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- Ascus abstract "An ascus (plural asci; from Greek ἀσκός ảskós 'skin bag') is the sexual spore-bearing cell produced in ascomycete fungi. Asci usually contain eight ascospores, produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or species can occur in numbers of one (e.g. Monosporascus cannonballus), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g. Tympanis) with hundreds of conidia, or the ascospores may fragment, e.g. some Cordyceps, also filling the asci with smaller cells. Ascospores are nonmotile, usually single celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes. Mitotic divisions within the developing spores populate each resulting cell in septate ascospores with nuclei. The term ocular chamber, or oculus, refers to the epiplasm (the portion of cytoplasm not used in ascospore formation) that is surrounded by the "bourrelet" (the thickened tissue near the top of the ascus).In many cases the asci are formed in a regular layer, the hymenium, in a fruiting body which is visible to the naked eye, here called an ascocarp or ascoma. In other cases, such as single-celled yeasts, no such structures are found. In rare cases asci of some genera can regularly develop inside older discharged asci one after another, e.g. Dipodascus.Asci normally release their spores by bursting at the tip, but they may also digest themselves passively releasing the ascospores either in a liquid or as a dry powder. Typically, actively discharging asci have a specially differentiated tip, either a pore or an operculum. In some hymenium forming genera, when one ascus bursts, it can trigger the bursting of many other asci in the ascocarp resulting in a massive discharge visible as a cloud of spores – the phenomenon called "puffing". This is an example of positive feedback. A faint hissing sound can also be heard for species of Peziza and other cup fungi.Asci, notably those of Neurospora crassa, have been used in laboratories for studying the process of meiosis, because the four cells produced by meiosis line up in regular order. By modifying genes coding for spore color and nutritional requirements, the biologist can study crossing over and other phenomena. The formation of asci and their use in genetic analysis are described in detail in Neurospora crassa.Asci of most Pezizomycotina develop after the formation of croziers at their base. The croziers help maintain a brief dikaryon. The compatible nuclei of the dikaryon merge forming a diploid nucleus that then undergoes meiosis and ultimately internal ascospore formation. Members of the Taphrinomycotina and Saccharomycotina do not form croziers.".
- Ascus thumbnail Morelasci.jpg?width=300.
- Ascus wikiPageExternalLink ascus.htm.
- Ascus wikiPageExternalLink ascus134.html.
- Ascus wikiPageID "220446".
- Ascus wikiPageLength "6808".
- Ascus wikiPageOutDegree "50".
- Ascus wikiPageRevisionID "675473491".
- Ascus wikiPageWikiLink Ancient_Greek.
- Ascus wikiPageWikiLink Apothecium.
- Ascus wikiPageWikiLink Apple_scab.
- Ascus wikiPageWikiLink Ascocarp.
- Ascus wikiPageWikiLink Ascomycota.
- Ascus wikiPageWikiLink Ascospore.
- Ascus wikiPageWikiLink Category:Fungal_morphology_and_anatomy.
- Ascus wikiPageWikiLink Category:Mycology.
- Ascus wikiPageWikiLink Cell_(biology).
- Ascus wikiPageWikiLink Chaetothyriomycetes.
- Ascus wikiPageWikiLink Chromosomal_crossover.
- Ascus wikiPageWikiLink Cleistothecium.
- Ascus wikiPageWikiLink Conidia.
- Ascus wikiPageWikiLink Conidium.
- Ascus wikiPageWikiLink Cordyceps.
- Ascus wikiPageWikiLink Crozier_(mycology).
- Ascus wikiPageWikiLink Cup_fungi.
- Ascus wikiPageWikiLink Cytoplasm.
- Ascus wikiPageWikiLink Dikaryon.
- Ascus wikiPageWikiLink Diploid.
- Ascus wikiPageWikiLink Dipodascus.
- Ascus wikiPageWikiLink Dothideomycetes.
- Ascus wikiPageWikiLink Dutch_elm_disease.
