microspore

microspore
mi·cro·spore 'mī-krə-.spō(ə)r, -.spȯ(ə)r n
1) any of the spores in heterosporous plants that give rise to male gametophytes and are generally smaller than the megaspore
2) the smaller of two forms of spores produced by various protozoans (as radiolarians) compare MACROSPORE

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mi·cro·spore (miґkro-spor) [micro- + spore] 1. the smaller spore form when spores of two sizes are present, as in certain fungi and protozoa. 2. in heterogenous plants, one of four haploid spores, usually smaller than the megaspore, formed in the microsporangium from a microspore mother cell, and from which the microgametophyte, or male gametophyte, develops. See also pollen.

Medical dictionary. 2011.

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  • microspore — [ mikrospɔr ] n. f. • 1855; de micro et spore ♦ Bot. Spore mâle, de petites dimensions, de végétaux qui produisent aussi des macrospores. ● microspore nom féminin Nom donné aux spores les plus petites des végétaux, qui produisent des prothalles… …   Encyclopédie Universelle

  • Microspore — Mi cro*spore (m[imac] kr[ o]*sp[=o]r), n. [Micro + spore.] (Bot.) One of the exceedingly minute spores found in certain flowerless plants, as {Selaginella} and {Isoetes}, which bear two kinds of spores, one very much smaller than the other. Cf.… …   The Collaborative International Dictionary of English

  • microspore — microspore. См. микроспора. (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.

  • microspore — (n.) 1856, from MICRO (Cf. micro ) + SPORE (Cf. spore) …   Etymology dictionary

  • microspore — [mī′krō spôr΄] n. a haploid spore, usually smaller than a megaspore of the same plant, which gives rise to a male gametophyte: found in all seed plants, where it is an immature pollen grain, and in many lower vascular plants microsporic adj …   English World dictionary

  • Microspore — Une microspore est cellule haploïde issue de la méiose qui donne un gamétophyte mâle. Chez les végétaux, quatre microspores haploïdes (n) sont issues de la méiose d une cellule mère diploïde (2n), le microsporocyte. Cette division cellulaire a… …   Wikipédia en Français

  • Microspore — In biology, a microspore is a small spore as contrasted to the larger megaspore. In botany, microspores develop into male gametophytes, whereas megaspores develop into female gametophytes. The combination of megaspores and microspores is found… …   Wikipedia

  • microspore — mikrospora statusas T sritis ekologija ir aplinkotyra apibrėžtis Heterosporinių augalų mažoji spora, iš kurios išauga vyriškasis polaiškis. atitikmenys: angl. microspore vok. Mikrospore, f rus. микроспора, f …   Ekologijos terminų aiškinamasis žodynas

  • microspore — mikrospora statusas T sritis ekologija ir aplinkotyra apibrėžtis Ląstelė, iš kurios išsivysto žiedadulkė. atitikmenys: angl. microspore vok. Mikrospore, f rus. микроспора, f …   Ekologijos terminų aiškinamasis žodynas

  • microspore — mikrospora statusas T sritis augalininkystė apibrėžtis Pirmoji pušūnų ir magnolijūnų vyriškojo gametofito generacijos ląstelė, iš kurios vėliau susidaro žiedadulkė. atitikmenys: angl. microspore rus. микроспора …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

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