Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina.

Chrysolaena flexuosa is a South American species of potential ornamental value (basic chromosome number of x=10). Diploid (n=10) and tetraploid (n=20) cytotypes have been reported for its distribution area, although one hexaploid (n=30-32ca.) cytotype has been reported for its most southern distribu...

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Autores principales:	Echeverría, María Lis, Camadro, Elsa Lucila
Formato:	Artículo revista
Lenguaje:	Inglés
Publicado:	Sociedad Argentina de Botánica 2017
Materias:	Citotipos poliploides contenido de ADN citometría de flujo anormalidades meióticas orientación anormal de los husos polen 2n. Polyploid cytotypes DNA content flow cytometry meiotic abnormalities abnormal spindle orientation 2n pollen
Acceso en línea:	https://revistas.unc.edu.ar/index.php/BSAB/article/view/18860
Aporte de:	Boletín de la Sociedad Argentina de Botánica de Universidad Nacional de Córdoba

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institution	Universidad Nacional de Córdoba
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repository_str	R-325
container_title_str	Boletín de la Sociedad Argentina de Botánica
language	Inglés
format	Artículo revista
topic	Citotipos poliploides contenido de ADN citometría de flujo anormalidades meióticas orientación anormal de los husos polen 2n. Polyploid cytotypes DNA content flow cytometry meiotic abnormalities abnormal spindle orientation 2n pollen
spellingShingle	Citotipos poliploides contenido de ADN citometría de flujo anormalidades meióticas orientación anormal de los husos polen 2n. Polyploid cytotypes DNA content flow cytometry meiotic abnormalities abnormal spindle orientation 2n pollen Echeverría, María Lis Camadro, Elsa Lucila Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina.
topic_facet	Citotipos poliploides contenido de ADN citometría de flujo anormalidades meióticas orientación anormal de los husos polen 2n. Polyploid cytotypes DNA content flow cytometry meiotic abnormalities abnormal spindle orientation 2n pollen
author	Echeverría, María Lis Camadro, Elsa Lucila
author_facet	Echeverría, María Lis Camadro, Elsa Lucila
author_sort	Echeverría, María Lis
title	Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina.
title_short	Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina.
title_full	Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina.
title_fullStr	Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina.
title_full_unstemmed	Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina.
title_sort	chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species chrysolaena flexuosa (vernonieae, compositae) from its distribution range in argentina. chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species chrysolaena flexuosa (vernonieae, compositae) from its distribution range in argentina.
description	Chrysolaena flexuosa is a South American species of potential ornamental value (basic chromosome number of x=10). Diploid (n=10) and tetraploid (n=20) cytotypes have been reported for its distribution area, although one hexaploid (n=30-32ca.) cytotype has been reported for its most southern distribution. To investigate if ploidy and latitude are positively related in Ch. flexuosa natural populations and if sexual polyploidization could have had a role in the origin of the polyploid cytotypes, we determined chromosome numbers, DNA content, and pollen viability and size, and analyzed microsporogenesis in samples of seven Argentinian accessions. Two of the northeastern accessions were diploid and one was tetraploid, whereas the four southeastern accessions were hexaploid. Ploidy levels determined both by chromosome countings and flow cytometry coincided, although monoploid genome size significantly decreased with increasing ploidy. In all accessions, variability was observed for pollen viability and size, as well as for large (presumably 2n) pollen production. This variability was underlined by abnormal cytological events in meiosis and at the tetrad stage (lagging chromosomes, parallel spindles, triads). The results would indicate that there is, apparently, a positive relation between ploidy and latitude, and suggest a likely role of sexual polyploidization in the origin, establishment and expansion of Ch. flexuosa populations.
publisher	Sociedad Argentina de Botánica
publishDate	2017
url	https://revistas.unc.edu.ar/index.php/BSAB/article/view/18860
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first_indexed	2024-09-03T22:48:58Z
last_indexed	2024-09-03T22:48:58Z
