Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina
- Autores
- López, Mariana G.; Wulff, Arturo F.; Poggio, Lidia; Xifreda, Cecilia Carmen
- Año de publicación
- 2005
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Meiotic chromosome counts, chromosomal behaviour and meiotic configurations of ten taxa of Senecio from Argentina were examined. Most counts are original: S. crepidifolius DC., S. francisci Phil. and S. octolepis Griseb. var. saltensis (Hicken) Cabrera & Zardini have 2n = 40, and S. chrysolepis Phil., 2n = 80 + 8B. We confirmed previous reports for S. deferens Griseb. (2n = 40 + 4B), S. filaginoides DC. var. filaginoides (2n = 40), S. hieronymi Griseb. (2n = 40 + 7B), S. pampeanus Cabrera (2n = 40) and S. rudbeckiifolius Meyen & Walp. (2n = 40 + 7B). In S. bracteolatus Hook. & Arn. var. bracteolatus, we found a new number (2n = 40) that differs from the one cited previously. In four species, numerical polymorphisms for B-chromosomes were observed. Several of the analysed species presented secondary bivalent association. This phenomenon, together with other evidence, supports x = 5 as the basic chromosome number. The number of chiasmata and their positions were also surveyed, with the finding that open bivalents were the most frequent meiotic figures and terminal chiasmata the preferential position. These features are related to recombination rate, and the success and persistence of these polyploids. We discuss some systematic and evolutionary aspects in the light of cytogenetic data and conclude that polyploidy is the major force modelling the chromosome evolution within this genus.
Laboratorio de Etnobotánica y Botánica Aplicada - Materia
-
Botánica
Basic chromosome number
Bivalent structure
Polyploidy
Recombination
Secondary association
Secondary cycle of polyploidy - 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:10915/137561
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Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from ArgentinaLópez, Mariana G.Wulff, Arturo F.Poggio, LidiaXifreda, Cecilia CarmenBotánicaBasic chromosome numberBivalent structurePolyploidyRecombinationSecondary associationSecondary cycle of polyploidyMeiotic chromosome counts, chromosomal behaviour and meiotic configurations of ten taxa of Senecio from Argentina were examined. Most counts are original: S. crepidifolius DC., S. francisci Phil. and S. octolepis Griseb. var. saltensis (Hicken) Cabrera & Zardini have 2n = 40, and S. chrysolepis Phil., 2n = 80 + 8B. We confirmed previous reports for S. deferens Griseb. (2n = 40 + 4B), S. filaginoides DC. var. filaginoides (2n = 40), S. hieronymi Griseb. (2n = 40 + 7B), S. pampeanus Cabrera (2n = 40) and S. rudbeckiifolius Meyen & Walp. (2n = 40 + 7B). In S. bracteolatus Hook. & Arn. var. bracteolatus, we found a new number (2n = 40) that differs from the one cited previously. In four species, numerical polymorphisms for B-chromosomes were observed. Several of the analysed species presented secondary bivalent association. This phenomenon, together with other evidence, supports x = 5 as the basic chromosome number. The number of chiasmata and their positions were also surveyed, with the finding that open bivalents were the most frequent meiotic figures and terminal chiasmata the preferential position. These features are related to recombination rate, and the success and persistence of these polyploids. We discuss some systematic and evolutionary aspects in the light of cytogenetic data and conclude that polyploidy is the major force modelling the chromosome evolution within this genus. Laboratorio de Etnobotánica y Botánica Aplicada2005info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf465-474http://sedici.unlp.edu.ar/handle/10915/137561enginfo:eu-repo/semantics/altIdentifier/issn/1095-8339info:eu-repo/semantics/altIdentifier/issn/0024-4074info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1095-8339.2005.00415.xinfo: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:UNLP2025-10-15T11:24:14Zoai:sedici.unlp.edu.ar:10915/137561Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-15 11:24:15.125SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina |
title |
Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina |
spellingShingle |
Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina López, Mariana G. Botánica Basic chromosome number Bivalent structure Polyploidy Recombination Secondary association Secondary cycle of polyploidy |
