Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae)
- Autores
- Bressa, María José; Papeschi, Alba G.; Mola, L.; Larramendy, Marcelo Luis
- Año de publicación
- 2001
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- So far, available cytogenetic data on 24 species of Rhopalidae reveal a male diploid chromosome number of 13, with a pair of m chromosomes and an XO/XX (male/female) sex chromosome determining system. As a rule Heteroptera have holokinetic chromosomes and a pre-reductional type of meiosis: the autosomal bivalents and the m pseudobivalent segregate reductionally at first meiotic division, while the X chromosome segregates equationally. In the present study, the meiotic chromosome behaviour was analyzed in males from different Argentinean populations of Jadera haematoloma and J. sanguinolenta. Our results corroborate the diploid chromosome number and general patterns of male meiosis previously reported by other authors in samples from Brazil and Texas (USA). Among bivalents, one is remarkably larger and may present one or two terminal chiasmata. Comparison of mean chiasma frequency between Jadera haematoloma (5.63) and J. sanguinolenta (5.14) revealed that differences are significant. In most individuals of both species the largest pair appears as univalents in a variable number of cells and shows a regular meiotic segregation. Autosomal univalents orientate axially at metaphase I (with their long axis parallel to the spindle axis) and segregate equationally at anaphase I. At metaphase II they associate end-to-end forming a pseudobivalent that segregates reductionally at anaphase II. An hypothesis is suggested to explain the appearance of the largest pair, either as a ring/rod bivalent or as univalents within the same individual, although an asynaptic or desynaptic origin of the univalents cannot be ascertained. The highly regular meiotic behaviour of this autosomal pair could ensure a high fertility of the individuals, and could be considered a selectively neutral condition or, at least, not detrimental.
Facultad de Ciencias Naturales y Museo - Materia
-
Ciencias Naturales
Jadera haematoloma
Jadera sanguinolenta - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/84889
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Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae)Bressa, María JoséPapeschi, Alba G.Mola, L.Larramendy, Marcelo LuisCiencias NaturalesJadera haematolomaJadera sanguinolentaSo far, available cytogenetic data on 24 species of Rhopalidae reveal a male diploid chromosome number of 13, with a pair of m chromosomes and an XO/XX (male/female) sex chromosome determining system. As a rule Heteroptera have holokinetic chromosomes and a pre-reductional type of meiosis: the autosomal bivalents and the m pseudobivalent segregate reductionally at first meiotic division, while the X chromosome segregates equationally. In the present study, the meiotic chromosome behaviour was analyzed in males from different Argentinean populations of <i>Jadera haematoloma</i> and <i>J. sanguinolenta</i>. Our results corroborate the diploid chromosome number and general patterns of male meiosis previously reported by other authors in samples from Brazil and Texas (USA). Among bivalents, one is remarkably larger and may present one or two terminal chiasmata. Comparison of mean chiasma frequency between <i>Jadera haematoloma</i> (5.63) and <i>J. sanguinolenta</i> (5.14) revealed that differences are significant. In most individuals of both species the largest pair appears as univalents in a variable number of cells and shows a regular meiotic segregation. Autosomal univalents orientate axially at metaphase I (with their long axis parallel to the spindle axis) and segregate equationally at anaphase I. At metaphase II they associate end-to-end forming a pseudobivalent that segregates reductionally at anaphase II. An hypothesis is suggested to explain the appearance of the largest pair, either as a ring/rod bivalent or as univalents within the same individual, although an asynaptic or desynaptic origin of the univalents cannot be ascertained. The highly regular meiotic behaviour of this autosomal pair could ensure a high fertility of the individuals, and could be considered a selectively neutral condition or, at least, not detrimental.Facultad de Ciencias Naturales y Museo2001info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf151-157http://sedici.unlp.edu.ar/handle/10915/84889enginfo:eu-repo/semantics/altIdentifier/issn/1210-5759info:eu-repo/semantics/altIdentifier/doi/10.14411/eje.2001.026info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:19Zoai:sedici.unlp.edu.ar:10915/84889Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:20.121SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae) |
title |
Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae) |
spellingShingle |
Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae) Bressa, María José Ciencias Naturales Jadera haematoloma Jadera sanguinolenta |
title_short |
Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae) |
