Attheya decora (Centrales) - Geschlechtliche Fortpflanzung

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Formal Metadata

Title
Attheya decora (Centrales) - Geschlechtliche Fortpflanzung
Alternative Title
Attheya decora (Centrales) - Sexual Reproduction
Author
License
CC Attribution - NoDerivatives 3.0 Germany:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
Identifiers
IWF Signature
E 2383
Publisher
Release Date
1976
Language
German
Producer
IWF (Göttingen)

Technical Metadata

IWF Technical Data
Film, 16 mm, LT, 103 m ; SW, 9 1/2 min

Content Metadata

Subject Area
Abstract
Zentrische Diatomee; Oogamie. Aus männlich determinierten Zellen gehen durch einige Differenzierungsteilungen Spermatogonien hervor. In diesen entwickeln sich je vier eingeißelige Spermien. Oogonien entstehen direkt aus vegetativen Zellen. Nach der Befruchtung schwellen die Zygoten zu Auxosporen an. Aus der Auxospore entwickelt sich die Erstlingszelle.
The centric diatom Attheya decora reproduces sexually by oogamy. The monoecious clones produce sperms as well as eggs. Spermatogonia arise from male determined cells by a few differentiating mitosis. By two meiotic nuclear and cell divisions four uniflagellate sperm cells are formed within a spermatogonium. Oogonia develop directly from vegetative cells undergoing a considerable lengthening of the cell. The first of both nuclear divisions is accompanied by a cytokinesis, resulting in two egg cells per oogonium. After fertilization the zygotes are transformed into auxospores by swelling. From the auxospore the initial cell is formed by two consecutive metagamic mitosis with subsequent secretion of two thecae.
Keywords Attheya decora Auxosporen Oogamie Fortpflanzung, geschlechtliche / Chrysophyceae reproduction, sexual / Chrysophyceae oogamy auxospores Attheya decora diatom Encyclopaedia Cinematographica

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