Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae) : I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera

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The genus Dysdercus Guerin Meneville 1831 represents the only taxon within the family Pyrrhocoridae in the New World. Based on morphological features, it has been suggested that American species derived from immigrants from the Old World, most probably from the Ethiopian Region. So far, 10 species f...

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Autores principales: Bressa, María José, Papeschi, Alba G., Mola, Liliana María, Larramendy, Marcelo Luis
Formato: Articulo
Lenguaje:Español
Publicado: 1999
Materias:
Biología
Ciencias Naturales
Dysdercus albofasciatus
Heteroptera
Holokinetic chromosomes
Neo-XY
Pyrrhocoridae
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/146102
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-146102
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Biología
Ciencias Naturales
Dysdercus albofasciatus
Heteroptera
Holokinetic chromosomes
Neo-XY
Pyrrhocoridae
spellingShingle Biología
Ciencias Naturales
Dysdercus albofasciatus
Heteroptera
Holokinetic chromosomes
Neo-XY
Pyrrhocoridae
Bressa, María José
Papeschi, Alba G.
Mola, Liliana María
Larramendy, Marcelo Luis
Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae) : I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera
topic_facet Biología
Ciencias Naturales
Dysdercus albofasciatus
Heteroptera
Holokinetic chromosomes
Neo-XY
Pyrrhocoridae
description The genus Dysdercus Guerin Meneville 1831 represents the only taxon within the family Pyrrhocoridae in the New World. Based on morphological features, it has been suggested that American species derived from immigrants from the Old World, most probably from the Ethiopian Region. So far, 10 species from Dysdercus, including six species from the Old World and four species from the Neotropical Region have been cytogenetically analyzed. As is characteristic of Heteroptera, they possess holokinetic chromosomes and a prereductional type of meiosis. While the X1X20 sex chromosome system has been reported in all cytologically analyzed species of Dysdercus from the Old World, the system X0 has been found in all but one species from the New World, regardless of the number of autosomes in the complement. In the present study the male meiosis of D. Albofasciatus Berg 1878 was studied in specimens from four different populations from Argentina. The diploid chromosome number was found to be 2n = 10 + neo-XY. The neo-X shows at each subterminal region a positively heteropycnotic and DAPI-bright segment which corresponds to the ancestral X-chromosome. The origin of this neo-XY system involved, most probably, a subterminal insertion of the ancestral X chromosome in an autosome, followed by a large inversion, which included part of the original X chromosome.
format Articulo
Articulo
author Bressa, María José
Papeschi, Alba G.
Mola, Liliana María
Larramendy, Marcelo Luis
author_facet Bressa, María José
Papeschi, Alba G.
Mola, Liliana María
Larramendy, Marcelo Luis
author_sort Bressa, María José
title Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae) : I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera
title_short Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae) : I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera
title_full Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae) : I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera
title_fullStr Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae) : I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera
title_full_unstemmed Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae) : I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera
title_sort meiotic studies in dysdercus guerin meneville 1831 (heteroptera: pyrrhocoridae) : i. neo-xy in dysdercus albofasciatus berg 1878, a new sex chromosome determining system in heteroptera
publishDate 1999
url http://sedici.unlp.edu.ar/handle/10915/146102
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