Cytological evidence on the ability of the nucleolus organizing regions to assemble pre-existing nucleolar material |
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Authors: | S Sato |
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Institution: | (1) Department of Biology, Faculty of Science, Ehime University, Bunkyo-cho 2-5, 790 Matsuyama, Ehime, (Japan) |
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Abstract: | Summary The treatment ofVicia faba root tips with 5-azacytidine caused unequal allotment of the chromosomes; after one cell cycle, a pair of daughter nuclei was produced, one of which carried the nucleolus organizing regions (NORs) and the other of which lacked them. The pre-existing nucleolar material brought into the NOR-carrying daughter nucleus by the chromosomes disappeared concurrently with the appearance of the new nucleoli, whereas in another daughter nucleus without the NOR a number of small nucleolus-like bodies became visible at random positions. These findings suggest that in addition to ribosomal RNA synthesis the NOR has another role in cells; to stimulate the pre-existing nucleolar material to assemble at the NOR itself. |
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Keywords: | 5-Azacytidine nucleous organizing region prenucleolar material silver staining Vicia faba |
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