Patterns of nucleolar activity during spermatogenesis of two triatomines, Panstrongylus megistus and P-herreri
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Data
1999-07-01
Autores
Tartarotti, E.
Oliveira, Maria Tercília Vilela de Azeredo [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Univ Florence Botany Inst
Resumo
The present work analyzed spermatogenesis in two species of triatomines (genus Panstrongylus) using silver-ion impregnation. The sex chromosomes of P. megistus and P. herreri had nucleolar organizing activity and became strongly impregnated during the phases of meiotic prophase I. Fragmentation of the nucleolus occurred in both species during the meiotic cycle. The nucleolar region could be observed up to diakinesis in meiotic prophase after which only nucleolar bodies and fragments were seen. Postmeiotic reactivation of rRNA synthesis occurred in these two species and was probably related to cell differentiation.
Descrição
Palavras-chave
nucleolar persistence, nucleolus, Panstrongylus, spermatogenesis, triatomines
Como citar
Caryologia. Florence: Univ Florence Botany Inst, v. 52, n. 3-4, p. 177-184, 1999.