An ascospore is a spore contained in an ascus or that was produced inside an ascus. This kind of spore is specific to fungi classified as ascomycetes (Ascomycota).

Typically, a single ascus will contain eight ascospores. The eight spores are produced by a combination of a meiosis division followed by a mitotic division. The meiosis division turns the original diploid zygote nucleus into four haploid ones. That is, the single original cell from which the whole process begins contains two complete sets of chromosomes. In preparation for meiosis, all the DNA of both sets is duplicated, to make a total of four sets. The nucleus that contains the four sets divides in two stages, separating into four new nuclei - each of which has one complete set of chromosomes. Following this process, each of the four new nuclei duplicates its DNA and undergoes a division by mitosis.As a result, the ascus will contain four pairs of spores.

The Fungi Saccharomyces produces ascospores when grown on V-8 medium, acetate ascospor agar, or Gorodkowa medium. These ascospores are globose and located in asci. Each ascus contains 1-4 ascospores. The asci do not rupture at maturity. Ascospores are stained with Kinyoun stain and ascospore stain. When stained with Gram stain, ascospores are gram-negative while vegetative cells are gram-positive

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  • ascospore — [ askɔspɔr ] n. f. • 1846; du gr. askos « outre » et spore ♦ Bot. Spore qui se forme à l intérieur d un asque chez les ascomycètes. ● ascospore nom féminin Spore formée dans un asque. ascospore [askospɔʀ] n. f. ÉT …   Encyclopédie Universelle

  • Ascospore — As co*spore, n. [Ascus + spore.] (Bot.) One of the spores contained in the asci of lichens and fungi. [See Illust. of {Ascus}.] [1913 Webster] …   The Collaborative International Dictionary of English

  • ascospore — ascospore. См. аскоспора. (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.

  • ascospore — [as′kō spôr΄] n. [ ASCO + SPORE] any of the spores in an ascus …   English World dictionary

  • Ascospore — Ascus von Hypocrea virens mit acht doppelzelligen Ascosporen Der Ascus (Plural: Asci, übersetzt: Schlauch) ist das charakteristische und (für den wissenschaftlichen Namen Ascomycota) namensgebende Fortpflanzungsorgan der Schlauchpilze. Es handelt …   Deutsch Wikipedia

  • ascospore — noun Date: 1875 any of the spores contained in an ascus • ascosporic adjective …   New Collegiate Dictionary

  • Ascospore — Asque (cellule) Pour les articles homonymes, voir Asque. Asques avec 16 ascospores Hypocrea virens L asque est une cellule reproductrice, caractéristique des champignons ascomycètes, à l intéri …   Wikipédia en Français

  • ascospore — (as ko spor) A spore contained or produced in an ascus …   Dictionary of microbiology

  • ascospore — Diploid spore formed by ascomycete fungi, contained within an ascus …   Dictionary of molecular biology

  • ascospore — ascosporic /as keuh spawr ik, spor /, ascosporous /as kos peuhr euhs, as keuh spawr , spohr /, adj. /as keuh spawr , spohr /, n. Mycol. a spore formed within an ascus. [1870 75; ASCO + SPORE] * * * …   Universalium

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