Chromosomic numbers for three species of Cosmos section Discopoda (Asteraceae, Coreopsideae), with cytogeographic notes
Background and Aims: Cosmos section Discopoda (Asteraceae, Coreopsideae) is a model for studying polyploidy and aneuploidy. This section is monophyletic, including 24 herbaceous perennials with some polyploid species and others aneuploids. However, the chromosome numbers of some species are still un...
| Hoofdauteurs: | , , , , , , |
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| Formaat: | Online |
| Taal: | spa |
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Instituto de Ecología, A.C.
2017
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| Online toegang: | https://abm.ojs.inecol.mx/index.php/abm/article/view/1199 |
| _version_ | 1799771320425119744 |
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| author | Castro-Castro, Arturo Vargas-Amado, Georgina Castañeda-Nava, José Juvencio Harker, Mollie Munguía-Lino, Guadalupe Santacruz-Ruvalcaba, Fernando Rodríguez, Aarón |
| author_facet | Castro-Castro, Arturo Vargas-Amado, Georgina Castañeda-Nava, José Juvencio Harker, Mollie Munguía-Lino, Guadalupe Santacruz-Ruvalcaba, Fernando Rodríguez, Aarón |
| author_sort | Castro-Castro, Arturo |
| collection | ABM |
| description | Background and Aims: Cosmos section Discopoda (Asteraceae, Coreopsideae) is a model for studying polyploidy and aneuploidy. This section is monophyletic, including 24 herbaceous perennials with some polyploid species and others aneuploids. However, the chromosome numbers of some species are still unknown and their cytogeography has not been studied. Here the chromosome counts for three species are revealed and the ancestral levels of ploidy as well as geographical distributions of the different ploidy levels are compared.Methods: Previously known chromosome counts were retrieved and chromosome counts were made from vegetative parts of three species. After designating a ploidy level to each of 810 registers, including all species and through the use of a geographic information system, their distributions were analyzed based on those ploidy levels. In addition, using a maximum likelihood model, a reconstruction of ancestral ploidy was made.Key results: Cosmos nitidus and C. ramirezianus are diploids (2n=2x=24) while C. pseudoperfoliatus is tetraploid (2n=4x=48). To date, chromosome counts for the 20 species of Cosmos section Discopoda are known, of which 12 are diploids (2n=2x), six are exclusively polyploids (2n=4x, 6x, 8x), four are diploids and polyploids and there are two independent events of aneuploidy. The reconstruction of ancestral ploidy levels revealed that x=12 is the basic number of chromosomes in this section of Cosmos.Conclusions: A correlation between the ploidy levels and geographical ranges of the species of Cosmos section Discopoda does not seem apparent. In contrast, there does seem to be an increase in ploidy levels from south to north, with a concentration of polyploids in the northern area of the Sierra Madre Occidental. |
| format | Online |
| id | oai:oai.abm.ojs.inecol.mx:article-1199 |
| institution | Acta Botanica Mexicana |
| language | spa |
| publishDate | 2017 |
| publisher | Instituto de Ecología, A.C. |
| record_format | ojs |
| spelling | oai:oai.abm.ojs.inecol.mx:article-11992022-11-17T23:00:50Z Chromosomic numbers for three species of Cosmos section Discopoda (Asteraceae, Coreopsideae), with cytogeographic notes Números cromosómicos para tres especies de Cosmos sección Discopoda (Asteraceae, Coreopsideae), con notas citogeográficas Castro-Castro, Arturo Vargas-Amado, Georgina Castañeda-Nava, José Juvencio Harker, Mollie Munguía-Lino, Guadalupe Santacruz-Ruvalcaba, Fernando Rodríguez, Aarón cytogeography Heliantheae Mexican Transition Zone polyploidy Sierra Madre Occidental citogeografía Heliantheae poliploidía Sierra Madre Occidental Zona de Transición Mexicana Background and Aims: Cosmos section Discopoda (Asteraceae, Coreopsideae) is a model for studying polyploidy and aneuploidy. This section is monophyletic, including 24 herbaceous perennials with some polyploid species and others aneuploids. However, the chromosome numbers of some species are still unknown and their cytogeography has not been studied. Here the chromosome counts for three species are revealed and the ancestral levels of ploidy as well as geographical distributions of the different ploidy levels are compared.Methods: Previously known chromosome counts were retrieved and chromosome counts were made from vegetative parts of three species. After designating a ploidy level to each of 810 registers, including all species and through the use of a