Comparative meiotic studies in Triatoma sordida (Stal) and T. guasayana Wygodzinsky & Abalos (Reduviidae, Heteroptera)
Mem. Inst. Oswaldo Cruz
;
93(3): 309-15, May-Jun. 1998. ilus, tab, graf
Artículo
en Inglés
| LILACS
| ID: lil-209948
RESUMO
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 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 variatons through the gain or loss of heterochromatin can not be considered as a primary mechanism of reproductive isolation in Triatoma.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Triatoma
/
Meiosis
Límite:
Animales
País/Región como asunto:
America del Sur
/
Argentina
/
Brasil
Idioma:
Inglés
Revista:
Mem. Inst. Oswaldo Cruz
Asunto de la revista:
Medicina Tropical
/
Parasitología
Año:
1998
Tipo del documento:
Artículo
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