō dʉr′mis] n. the specialized innermost layer of cells of the cortex in roots and many stems …   English World dictionary

  • Endodermis — Querschnitt durch eine Wurzel von Selaginella mit Zentralzylinder und Endodermis, im Inneren Xylem, umgeben von Phloem. Die Endodermis ist ein wichtiges Merkmal der Wurzeln von Pflanzen. Sie ist die dem Zentralzylinder naheliegendste Schicht der… …   Deutsch Wikipedia

  • Endodermis — En|do|dẹr|mis 〈f.; , men〉 für wasserlösl. Stoffe schwer durchlässige, innerste Rindenschicht der Wurzel [<grch. endon „drinnen, innerhalb“ + derma „Haut“] * * * Endodẹrmis   [zu griechisch dérma »Haut«] die, /...men, pflanzliche… …   Universal-Lexikon

  • endodermis — noun a) In a plant stem or root, a cylinder of cells the separates the outer cortex from the central core. The endodermis controls flow of water and minerals within the plant. In most plants, this tissue is restricted to the roots. b) The deepest …   Wiktionary

  • endodermis — ► sustantivo femenino BOTÁNICA Capa más profunda de la corteza primaria de las raíces y tallos. IRREG. plural endodermis * * * ► femenino BOTÁNICA Estrato celular más interno de la corteza primaria …   Enciclopedia Universal

  • endodermis — noun Etymology: New Latin Date: 1884 the innermost tissue of the cortex in many roots and stems …   New Collegiate Dictionary

  • 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… …   Dictionary of molecular biology

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