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 only in heterosporous organisms. In seed plants the microspores give rise to the pollen grains, and the megaspores are formed within the developing seed. Most plants that reproduce by spore without seed only produce one class of spore. In the ferns, the only heterosporous plants are aquatic or semi-aquatic, including the genera Marsilea, Regnellidium, Pilularia, Salvinia, and Azolla. This condition is also known in the lycopod genus Selaginella and in the quillwort genus Isoëtes.

In zoology, the small swarm-spores of Sarcodina are called microspores.

This botany article is a stub. You can help Wikipedia by expanding it.v · Categories: Botany stubs Plant reproduction Wikimedia Foundation. 2010. Игры ⚽ Нужно сделать НИР? Swindle (Transformers) Sundridge with Ide Hill Look at other dictionaries: 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 — 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… …   Medical dictionary 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 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”