Xylem


Xylem
Xylem, Holzteil, Gefäßteil, dem Transport von Wasser und darin gelösten Ionen dienendes Leitgewebe in Cormophyten. Zu ihm gehören als Leitungselemente Tracheiden bei Pteridophyten (Farnpflanzen) und Gymnospermen (Nacktsamer), Tracheiden und Tracheen bei den Angiospermen (Bedecktsamer), ferner lebende Holzparenchymzellen (Xylemparenchymzellen) und als Festigungselemente bisweilen tote Holzfasern. Leitbündel bestehen aus X. und Phloem.

Deutsch wörterbuch der biologie. 2013.

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  • Xylem — (8) im Querschnitt eines Blattes; (1) = Cuticula; (2) = obere Epidermis; (3) = Palisadengewebe; (4) = Schwammgewebe; (5) = untere Epidermis; (6) = Spalt der Spaltöffnung; (7) = Schließzellen; (8) = Xylem; (9) = Phloem; (10) = Blattader / Leit …   Deutsch Wikipedia

  • Xylem — er den væsentligste bestanddel af veddet i et træ. Xylem er vaskulært væv, som står for transporten af opløste stoffer og vand fra rødder til blade …   Danske encyklopædi

  • xylem — (n.) woody tissue in higher plants, 1875, from Ger. Xylem, coined from Gk. xylon wood, of unknown origin …   Etymology dictionary

  • Xylem — Xy lem, n. [Gr. xy lon wood.] (Bot.) That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; distinguished from phlo[ e]m. [1913 Webster] …   The Collaborative International Dictionary of English

  • Xylēm — (griech.), s. Leitbündel, S. 390 …   Meyers Großes Konversations-Lexikon

  • Xylem — Xylēm (grch.), der holzige, wasserleitende Teil der Gefäßbündel und somit auch des Stamms …   Kleines Konversations-Lexikon

  • xylem — ► NOUN Botany ▪ the vascular tissue in plants which conducts water and dissolved nutrients upwards from the root and also helps to form the woody element in the stem. ORIGIN from Greek xulon wood …   English terms dictionary

  • xylem — [zī′ləm, zī′lem] n. [Ger < Gr xylon, wood] the woody vascular tissue of a plant, characterized by the presence of vessels or tracheids or both, fibers, and parenchyma, that conducts water and mineral salts in the stems, roots, and leaves and… …   English World dictionary

  • Xylem — Multiple cross sections of a flowering plant stem showing primary and secondary xylem and phloem[1] Xylem is one of the two types of transport tissue in vascular plants. (Phloem is the other). The word xylem is derived from the Classical Greek… …   Wikipedia

  • xylem — /zuy leuhm, lem/, n. Bot. a compound tissue in vascular plants that helps provide support and that conducts water and nutrients upward from the roots, consisting of tracheids, vessels, parenchyma cells, and woody fibers. [1870 75; < G, equiv. to… …   Universalium


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