Local Degeneration of Cilia and Nuclear Activation during Sexual Reproduction in Paramecium caudatum. (degeneration of cilia/nuclear activation/conjugation/autogamy/Paramecium)
نویسندگان
چکیده
منابع مشابه
A scanning electron-microscopic study of the local degeneration of cilia during sexual reproduction in Paramecium.
The location and extent of local degeneration of cilia during sexual reproduction of Paramecium was studied using scanning electron microscopy to examine cells undergoing conjugation and autogamy. At some time during the mating reaction, but prior to conjugant pair formation, ciliary degeneration begins at the antero-ventral tip of cells and proceeds posteriorly along the suture. In the anterio...
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Correlation between cortical structures, such as the suture lines and the oral apparatus, and local degeneration of cilia during conjugation was investigated using aberrantly shaped cells which were produced by treating normal cells with 2 mM adenine for 24 h. Three types of aberrantly shaped cells were obtained: (1) proters, in which the oral apparatus is located at or near the posterior end o...
متن کاملIntracellular positional control of survival or degeneration of nuclei during conjugation in Paramecium caudatum.
The survival or degeneration of nuclei produced after meiosis in Paramecium caudatum depends upon their position in the cytoplasm. The surviving nucleus lies in the paroral region, which is the region around the cytostome. In this study, this was confirmed by quantitative measurements of the location of surviving nuclei in both stained and living conjugating cells. Observation of nuclear behavi...
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The energy supply for eukaryotic ciliary and flagellar movement is thought to be maintained by ATP-regenerating enzymes such as adenylate kinase, creatine kinase and arginine kinase. In this study, the energy-supplying system for the ciliary movement of Paramecium caudatum was examined. Arginine kinase and adenylate kinase activities were detected in the cilia. To demonstrate that phosphoargini...
متن کاملMating-reactive membrane vesicles from cilia of Paramecium caudatum
Membrane vesicles with a high mating reactivity were obtained from cilia of Paramecium caudatum by treatment with a solution containing 2 M urea and 0.1 mM Na2-EDTA. All processes of conjugation were induced in cells of the complementary mating type by approximately 10 mug/ml proteins of the vesicles. Electron microscope observation showed that the membrane vesicles have a diameter of 100-150 n...
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ژورنال
عنوان ژورنال: Development, Growth and Differentiation
سال: 1983
ISSN: 0012-1592,1440-169X
DOI: 10.1111/j.1440-169x.1983.00113.x