geographic information system, their distributions were analyzed based on those ploidy levels. In addition, using a maximum likelihood model, a reconstruction of ancestral ploidy was made.Key results: Cosmos nitidus and C. ramirezianus are diploids (2n=2x=24) while C. pseudoperfoliatus is tetraploid (2n=4x=48). To date, chromosome counts for the 20 species of Cosmos section Discopoda are known, of which 12 are diploids (2n=2x), six are exclusively polyploids (2n=4x, 6x, 8x), four are diploids and polyploids and there are two independent events of aneuploidy. The reconstruction of ancestral ploidy levels revealed that x=12 is the basic number of chromosomes in this section of Cosmos.Conclusions: A correlation between the ploidy levels and geographical ranges of the species of Cosmos section Discopoda does not seem apparent. In contrast, there does seem to be an increase in ploidy levels from south to north, with a concentration of polyploids in the northern area of the Sierra Madre Occidental. Antecedentes y Objetivos: Cosmos secc. Discopoda (Asteraceae, Coreopsideae) es un modelo de estudio sobre poliploidía y aneuploidía. La sección es monofilética, agrupa 24 especies herbáceas perennes y existen especies poliploides y aneuploides. Sin embargo, no se conocen los números cromosómicos para todas las especies y su citogeografía no ha sido estudiada. El propósito de la presente comunicación es dar a conocer conteos cromosómicos para tres especies y discutir sobre el nivel de ploidía ancestral y patrones de distribución geográfica de los niveles de ploidía en la sección.Métodos: Se realizó una recopilación de los registros cromosómicos y se realizaron conteos cromosómicos para tres especies a partir de la preparación de estructuras vegetativas. Mediante un sistema de información geográfica y una base de datos geográficos con 810 registros, se analizó la distribución geográfica de niveles de ploidía asignando un nivel de ploidía a cada registro por especie. Además, se realizó una reconstrucción del nivel de ploidía ancestral mediante análisis empleando un modelo de máxima verosimilitud.Resultados clave: Cosmos nitidus y C. ramirezianus son diploides (2n=2x=24) y C. pseudoperfoliatus es tetraploide (2n=4x=48). En Cosmos secc. Discopoda actualmente se conoce el número cromosómico de 20 especies, 12 son diploides (2n=2x), seis taxa son exclusivamente poliploides (2n=4x, 6x, 8x), cuatro son diploides y poliploides y existen dos eventos independientes de aneuploidía. La reconstrucción del nivel de ploidía ancestral permite reconocer que x=12 es el número cromosómico básico en la sección.Conclusiones: Las especies de Cosmos secc. Discopoda no muestran una correlación entre los niveles de ploidía y sus rangos de distribución geográfica. En contraste, existe un aumento del nivel de ploidía de sur a norte, con una concentración de poliploides en el norte de la Sierra Madre Occidental. Instituto de Ecología, A.C. 2017-01-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion artículo evaluado por pares application/pdf text/html https://abm.ojs.inecol.mx/index.php/abm/article/view/1199 10.21829/abm118.2017.1199 Acta Botanica Mexicana; No. 118 (2017); 41-52 Acta Botanica Mexicana; Núm. 118 (2017); 41-52 2448-7589 0187-7151 spa https://abm.ojs.inecol.mx/index.php/abm/article/view/1199/1398 https://abm.ojs.inecol.mx/index.php/abm/article/view/1199/html Derechos de autor 2016 Acta Botanica Mexicana |
| spellingShingle | Castro-Castro, Arturo Vargas-Amado, Georgina Castañeda-Nava, José Juvencio Harker, Mollie Munguía-Lino, Guadalupe Santacruz-Ruvalcaba, Fernando Rodríguez, Aarón Chromosomic numbers for three species of Cosmos section Discopoda (Asteraceae, Coreopsideae), with cytogeographic notes |
| title | Chromosomic numbers for three species of Cosmos section Discopoda (Asteraceae, Coreopsideae), with cytogeographic notes |
| title_full | Chromosomic numbers for three species of Cosmos section Discopoda (Asteraceae, Coreopsideae), with cytogeographic notes |
| title_fullStr | Chromosomic numbers for three species of Cosmos section Discopoda (Asteraceae, Coreopsideae), with cytogeographic notes |
| title_full_unstemmed | Chromosomic numbers for three species of Cosmos section Discopoda (Asteraceae, Coreopsideae), with cytogeographic notes |
| title_short | Chromosomic numbers for three species of Cosmos section Discopoda (Asteraceae, Coreopsideae), with cytogeographic notes |
| title_sort | chromosomic numbers for three species of cosmos section discopoda (asteraceae, coreopsideae), with cytogeographic notes |
| url | https://abm.ojs.inecol.mx/index.php/abm/article/view/1199 |
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