meristem

/mer"euh stem'/, n. Bot.
embryonic tissue in plants; undifferentiated, growing, actively dividing cells.
[1870-75; < Gk merist(ós) divided, distributed (equiv. to *merid-, s. of merízein to divide into parts (deriv. of méris part, share) + -tos v. adj. suffix) + -em < Gk -ema termination of nouns denoting result of action; cf. -EME]

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In plants, region of cells capable of division and growth.

Meristems are classified by location as apical, or primary (at root and shoot tips), lateral, or secondary (in the vascular cambium and cork cambium), or intercalary (at internodes, stem regions between the places at which leaves attach, and at leaf bases, especially in certain monocots, e.g., grasses). Apical meristems give rise to the primary plant body. Lateral meristems provide increase in stem girth. Injured tissues can convert other cells to new meristem for wound healing.

Meristem

J.M. Langham

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▪ plant anatomy
 region of cells capable of division and growth in plants. Meristem cells are typically small cells the diameters of which in different directions are about equal. They have a dense cytoplasm and relatively few small vacuoles (watery saclike enclosures).

      Meristems are classified by their location in the plant as apical (located at root and shoot tips), lateral (in the vascular and cork cambia), and intercalary (at internodes, or stem regions between the places at which leaves attach, and leaf bases, especially of certain monocotyledons—e.g., grasses). Apical meristems are also known as primary meristems because they give rise to the primary plant body. Lateral meristems are secondary meristems because they are responsible for secondary growth, or increase in stem girth and thickness. Meristems form anew from other cells in injured tissues and are responsible for wound healing.

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Universalium. 2010.

Look at other dictionaries:

  • Meristem — oder Bildungsgewebe bezeichnet einen Gewebetyp der Pflanzen, der aus undifferenzierten Zellen besteht und an dem Wachstum durch Zellteilung stattfinden kann. Der Term „Meristem“ wurde erstmals von Karl Wilhelm von Nägeli (1817–1891) in seinem… …   Deutsch Wikipedia

  • meristem — MERISTÉM, meristeme, s.n. Ţesut vegetal tânăr situat la extremitatea rădăcinii, tulpinii şi ramurilor, care se înmulţeşte continuu în vederea creşterii acestora. – Din fr. méristème. Trimis de LauraGellner, 28.05.2004. Sursa: DEX 98  meristém s …   Dicționar Român

  • Meristem — Mer i*stem, n. [Gr. ? divisible.] (Bot.) A tissue of growing cells, or cells capable of further division. [1913 Webster] …   The Collaborative International Dictionary of English

  • meristem — meristem. См. меристема. (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.

  • Meristēm — (griech.), s. Bildungsgewebe …   Meyers Großes Konversations-Lexikon

  • Meristem — Meristēm (grch.), in der Botanik jedes lebhaft durch Teilung sich vermehrende Zellgewebe, welches teils an den fortwachsenden Spitzen (Ur M.), teils auch in ältern Partien (Folge M.) sich befindet …   Kleines Konversations-Lexikon

  • Meristem — Meristem, Bildungsgewebe, aus undifferenzierten Zellen bestehendes pflanzliches Gewebe. Primäre M. stammen vom Urmeristem des Embryos ab und haben ihre Teilungsfähigkeit uneingeschränkt beibehalten. Zu ihnen gehören die ⇒ Apikalm. der Cormophyten …   Deutsch wörterbuch der biologie

  • meristem — (n.) growing cellular tissues of plants, 1862, formed irregularly from Gk. meristos divided, divisible (from merizein to divide, distribute, from meros a part, a share; see MERIT (Cf. merit) (n.)) + ending from XYLEM (Cf. xylem), etc …   Etymology dictionary

  • meristem — [ mɛrɪstɛm] noun Botany a region of plant tissue consisting of actively dividing cells. Derivatives meristematic stə matɪk adjective Origin C19: from Gk meristos divisible + em on the pattern of xylem …   English new terms dictionary

  • meristem — merìstem m DEFINICIJA bot. tvorno tkivo kod biljaka građeno od stanica koje trajno zadržavaju sposobnost diobe ETIMOLOGIJA grč. meristḗs: djelitelj …   Hrvatski jezični portal

  • meristem — /ˈmɛristɛm/ (say mereestem) noun embryonic tissue; undifferentiated, growing, actively dividing cells. {Greek meristos divided + ēm(a), noun suffix} –meristematic /mɛrəstəˈmætɪk/ (say meruhstuh matik), adjective …   Australian English dictionary

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