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
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/84889

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network_name_str SEDICI (UNLP)
spelling 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
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info:eu-repo/semantics/altIdentifier/doi/10.14411/eje.2001.026
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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
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rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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