Chaetoceros teres (Centrales) - Ungeschlechtliche Fortpflanzung, Zellteilung, Dauersporen

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Chaetoceros teres (Centrales) - Ungeschlechtliche Fortpflanzung, Zellteilung, Dauersporen
Alternative Title
Chaetoceros teres (Centrales) - Asexual Reproduction, Cell Division, Perennial Spores
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E 2011
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Silent film
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Kieselalge. Zusammenhalten der linearen Zellketten durch Borsten, vegetative Vermehrung durch Zellteilung, Kolonieteilung nach Bildung besonderer Trennschalen mit Endborsten, Bildung von Dauersporen durch sukzessive Abscheidung zweier Sporenvalven, Bildung der vegetativen Valven mit Endborsten. Mit Zeitraffung.
The centric planktonic diatom Chaetoceros teres produces linear chains of cells held together by lateral bristles. Vegetative multiplication follows by bipartion of the cells. After cell division the bristles grow out from the apices of the new valves. The bristles cross each other in pairs and fuse inseparably at their crossing points. Colony division happens, if special separating valves with terminal bristles are formed after cell division. Resting spores develop endogenously by successive secretion of two spore valves. The spore valves are formed acytokinetically (rudimentary cell divisions). At germination the spore valves are shedded and likewise acytokinetically substituted by vegetative valves with terminal bristles, giving rise to a one-celled colony. A two-celled colony develops, if during germination a normal cell division is intervening.
Keywords Algen / Kieselalge Kieselalge Chaetoceros teres Zellteilung / Chrysophyceae Fortpflanzung, ungeschlechtliche / Chrysophyceae Dauerspore perennial spore reproduction, asexual / Chrysophyceae Chaetoceros teres cell division / Chrysophyceae diatom