Nucleic acid synthesis during and after mitosis in the slime mold, Physarum polycephalum |
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| Authors: | D Kessler |
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| Affiliation: | 1. Department of Computer Science/Institute for Life Sciences, University of Southampton, Highfield, Southampton, SO17 1BJ, UK;2. The Parmenides Foundation, Kirchplatz 1, 82049, Pullach/Munich, Germany;3. MTA-ELTE Theoretical Biology and Evolutionary Ecology Research Group, Pázmány Péter sétány 1C, Budapest 1117, Hungary;1. UMR5164, University of Bordeaux, 146 Rue Léo Saignat, Bordeaux 33076, France;2. Biosciences, University of Exeter, Exeter, EX4 4QD, UK;3. Institut de Biologia Evolutiva (CSIC-Universitat Pompeu Fabra), Passeig Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain;4. Departament de Genètica, Universitat de Barcelona, 08028 Barcelona, Spain;5. Institució Catalana de Recerca i Estudis Avançats, Pg Lluis Companys 23, 08010 Barcelona, Spain;1. Faculty of Law, Humanities and the Arts, University of Wollongong, Australia;2. Minimal Intelligence Lab (MINT Lab), Universidad de Murcia, Spain;1. Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic;2. Department of Biology, University of Florence, Sesto Fiorentino, Italy |
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| Abstract: | During metaphase and anaphase in the plasmodium of Physarum polycephalum, incorporation of radioactivity into nuclear RNA cannot be demonstrated by autoradiography after 5 min incubations in 3H-uridine at high concentration. However, a low but still discernible level of labeling is seen over nuclei after 10 min incubations starting during mitosis. It is concluded that the rate of RNA synthesis in the nuclei declines to a level not detected by autoradiography for a period of about 5 min but less than 10 min during mitosis.Nuclear DNA and RNA synthesis are shown to start together within 5 min immediately after anaphase; thus a G1 period between anaphase and the start of nuclear DNA synthesis is not demonstrable autoradiographically in the plasmodium of Physarum polycephalum. |
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