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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 93, No. 3, 1998, pp. 309-315
Bioline Code: oc98060
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 93, No. 3, 1998, pp. 309-315

 en Comparative meiotic studies in Triatoma sordida (Stal) and T. guasayana Wygodzinsky & Abalos (Reduviidae, Heteroptera)
P Rebagliati; AG Papeschi; LM Mola; S Pietrokovsky; P Gajate; V Bottazzi & C Wisnivesky-Colli

Abstract

Triatoma sordida and T. guasayana are competent Trypanosoma
cruzi vectors, with overlapping distribution areas in Argentina. Both
species are morphologically similar, and their immature stages are hard to
discriminate. Cytogenetic studies in the genus Triatoma reveal
scarce karyotypic variations, being 2n= 20 + XY the most frequent diploid
number in males.  

In the present work the meiotic behaviour of different Argentinian populations of T. sordida and T. guasayana has been analyzed; the meiotic karyotype of both species has also been compared. The species differ in total chromosome area and in the relative area of the sex chromosomes. These meiotic karyotypic differences constitute an additional tool for the taxonomic characterization of T. sordida and T. guasayana. The analysis of an interpopulation hybrid of T. sordida (Brazil x Argentina) reveals a regular meiotic behaviour, despite the presence of heteromorphic bivalents. Our observations support the hypothesis that karyotype variations through the gain or loss of heterochromatin can not be considered as a primary mechanism of reproductive isolation in Triatoma.

Keywords
Triatoma - holokinetic chromosomes - Heteroptera - meiotic karyotype - meiotic behaviour

 
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