prothallium

prothallial, prothallic, prothalline /proh thal"een, -uyn/, adj.prothalloid, adj.
/proh thal"ee euhm/, n., pl. prothallia /-thal"ee euh/.
1. Bot. the gametophyte of ferns and related plants.
2. the analogous rudimentary gametophyte of seed-bearing plants.
[1855-60; < NL < Gk pro- PRO-2 + thallíon, dim. of thallós young shoot; see -IUM]

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▪ plant anatomy
      the small, green, heart-shaped structure (gametophyte) of a fern that produces both male and female sex cells (gametes). The prothallium forms from a spore. After fertilization, a young sporophyte plant develops; it consists of a primary root, primary leaf, the rudiment of a new stem, and an organ, called a foot, that absorbs food from the gametophyte.

      The single prothallial cell of some fern and conifer microspores (small reproductive bodies) represents the vegetative body of the male gametophyte.

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Universalium. 2010.

Look at other dictionaries:

  • Prothallium — Pro*thal li*um, n.; pl. {Prothallia}. [NL.] (Bot.) Same as {Prothallus}. [1913 Webster] …   The Collaborative International Dictionary of English

  • prothallium — prothallium. См. проталлий. (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.

  • Prothallĭum — Prothallĭum, Vorkeim, s. Farne, S. 335, und Geschlechtsorgane der Pflanzen …   Meyers Großes Konversations-Lexikon

  • Prothallium — Prothallĭum (grch.), Vorkeim, s. Farne und Tafel: Botanik II, 27 und 31 …   Kleines Konversations-Lexikon

  • Prothallium — Prothallium, sich aus einer Meiospore entwickelnder kurzlebiger Gametophyt der Farnpflanzen und Samenpflanzen.     Bei den Farnpflanzen ist das herzförmige kleine grüne P. als Thallus ausgebildet, der mit einzelligen Rhizoiden am Boden befestigt… …   Deutsch wörterbuch der biologie

  • prothallium — [prō thal′ēəs] n. pl. prothalli [prō thal′ēī΄] or prothalluses [prō thal′ē əm] n. prothallia [prō thal′ēə] [ModL < Gr pro , before + thallos, a shoot (< IE base * dhal , to bloom > Alb dal, to sprout) + IUM] Bot. a minute, flat, greenish …   English World dictionary

  • Prothallium — Als Prothallium (von lat. pro = vor und grch. thallos = Spross) bezeichnet man in der Botanik den haploiden Gametophyt der Farne. Das Prothallium entwickelt sich aus einer vom Sporophyt der Farne produzierten Spore. Es ist relativ kurzlebig,… …   Deutsch Wikipedia

  • Prothallium — A prothallium, or prothallus (from Latin pro = forwards and Greek θαλλος ( thallos ) = twig) is usually a pteridophyte, i.e. spore bearing plant, (almost exclusively ferns) in gametophyte stage in the alternation of generations cycle.… …   Wikipedia

  • prothallium — noun (plural prothallia) Etymology: New Latin, from pro + thallus Date: 1858 prothallus …   New Collegiate Dictionary

  • prothallium — noun a) A plant, usually a pteridophyte, in gametophyte stage in the alternation of generations cycle. b) The young gametophyte of a liverwort or peat moss. Syn: prothallus …   Wiktionary

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