- Ascus wikiPageWikiLink File:Morelasci.jpg.
- Ascus wikiPageWikiLink Fungi.
- Ascus wikiPageWikiLink Fungus.
- Ascus wikiPageWikiLink Gene.
- Ascus wikiPageWikiLink Hymenium.
- Ascus wikiPageWikiLink Meiosis.
- Ascus wikiPageWikiLink Mitosis.
- Ascus wikiPageWikiLink Monosporascus_cannonballus.
- Ascus wikiPageWikiLink Morchella.
- Ascus wikiPageWikiLink Morel.
- Ascus wikiPageWikiLink Neurospora_crassa.
- Ascus wikiPageWikiLink Operculum_(botany).
- Ascus wikiPageWikiLink Perithecium.
- Ascus wikiPageWikiLink Peziza.
- Ascus wikiPageWikiLink Pezizaceae.
- Ascus wikiPageWikiLink Pezizomycotina.
- Ascus wikiPageWikiLink Ploidy.
- Ascus wikiPageWikiLink Positive_feedback.
- Ascus wikiPageWikiLink Pseudothecium.
- Ascus wikiPageWikiLink Relief_valve.
- Ascus wikiPageWikiLink Saccharomycotina.
- Ascus wikiPageWikiLink Septum.
- Ascus wikiPageWikiLink Skin.
- Ascus wikiPageWikiLink Taphrinomycotina.
- Ascus wikiPageWikiLink Tympanis.
- Ascus wikiPageWikiLink Yeast.
- Ascus wikiPageWikiLink File:Ascus.gif.
- Ascus wikiPageWikiLink File:Hypomyces_chrysospermus.jpg.
- Ascus wikiPageWikiLink File:Sordaria_fimicola_asci.jpg.
- Ascus wikiPageWikiLinkText "Asci".
- Ascus wikiPageWikiLinkText "Ascus".
- Ascus wikiPageWikiLinkText "Ascus#Ascus classification".
- Ascus wikiPageWikiLinkText "asci".
- Ascus wikiPageWikiLinkText "ascosporic".
- Ascus wikiPageWikiLinkText "ascus".
- Ascus wikiPageWikiLinkText "spore-bearing cells".
- Ascus wikiPageWikiLinkText "spore-bearing structures".
- Ascus hasPhotoCollection Ascus.
- Ascus wikiPageUsesTemplate Template:About.
- Ascus wikiPageUsesTemplate Template:Dead_link.
- Ascus wikiPageUsesTemplate Template:Fungus_structure.
- Ascus wikiPageUsesTemplate Template:Refimprove.
- Ascus wikiPageUsesTemplate Template:Reflist.
- Ascus subject Category:Fungal_morphology_and_anatomy.
- Ascus subject Category:Mycology.
- Ascus hypernym Cell.
- Ascus type AnatomicalStructure.
- Ascus type Article.
- Ascus type Article.
- Ascus comment "An ascus (plural asci; from Greek ἀσκός ảskós 'skin bag') is the sexual spore-bearing cell produced in ascomycete fungi. Asci usually contain eight ascospores, produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or species can occur in numbers of one (e.g. Monosporascus cannonballus), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g.".
- Ascus label "Ascus".
- Ascus sameAs Сумка,_мікалогія.
- Ascus sameAs Asc_(micologia).
- Ascus sameAs Vřecko.
- Ascus sameAs Ascus.
- Ascus sameAs Asko.
- Ascus sameAs Asca_(micología).
- Ascus sameAs Eoskott.
- Ascus sameAs Asku.
- Ascus sameAs Asque_(cellule).
- Ascus sameAs Asco_(micoloxía).
- Ascus sameAs Ascus.
- Ascus sameAs Sporenzakje.
- Ascus sameAs Worek_grzyba.
- Ascus sameAs Asco_(fungos).
- Ascus sameAs m.01g67f.
- Ascus sameAs Аск_(микология).
- Ascus sameAs Askogon.
- Ascus sameAs Aske.