title_full |
Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae) |
title_fullStr |
Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae) |
title_full_unstemmed |
Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae) |
title_sort |
Autosomal univalents as a common meiotic feature in Jadera haematoloma and Jadera sanguinolenta (Heteroptera: Rhopalidae: Serinethinae) |
dc.creator.none.fl_str_mv |
Bressa, María José Papeschi, Alba G. Mola, L. Larramendy, Marcelo Luis |
author |
Bressa, María José |
author_facet |
Bressa, María José Papeschi, Alba G. Mola, L. Larramendy, Marcelo Luis |
author_role |
author |
author2 |
Papeschi, Alba G. Mola, L. Larramendy, Marcelo Luis |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Ciencias Naturales Jadera haematoloma Jadera sanguinolenta |
topic |
Ciencias Naturales Jadera haematoloma Jadera sanguinolenta |
dc.description.none.fl_txt_mv |
So far, available cytogenetic data on 24 species of Rhopalidae reveal a male diploid chromosome number of 13, with a pair of m chromosomes and an XO/XX (male/female) sex chromosome determining system. As a rule Heteroptera have holokinetic chromosomes and a pre-reductional type of meiosis: the autosomal bivalents and the m pseudobivalent segregate reductionally at first meiotic division, while the X chromosome segregates equationally. In the present study, the meiotic chromosome behaviour was analyzed in males from different Argentinean populations of <i>Jadera haematoloma</i> and <i>J. sanguinolenta</i>. Our results corroborate the diploid chromosome number and general patterns of male meiosis previously reported by other authors in samples from Brazil and Texas (USA). Among bivalents, one is remarkably larger and may present one or two terminal chiasmata. Comparison of mean chiasma frequency between <i>Jadera haematoloma</i> (5.63) and <i>J. sanguinolenta</i> (5.14) revealed that differences are significant. In most individuals of both species the largest pair appears as univalents in a variable number of cells and shows a regular meiotic segregation. Autosomal univalents orientate axially at metaphase I (with their long axis parallel to the spindle axis) and segregate equationally at anaphase I. At metaphase II they associate end-to-end forming a pseudobivalent that segregates reductionally at anaphase II. An hypothesis is suggested to explain the appearance of the largest pair, either as a ring/rod bivalent or as univalents within the same individual, although an asynaptic or desynaptic origin of the univalents cannot be ascertained. The highly regular meiotic behaviour of this autosomal pair could ensure a high fertility of the individuals, and could be considered a selectively neutral condition or, at least, not detrimental. Facultad de Ciencias Naturales y Museo |
description |
So far, available cytogenetic data on 24 species of Rhopalidae reveal a male diploid chromosome number of 13, with a pair of m chromosomes and an XO/XX (male/female) sex chromosome determining system. As a rule Heteroptera have holokinetic chromosomes and a pre-reductional type of meiosis: the autosomal bivalents and the m pseudobivalent segregate reductionally at first meiotic division, while the X chromosome segregates equationally. In the present study, the meiotic chromosome behaviour was analyzed in males from different Argentinean populations of <i>Jadera haematoloma</i> and <i>J. sanguinolenta</i>. Our results corroborate the diploid chromosome number and general patterns of male meiosis previously reported by other authors in samples from Brazil and Texas (USA). Among bivalents, one is remarkably larger and may present one or two terminal chiasmata. Comparison of mean chiasma frequency between <i>Jadera haematoloma</i> (5.63) and <i>J. sanguinolenta</i> (5.14) revealed that differences are significant. In most individuals of both species the largest pair appears as univalents in a variable number of cells and shows a regular meiotic segregation. Autosomal univalents orientate axially at metaphase I (with their long axis parallel to the spindle axis) and segregate equationally at anaphase I. At metaphase II they associate end-to-end forming a pseudobivalent that segregates reductionally at anaphase II. An hypothesis is suggested to explain the appearance of the largest pair, either as a ring/rod bivalent or as univalents within the same individual, although an asynaptic or desynaptic origin of the univalents cannot be ascertained. The highly regular meiotic behaviour of this autosomal pair could ensure a high fertility of the individuals, and could be considered a selectively neutral condition or, at least, not detrimental. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/84889 |
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http://sedici.unlp.edu.ar/handle/10915/84889 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/1210-5759 info:eu-repo/semantics/altIdentifier/doi/10.14411/eje.2001.026 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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