title_short |
Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina |
title_full |
Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina |
title_fullStr |
Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina |
title_full_unstemmed |
Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina |
title_sort |
Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina |
dc.creator.none.fl_str_mv |
López, Mariana G. Wulff, Arturo F. Poggio, Lidia Xifreda, Cecilia Carmen |
author |
López, Mariana G. |
author_facet |
López, Mariana G. Wulff, Arturo F. Poggio, Lidia Xifreda, Cecilia Carmen |
author_role |
author |
author2 |
Wulff, Arturo F. Poggio, Lidia Xifreda, Cecilia Carmen |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Botánica Basic chromosome number Bivalent structure Polyploidy Recombination Secondary association Secondary cycle of polyploidy |
topic |
Botánica Basic chromosome number Bivalent structure Polyploidy Recombination Secondary association Secondary cycle of polyploidy |
dc.description.none.fl_txt_mv |
Meiotic chromosome counts, chromosomal behaviour and meiotic configurations of ten taxa of Senecio from Argentina were examined. Most counts are original: S. crepidifolius DC., S. francisci Phil. and S. octolepis Griseb. var. saltensis (Hicken) Cabrera & Zardini have 2n = 40, and S. chrysolepis Phil., 2n = 80 + 8B. We confirmed previous reports for S. deferens Griseb. (2n = 40 + 4B), S. filaginoides DC. var. filaginoides (2n = 40), S. hieronymi Griseb. (2n = 40 + 7B), S. pampeanus Cabrera (2n = 40) and S. rudbeckiifolius Meyen & Walp. (2n = 40 + 7B). In S. bracteolatus Hook. & Arn. var. bracteolatus, we found a new number (2n = 40) that differs from the one cited previously. In four species, numerical polymorphisms for B-chromosomes were observed. Several of the analysed species presented secondary bivalent association. This phenomenon, together with other evidence, supports x = 5 as the basic chromosome number. The number of chiasmata and their positions were also surveyed, with the finding that open bivalents were the most frequent meiotic figures and terminal chiasmata the preferential position. These features are related to recombination rate, and the success and persistence of these polyploids. We discuss some systematic and evolutionary aspects in the light of cytogenetic data and conclude that polyploidy is the major force modelling the chromosome evolution within this genus. Laboratorio de Etnobotánica y Botánica Aplicada |
description |
Meiotic chromosome counts, chromosomal behaviour and meiotic configurations of ten taxa of Senecio from Argentina were examined. Most counts are original: S. crepidifolius DC., S. francisci Phil. and S. octolepis Griseb. var. saltensis (Hicken) Cabrera & Zardini have 2n = 40, and S. chrysolepis Phil., 2n = 80 + 8B. We confirmed previous reports for S. deferens Griseb. (2n = 40 + 4B), S. filaginoides DC. var. filaginoides (2n = 40), S. hieronymi Griseb. (2n = 40 + 7B), S. pampeanus Cabrera (2n = 40) and S. rudbeckiifolius Meyen & Walp. (2n = 40 + 7B). In S. bracteolatus Hook. & Arn. var. bracteolatus, we found a new number (2n = 40) that differs from the one cited previously. In four species, numerical polymorphisms for B-chromosomes were observed. Several of the analysed species presented secondary bivalent association. This phenomenon, together with other evidence, supports x = 5 as the basic chromosome number. The number of chiasmata and their positions were also surveyed, with the finding that open bivalents were the most frequent meiotic figures and terminal chiasmata the preferential position. These features are related to recombination rate, and the success and persistence of these polyploids. We discuss some systematic and evolutionary aspects in the light of cytogenetic data and conclude that polyploidy is the major force modelling the chromosome evolution within this genus. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005 |
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/10915/137561 |
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http://sedici.unlp.edu.ar/handle/10915/137561 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
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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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