Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)

Autores
Lopez, Marina G.; Xifreda, Cecilia Carmen; Poggio, Lidia; Wulff, Arturo F.
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Background: Senecio is the largest genus in the Asteraceae family growing in all environments around the world. It displays taxonomic and systematical difficulties. Cytogenetic knowledge of this genus is ancient, scarce and mainly restricted to chromosome number records. Results: In this study we analyzed chromosome number, meiotic configuration, bivalent morphology, meiotic behavior and pollen grain stainability on 100 accessions of 27 different polyploid Senecio L. sect Senecio entities. Median, standard deviation and mode were calculated for number and position of chiasmata and meiotic recombination was statistically evaluated. Although high frequency of multivalents and associated meiotic irregularities are expected in high polyploids, bivalents predominance and, consequently, regular meiosis were observed, with normal sporogenesis and high pollen grain stainability. Conclusion: Depletion in the total chiasmata was significant only in some species but the terminal position was preferential in all the entities analyzed, indicating significant reduction in recombination. The regular meiosis observed suggest that intra and intergenomic reorganization process occur quickly and efficiently in this genus. Mechanisms of diploidization, common to all polyploids, are reinforced by the strong reduction in crossing-over rushing polyploids stabilization.
Facultad de Ciencias Naturales y Museo
Materia
Biología
Chiasmata
Chromosome number
Cytogenetics
Meiotic analysis
Meiotic recombination
Senecio
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:10915/85503
Acceder
id SEDICI_18c004cca58ef73a16634fe1ad1cc41f
oai_identifier_str oai:sedici.unlp.edu.ar:10915/85503
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)Lopez, Marina G.Xifreda, Cecilia CarmenPoggio, LidiaWulff, Arturo F.BiologíaChiasmataChromosome numberCytogeneticsMeiotic analysisMeiotic recombinationSenecioBackground: Senecio is the largest genus in the Asteraceae family growing in all environments around the world. It displays taxonomic and systematical difficulties. Cytogenetic knowledge of this genus is ancient, scarce and mainly restricted to chromosome number records. Results: In this study we analyzed chromosome number, meiotic configuration, bivalent morphology, meiotic behavior and pollen grain stainability on 100 accessions of 27 different polyploid Senecio L. sect Senecio entities. Median, standard deviation and mode were calculated for number and position of chiasmata and meiotic recombination was statistically evaluated. Although high frequency of multivalents and associated meiotic irregularities are expected in high polyploids, bivalents predominance and, consequently, regular meiosis were observed, with normal sporogenesis and high pollen grain stainability. Conclusion: Depletion in the total chiasmata was significant only in some species but the terminal position was preferential in all the entities analyzed, indicating significant reduction in recombination. The regular meiosis observed suggest that intra and intergenomic reorganization process occur quickly and efficiently in this genus. Mechanisms of diploidization, common to all polyploids, are reinforced by the strong reduction in crossing-over rushing polyploids stabilization.Facultad de Ciencias Naturales y Museo2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/85503enginfo:eu-repo/semantics/altIdentifier/issn/1817-406Xinfo:eu-repo/semantics/altIdentifier/doi/10.1186/1999-3110-54-20info: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:UNLP2025-09-03T10:48:46Zoai:sedici.unlp.edu.ar:10915/85503Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 10:48:47.002SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
title Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
spellingShingle Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
Lopez, Marina G.
Biología
Chiasmata
Chromosome number
Cytogenetics
Meiotic analysis
Meiotic recombination
Senecio
title_short Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
title_full Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
title_fullStr Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
title_full_unstemmed Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
title_sort Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
dc.creator.none.fl_str_mv Lopez, Marina G.
Xifreda, Cecilia Carmen
Poggio, Lidia
Wulff, Arturo F.
author Lopez, Marina G.
author_facet Lopez, Marina G.
Xifreda, Cecilia Carmen
Poggio, Lidia
Wulff, Arturo F.
author_role author
author2 Xifreda, Cecilia Carmen
Poggio, Lidia
Wulff, Arturo F.
author2_role author
author
author
dc.subject.none.fl_str_mv Biología
Chiasmata
Chromosome number
Cytogenetics
Meiotic analysis
Meiotic recombination
Senecio
topic Biología
Chiasmata
Chromosome number
Cytogenetics
Meiotic analysis
Meiotic recombination
Senecio
dc.description.none.fl_txt_mv Background: Senecio is the largest genus in the Asteraceae family growing in all environments around the world. It displays taxonomic and systematical difficulties. Cytogenetic knowledge of this genus is ancient, scarce and mainly restricted to chromosome number records. Results: In this study we analyzed chromosome number, meiotic configuration, bivalent morphology, meiotic behavior and pollen grain stainability on 100 accessions of 27 different polyploid Senecio L. sect Senecio entities. Median, standard deviation and mode were calculated for number and position of chiasmata and meiotic recombination was statistically evaluated. Although high frequency of multivalents and associated meiotic irregularities are expected in high polyploids, bivalents predominance and, consequently, regular meiosis were observed, with normal sporogenesis and high pollen grain stainability. Conclusion: Depletion in the total chiasmata was significant only in some species but the terminal position was preferential in all the entities analyzed, indicating significant reduction in recombination. The regular meiosis observed suggest that intra and intergenomic reorganization process occur quickly and efficiently in this genus. Mechanisms of diploidization, common to all polyploids, are reinforced by the strong reduction in crossing-over rushing polyploids stabilization.
Facultad de Ciencias Naturales y Museo
description Background: Senecio is the largest genus in the Asteraceae family growing in all environments around the world. It displays taxonomic and systematical difficulties. Cytogenetic knowledge of this genus is ancient, scarce and mainly restricted to chromosome number records. Results: In this study we analyzed chromosome number, meiotic configuration, bivalent morphology, meiotic behavior and pollen grain stainability on 100 accessions of 27 different polyploid Senecio L. sect Senecio entities. Median, standard deviation and mode were calculated for number and position of chiasmata and meiotic recombination was statistically evaluated. Although high frequency of multivalents and associated meiotic irregularities are expected in high polyploids, bivalents predominance and, consequently, regular meiosis were observed, with normal sporogenesis and high pollen grain stainability. Conclusion: Depletion in the total chiasmata was significant only in some species but the terminal position was preferential in all the entities analyzed, indicating significant reduction in recombination. The regular meiosis observed suggest that intra and intergenomic reorganization process occur quickly and efficiently in this genus. Mechanisms of diploidization, common to all polyploids, are reinforced by the strong reduction in crossing-over rushing polyploids stabilization.
publishDate 2013
dc.date.none.fl_str_mv 2013
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/10915/85503
url http://sedici.unlp.edu.ar/handle/10915/85503
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1817-406X
info:eu-repo/semantics/altIdentifier/doi/10.1186/1999-3110-54-20
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)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.13397

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