Difference between revisions of "Spore ontogeny"

'''spore ontogeny''' ([[Category:Noun]][[:Category:Noun|noun]], [[ascospore term]], [[Category:Spore morphology term]][[:Category:Spore morphology term|spore morphology term]], ''pl.'' spore ontogenies) – the development of the [[ascospore]]. In ascospores with distinct pigmentation, wall differentiation and ornamentation up to four stages may be distinguished: (1) ''immature:'' not pigmented, often without [[septa]] or with a thin, barely visible [[septum]], sometimes with [[apically]] wall thickenings but otherwise with no distinct structures, no ornamentation; (2) ''premature:'' faintly pigmented, septa often thin, but sometimes beginning to thicken, other wall thickenings sometimes present, becoming reduced or remaining persistent, ornamentation barely visible; (3) ''mature:'' pigmentation obvious, septum and wall structures distinct, ornamentation well developed; (4) ''overmature''. pigmentation darkening, spore structures like ornamentation often becoming more pronounced but sometimes disintegrating, wall thickenings frequently becoming reduced again. In [[ascospore]]s that form septa two ontogenies have been described: ''A-ontogeny:'' early septum formation; [[spore septa]] form in immature spores even before other structures like [[apically]] thickenings become visible or before the spore becomes pigmented. ''B-ontogeny:'' [[late septum formation]]; spore septa form in premature or mature spores, i. e., after apical thickenings become visible or after the spore becomes pigmented.