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spelling	I10-R325-article-188602019-12-14T13:47:03Z Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Chromosome numbers, meiotic abnormalities, and 2n pollen formation in accessions of the wild species Chrysolaena flexuosa (Vernonieae, Compositae) from its distribution range in Argentina. Número de cromosomas, anomalías meióticas y formación de polen 2n en accesiones de la especie silvestre Chrysolaena flexuosa (Vernonieae, Compositae) de su rango de distribución en Argentina. Echeverría, María Lis Camadro, Elsa Lucila Citotipos poliploides contenido de ADN citometría de flujo anormalidades meióticas orientación anormal de los husos polen 2n. Polyploid cytotypes DNA content flow cytometry meiotic abnormalities abnormal spindle orientation 2n pollen Chrysolaena flexuosa is a South American species of potential ornamental value (basic chromosome number of x=10). Diploid (n=10) and tetraploid (n=20) cytotypes have been reported for its distribution area, although one hexaploid (n=30-32ca.) cytotype has been reported for its most southern distribution. To investigate if ploidy and latitude are positively related in Ch. flexuosa natural populations and if sexual polyploidization could have had a role in the origin of the polyploid cytotypes, we determined chromosome numbers, DNA content, and pollen viability and size, and analyzed microsporogenesis in samples of seven Argentinian accessions. Two of the northeastern accessions were diploid and one was tetraploid, whereas the four southeastern accessions were hexaploid. Ploidy levels determined both by chromosome countings and flow cytometry coincided, although monoploid genome size significantly decreased with increasing ploidy. In all accessions, variability was observed for pollen viability and size, as well as for large (presumably 2n) pollen production. This variability was underlined by abnormal cytological events in meiosis and at the tetrad stage (lagging chromosomes, parallel spindles, triads). The results would indicate that there is, apparently, a positive relation between ploidy and latitude, and suggest a likely role of sexual polyploidization in the origin, establishment and expansion of Ch. flexuosa populations. Número de cromosomas, anomalías meióticas y formación de polen 2n en accesiones de la especie silvestre Chrysolaena flexuosa (Vernonieae, Compositae) de su rango de distribución en Argentina. Chrysolaena flexuosa es una especie sudamericana de potencial valor ornamental. Para el área principal de su distribución fueron reportados citotipos diploides (n=10) y tetraploides (n=20) mientras que para el área más austral sólo existe un registro correspondiente a un citotipo hexaploide (n=30-32ca.). Para investigar, en poblaciones naturales de Ch. flexuosa, una relación positiva entre la ploidía y la latitud y la posible participación de la poliploidización sexual en el origen de los citotipos poliploides, se determinó, en siete introducciones argentinas, el número cromosómico, contenido de ADN y tamaño y viabilidad de polen y se analizó la microesporogénesis. Las introducciones del noreste resultaron diploides y tetraploides mientras que las introducciones del sudeste resultaron hexaploides. El nivel de ploidía determinado a partir de conteos cromosómicos coincidió con lo obtenido mediante citometría de flujo; el tamaño genómico se redujo significativamente con la ploidía. Todas las introducciones presentaron variabilidad en viabilidad y tamaño de polen así como producción de granos grandes (presumiblemente polen 2n). Esta variabilidad fue acompañada por eventos citológicos anormales en meiosis y en el estadio de tétrada. Los resultados evidencian una potencial relación entre la ploidía y la latitud y la posibilidad de poliploidización sexual en el origen, establecimiento y expansión de las poblaciones de Ch. flexuosa. Sociedad Argentina de Botánica 2017-12-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo original application/pdf https://revistas.unc.edu.ar/index.php/BSAB/article/view/18860 10.31055/1851.2372.v52.n4.18860 Boletín de la Sociedad Argentina de Botánica (Journal of the Argentine Botanical Society; Vol. 52 No. 4 (2017): December; 737-752 Boletín de la Sociedad Argentina de Botánica; Vol. 52 Núm. 4 (2017): Diciembre; 737-752 Boletín de la Sociedad Argentina de Botánica; v. 52 n. 4 (2017): Diciembre; 737-752 1851-2372 0373-580X 10.31055/1851.2372.v52.n4 eng https://revistas.unc.edu.ar/index.php/BSAB/article/view/18860/18748 Derechos de autor 2017 Boletín de la Sociedad Argentina de Botánica

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