Meiotic differences between three triatomine species (Hemiptera,Reduviidae) |
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Authors: | E S De Vaio B Grucci A M Castagnino M E Franca M E Martínez |
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Institution: | (1) Dpto. de Genética, Instituto de Biociencias, Facultad de Humanidades y Ciencias, Tristán Narvaja, 1674 Montevideo, Uruguay;(2) Instituto de Higiene, Facultad de Medicina, A. Navarro, 3051 A. NavarroMontevideo, Uruguay |
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Abstract: | We have found the following differences in the male meiosis among three triatomine species: (1) The three largest autosomal
bivalents ofTriatoma infestans are heterochromatic.Rhodnius prolixus has two autosomal bivalents with heterochromatic blocks.Triatoma rubrovaria does not show any heteropycnotic autosomes. (2) Sex chromosomes inT. infestans form a chromocenter. At early prophase terminal associations are seen between sex chromosomes inT. rubrovaria, and they maintain a close association until diakinesis. An intimate association between the X and Y chromosomes is observed
during early prophase inR. prolixus, but a distant association is maintained by the sex chromosomes at diffuse and diplotene stages in this species. (3) Polyploid
nuclei of the nutritive cells are quite distinct. Numerous chromocenters of different shapes and sized are seen in those ofT. infestans. InT. rubrovaria one chromocenter having two positively heteropycnotic elements is observed surrounded by homogeneous chromatin. Only one
compact chromocenter is found amongst unevenly distributed chromatin, inR. prolixus. |
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