Nucleolar size in parallel with ribosomal RNA synthesis in diapause termination in the eggs of Bombyx mori

The eggs of Bombyx mori, both in diapause and nondiapause, were subjected to cytological examination of nucleoli and measurement of RNA precursor incorporation (2 hours) into ribosomal RNA. In diapause eggs, the nucleoli were very small and the rate of ribosomal RNA synthesis was the lowest of the s...

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Bibliographic Details
Published in:Chromosoma 1978-01, Vol.68 (4), p.313-317
Main Authors: Kurata, S, Koga, K, Sakaguchi, B. (Kyushu Univ., Fukuoka (Japan). Sericulture Lab.)
Format: Article
Language:English
Subjects:
Animals
Bombyx
Cell Nucleolus - ultrastructure
Embryo, Nonmammalian - cytology
Embryo, Nonmammalian - metabolism
RNA, Ribosomal - biosynthesis
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Summary:The eggs of Bombyx mori, both in diapause and nondiapause, were subjected to cytological examination of nucleoli and measurement of RNA precursor incorporation (2 hours) into ribosomal RNA. In diapause eggs, the nucleoli were very small and the rate of ribosomal RNA synthesis was the lowest of the samples tested. Most cells in diapause possessed nuclei with one nucleolus. In contrast, the eggs activated from diapause by long chilling attained the largest size of nucleoli and the highest rate of ribosomal RNA synthesis. A significant proportion of the cell nuclei still had only one nucleolus at this stage. Three days after activation, the eggs exhibited intermediate levels in both the size of nucleoli and the rate of ribosomal RNA sythesis. At this stage, about half of the egg cell nuclei had two nucleoli.
ISSN:0009-5915
1432-0886
DOI:10.1007/BF00327166