cambium


cambium
cambial, adj.
/kam"bee euhm/, n., pl. cambiums, cambia /-bee euh/. Bot.
a layer of delicate meristematic tissue between the inner bark or phloem and the wood or xylem, which produces new phloem on the outside and new xylem on the inside in stems, roots, etc., originating all secondary growth in plants and forming the annual rings of wood.
[1665-75; < LL: an exchange, barter; akin to L cambiare to exchange]

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In plants, a layer of actively dividing cells between xylem (fluid-conducting) and phloem (food-conducting) tissues that is responsible for the secondary growth of stems and roots, resulting in an increase in thickness.

A cambium may also form within callus tissues. See also bark, wood.

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▪ plant anatomy
plural  Cambiums, or Cambia,  

      in plants, layer of actively dividing cells between xylem (wood) and phloem (bast) tissues that is responsible for the secondary growth of stems and roots (secondary growth occurs after the first season and results in increase in thickness). Theoretically, the cambium is a single layer of cells, called initial cells; practically, it is difficult to distinguish the initials from their still-undifferentiated daughter cells, and several cell layers are collectively called the cambium, or cambial zone. Cambial cells divide to produce secondary xylem cells toward the central axis of the stem and secondary phloem cells toward the outside. The cambium originates from undifferentiated cells that have retained their embryonic capacity for continued growth and differentiation. A cambium may also form within callus tissues—masses of cells that grow over the injured surface of a wound, leading to healing.

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Universalium. 2010.

Look at other dictionaries:

  • cambium — [ kɑ̃bjɔm ] n. m. • 1560; lat. bot., de cambiare « changer » ♦ Bot. Assise génératrice annulaire des tiges et des racines (dicotylédones, gymnospermes), qui donne naissance au bois et au liber secondaires (cambium interne) et au liège (cambium… …   Encyclopédie Universelle

  • Cámbium — Saltar a navegación, búsqueda El cámbium es un tejido vegetal meristemático específico de las plantas leñosas, situado entre la corteza y el leño, compuesto normalmente por una capa única de células embrionarias. Cada año el cámbium origina dos… …   Wikipedia Español

  • Cambium — Cam bi*um, n. [LL. cambium exchange, fr. L. cambire to exchange. It was supposed that cambium was sap changing into wood.] 1. (Bot.) A series of formative cells lying outside of the wood proper and inside of the inner bark. The growth of new wood …   The Collaborative International Dictionary of English

  • cambium — CÁMBIUM s.n. v. cambiu. Trimis de valeriu, 13.09.2007. Sursa: DEX 98  CÁMBIUM s.n. (La arbori) Ţesut vegetal tânăr, în formaţie, aflat între coajă şi alburn. [pron. bi um, pl. muri, var. cambiu s.n. / < …   Dicționar Român

  • Cambium — Cambium, teilungsfähiges Gewebe in Sprossachsen und Wurzeln von Gymnospermen und dicotylen Angiospermen; scheidet nach innen Holz, nach außen Bast ab und hat große Bedeutung für das ⇒ sekundäre Dickenwachstum. Das C. ist ein ⇒ Meristem, das im… …   Deutsch wörterbuch der biologie

  • cambium — 1670s in botany sense, from L.L. cambium exchange, from L. cambiare change (see CHANGE (Cf. change) (v.)) …   Etymology dictionary

  • cámbium — (Del b. lat. cambium). m. Bot. Estrato celular de las plantas leñosas, responsable del engrosamiento de tallos y raíces …   Diccionario de la lengua española

  • Cambium — (Bot.), Pflanzensaft …   Pierer's Universal-Lexikon

  • Cambĭum — (neulat., ital. Cambio), Wechsel; daher: Cambist (Cambiator), Wechsler, auch Angeber des Wechsels; Cambiogeschäft, Wechselgeschäft, Cambioconto etc.; Cambiiren, Wechselgeschäfte treiben; Campii actio, Wechselklage; Cambial, was auf Wechsel Bezug… …   Pierer's Universal-Lexikon

  • Cambĭum — (Kambium), s. Bildungsgewebe …   Meyers Großes Konversations-Lexikon

  • cambium — 1. capa celular más interna del periostio, de aspecto laxo, que se desarrolla durante la osificación. 2. capa celular del tejido de formación que se encuentra entre la madera …   Diccionario médico


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