Epicotyl

Epicotyl

In plant physiology, the epicotyl is the embryonic shoot above the cotyledons. In most plants the epicotyl will eventually develop into the stem and the leaves of the plant. In dicots, the hypocotyl is what appears to be the base stem under the spent withered cotyledons, and the shoot just above that is the epicotyl. The hypocotyl is what develops into the roots of the plant. In monocot plants, the first shoot that emerges from the ground or from the seed is the epicotyl, from which the first shoots and leaves emerge.

In sunflower seedlings, the difference between epicotyl and hypocotyl can be seen from the parts of the stem divided by the first pair of leaves. Here the stem above the cotyledons is covered in tiny hairs whereas the region of stem below (hypocotyl) is smooth.

Lengthening of the epicotyl is thought to be controlled by the phytochrome photoreceptors.

See also

* Hypocotyl


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  • epicotyl — epicotyl. См. надсемядольное колено. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Epicotyl — Epicotyl, Sprossabschnitt zwischen Keimblättern und ersten Laubblättern beim Embryo der Cormophyten …   Deutsch wörterbuch der biologie

  • epicotyl — [ep΄i kät′ l] n. [< EPI + COTYL(EDON)] Bot. that part of the stem of a seedling or embryo just above the cotyledons epicotyledonary [ep΄ə kät lēd′ n er΄ē] adj …   English World dictionary

  • Epicotyl — Als Epikotyl (von gr.: epi = oberhalb, kotyle = Höhlung; engl.: Epicotyl) wird der Sprossabschnitt einer Pflanze bezeichnet, der zwischen den Keimblättern (= Kotyledonen) und den nächstfolgenden Blättern, also den Primärblättern der Pflanze liegt …   Deutsch Wikipedia

  • epicotyl — antskiltis statusas T sritis augalininkystė apibrėžtis Pirmasis daigo stiebo tarpubamblis aukščiau skilčialapių. atitikmenys: angl. epicotyl rus. эпикотиль ryšiai: sinonimas – epikotilis …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • epicotyl — noun Etymology: epi + cotyledon Date: 1880 the portion of the axis of a plant embryo or seedling above the cotyledonary node …   New Collegiate Dictionary

  • Épicotyl — Épicotyle L épicotyle est la partie de la jeune plante en germination située au dessus de l insertion du ou des cotylédons. Voir aussi Hypocotyle Organes végétaux Organes aériens Bourgeon • Bulbe • Écorce • Épine • Feuille • Foliole • Coty …   Wikipédia en Français

  • epicotyl — The first shoot of a plant embryo or seedling, above the point of insertion of the cotyledon(s). Can be relatively long in some seedlings showing etiolation …   Dictionary of molecular biology

  • epicotyl — /ep i kot l, ep i kot l/, n. Bot. (in the embryo of a plant) that part of the stem above the cotyledons. See diag. under cotyledon. [1875 80; EPI + Gk kotýle cup] * * * …   Universalium

  • epicotyl — noun In plants with seeds, that portion of the embryo or seedling above the cotyledons …   Wiktionary

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