Patterns of activity of nucleolar organizer regions during spermatogenesis and oogenesis inKalotermes flavicollisFabr. (Insecta: Isoptera) analyzed by silver staining
✍ Scribed by F. Fontana; D. Goldoni; M. Bergamini
- Publisher
- Springer Netherlands
- Year
- 1990
- Tongue
- English
- Weight
- 360 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0016-6707
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✦ Synopsis
The distribution and the behaviour of the nucleolus organizer regions (NORs) were analysed during the spermatogenesis and oogenesis of K. flavicollis with the silver staining method. The Ag-stainability of the NORs increases in growing spermatocytes up to pachytene and is absent during the remainder of the meiotic prophase. During female meiosis the nucleolar material undergoes a more complex transformation. It is active until pachytene; in early diplotene the mass of silver stainable material progressively increases as an effect of rDNA amplification. By the end of meiotic prophase the nucleolar strands disappear and a large nucleolus is rebuilt in the mature oocyte.