Patterns of activity of nucleolar organizer regions during spermatogenesis and oogenesis in Kalotermes flavicollis Fabr. (Insecta : Isoptera) analyzed by silver staining

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...

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Bibliographic Details
Published in:Genetica 1990-01, Vol.82 (1), p.11-15
Main Authors: FONTANA, F, GOLDONI, D, BERGAMINI, M
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Cytogenetics
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Invertebrata
Invertebrates
Isoptera
Kalotermes flavicollis
Kalotermitidae
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Summary: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.
ISSN:0016-6707
1573-6857
DOI:10.1007/BF00057668