Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina

Autores
López, Mariana C.; Wulff, Arturo F.; Xifreda, Cecilia Carmen
Año de publicación
2002
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Meiotic chromosome numbers were determined and observations of meiotic behavior were made in six species and two hybrid specimens of Senecio L. (Asteraceae). Two different numbers were found: 2n=4x=40 in S. pogonias Cabr., S. ragonesei Cabr., S. sectilis Griseb. and S. viridis Phil. var. radiatus R. E. Fr. and 2n=8x=80 in S. subulatus D. Don. var. subulatus and in S. uspallatensis Hook. et Arn.; the latter showed the same chromosome number previously reported. The chromosome number of the hybrid individuals was 2n=4x=40, being their putative parents S. ragonesei and S. sectilis. B chromosomes were found in some individuals of S. pogonias, S. sectilis, S. subulatus var. subulatus and S. uspallatensis. Many meiotic irregularities such as bridges, fragments, laggard chromosomes, micronuclei and cellular fusion were observed. The results are analyzed in relation to the persistence and success of these polyploids, and the speciation mechanisms operating within this group are discussed.
Facultad de Ciencias Naturales y Museo
Materia
Botánica
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
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:10915/123765
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/123765
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network_name_str SEDICI (UNLP)
spelling Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from ArgentinaLópez, Mariana C.Wulff, Arturo F.Xifreda, Cecilia CarmenBotánicaB chromosomesCell fusionCytogeneticsMeiotic behaviorPolyploidySenecioMeiotic chromosome numbers were determined and observations of meiotic behavior were made in six species and two hybrid specimens of Senecio L. (Asteraceae). Two different numbers were found: 2n=4x=40 in S. pogonias Cabr., S. ragonesei Cabr., S. sectilis Griseb. and S. viridis Phil. var. radiatus R. E. Fr. and 2n=8x=80 in S. subulatus D. Don. var. subulatus and in S. uspallatensis Hook. et Arn.; the latter showed the same chromosome number previously reported. The chromosome number of the hybrid individuals was 2n=4x=40, being their putative parents S. ragonesei and S. sectilis. B chromosomes were found in some individuals of S. pogonias, S. sectilis, S. subulatus var. subulatus and S. uspallatensis. Many meiotic irregularities such as bridges, fragments, laggard chromosomes, micronuclei and cellular fusion were observed. The results are analyzed in relation to the persistence and success of these polyploids, and the speciation mechanisms operating within this group are discussed.Facultad de Ciencias Naturales y Museo2002info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf27-35http://sedici.unlp.edu.ar/handle/10915/123765enginfo:eu-repo/semantics/altIdentifier/issn/0008-7114info:eu-repo/semantics/altIdentifier/issn/2165-5391info:eu-repo/semantics/altIdentifier/doi/10.1080/00087114.2002.10589255info: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:UNLP2025-09-17T10:12:13Zoai:sedici.unlp.edu.ar:10915/123765Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-17 10:12:13.786SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
spellingShingle Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
López, Mariana C.
Botánica
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
title_short Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_full Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_fullStr Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_full_unstemmed Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_sort Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
dc.creator.none.fl_str_mv López, Mariana C.
Wulff, Arturo F.
Xifreda, Cecilia Carmen
author López, Mariana C.
author_facet López, Mariana C.
Wulff, Arturo F.
Xifreda, Cecilia Carmen
author_role author
author2 Wulff, Arturo F.
Xifreda, Cecilia Carmen
author2_role author
author
dc.subject.none.fl_str_mv Botánica
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
topic Botánica
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
dc.description.none.fl_txt_mv Meiotic chromosome numbers were determined and observations of meiotic behavior were made in six species and two hybrid specimens of Senecio L. (Asteraceae). Two different numbers were found: 2n=4x=40 in S. pogonias Cabr., S. ragonesei Cabr., S. sectilis Griseb. and S. viridis Phil. var. radiatus R. E. Fr. and 2n=8x=80 in S. subulatus D. Don. var. subulatus and in S. uspallatensis Hook. et Arn.; the latter showed the same chromosome number previously reported. The chromosome number of the hybrid individuals was 2n=4x=40, being their putative parents S. ragonesei and S. sectilis. B chromosomes were found in some individuals of S. pogonias, S. sectilis, S. subulatus var. subulatus and S. uspallatensis. Many meiotic irregularities such as bridges, fragments, laggard chromosomes, micronuclei and cellular fusion were observed. The results are analyzed in relation to the persistence and success of these polyploids, and the speciation mechanisms operating within this group are discussed.
Facultad de Ciencias Naturales y Museo
description Meiotic chromosome numbers were determined and observations of meiotic behavior were made in six species and two hybrid specimens of Senecio L. (Asteraceae). Two different numbers were found: 2n=4x=40 in S. pogonias Cabr., S. ragonesei Cabr., S. sectilis Griseb. and S. viridis Phil. var. radiatus R. E. Fr. and 2n=8x=80 in S. subulatus D. Don. var. subulatus and in S. uspallatensis Hook. et Arn.; the latter showed the same chromosome number previously reported. The chromosome number of the hybrid individuals was 2n=4x=40, being their putative parents S. ragonesei and S. sectilis. B chromosomes were found in some individuals of S. pogonias, S. sectilis, S. subulatus var. subulatus and S. uspallatensis. Many meiotic irregularities such as bridges, fragments, laggard chromosomes, micronuclei and cellular fusion were observed. The results are analyzed in relation to the persistence and success of these polyploids, and the speciation mechanisms operating within this group are discussed.
publishDate 2002
dc.date.none.fl_str_mv 2002
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/10915/123765
url http://sedici.unlp.edu.ar/handle/10915/123765
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0008-7114
info:eu-repo/semantics/altIdentifier/issn/2165-5391
info:eu-repo/semantics/altIdentifier/doi/10.1080/00087114.2002.10589255
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
27-35
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 13.001348

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