Male meiosis in polyploid silkworms,Bombyx mori L. (Lepidoptera : Bombycidae) |
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Institution: | 1. Molekulare Evolutionsbiologie, Institut für Zoologie, Universität Hamburg, Martin-Luther-King Platz 3, 20146 Hamburg, Germany;2. Zentrum für Molekulare Biodiversitätsforschung, Zoologisches Forschungsmuseum Alexander Koenig, 53113 Bonn, Germany |
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Abstract: | Tetraploid and hexaploid silkworms, Bombyx mori L. (Lepidoptera Bombycidae) were induced by applying a cold shock to diploid and triploid eggs at the first cleavage stage. Male meiosis in the primary spermatocytes of these silkworms having a different ploidy was observed. In the polyploid cells, chromosome bridges, 2 for the tetraploid and 3 for the hexaploid, occurred between the newly formed daughter nuclei at telophase. Observation in the living spermatocytes showed that tetraploid cells needed a longer time than the diploid ones to complete the first meiotic division. The delay in the cell division may be responsible for the high sterility of the tetraploid males. |
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