Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae).

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Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae). Turnera sidoides (x = 7) is an autopolyploid complex of outcrossing perennial herbs that includes five subspecies, with ploidy levels from diploid (2n =...

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Autores principales: Kovalsky, Ivana Evelin, Fernández, Aveliano, Solís Neffa, Viviana G.
Formato: Artículo revista
Lenguaje:Español
Publicado: Sociedad Argentina de Botánica 2014
Materias:
Turnera sidoides
poliploidía
gametos no reducidos
meiosis
viabilidad del polen.
poliploidy
unreduced gametes
pollen viability
Acceso en línea:https://revistas.unc.edu.ar/index.php/BSAB/article/view/7854
Aporte de:
Boletín de la Sociedad Argentina de Botánica de Universidad Nacional de Córdoba
id I10-R325-article-7854
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spelling I10-R325-article-78542024-09-03T22:47:29Z Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae). Mecanismos citológicos involucrados en la producción de gametos masculinos no reducidos en individuos diploides de Turnera sidoides subsp. carnea (Passifloraceae Kovalsky, Ivana Evelin Fernández, Aveliano Solís Neffa, Viviana G. Turnera sidoides poliploidía gametos no reducidos meiosis viabilidad del polen. Turnera sidoides poliploidy unreduced gametes meiosis pollen viability Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae). Turnera sidoides (x = 7) is an autopolyploid complex of outcrossing perennial herbs that includes five subspecies, with ploidy levels from diploid (2n = 2x = 14) to octoploid (2n = 8x = 56). Previous studies have revealed the production of unreduced male gametes (2n and 4n) in diploid populations of this complex, suggesting that sexual polyploidyzation would be the main mechanism involved in the origin of neopoliploids of T. sidoides. However, to date, there is a lack of data about the cytological mechanisms involved in the origin of such unreduced gametes. Thus, in this paper we analyze the meiotic behaviour and pollen viability of unreduced gametes producers from a diploid population of T. sidoides subsp. carnea. The results obtained showed that meiotic behavior was mostly regular; however some irregularities such as parallel spindles, fused spindles and nuclear restitution were also observed. Pollen viability varied from 44.75% to 95.82%. Overall, our results suggest that nuclear restitution at both the first and the second meiotic division would be the cytological mechanisms involved in the production of 2n male gametes. Such mechanisms would have important consequences in the establishments of neopolyploids in natural populations. Turnera sidoides (x = 7) es un complejo autopoliploide de hierbas alógamas perennes que incluye cinco subespecies, con niveles de ploidía desde diploide (2n = 2x = 14) hasta octoploide (2n = 8x = 56). Estudios previos aportaron evidencias de la producción de gametos masculinos no reducidos (2n y 4n) en poblaciones diploides del complejo, sugiriendo que los poliploides de T. sidoides habrían surgido por poliploidización sexual. Sin embargo, hasta el momento se desconocen los mecanismos citológicos involucrados en la producción de dichos gametos. Por lo tanto, en este trabajo se analiza el comportamiento meiótico y la viabilidad del polen de individuos productores de gametos no reducidos de una población diploide de T. sidoides subsp. carnea. Los resultados obtenidos evidenciaron que la meiosis es generalmente regular, aunque también se observaron algunas irregularidades como husos paralelos, husos fusionados y núcleos de restitución. La viabilidad del polen varió entre 44,75% y 95,82%. Todos estos resultados sugieren que la restitución nuclear tanto en la primera división como en la segunda división meiótica serían los mecanismos involucrados en la producción de gametos masculinos no reducidos en el complejo. Estos mecanismos tendrían importantes consecuencias en el establecimiento de neopoliploides en poblaciones naturales de T. sidoides. Sociedad Argentina de Botánica 2014-08-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo original application/pdf https://revistas.unc.edu.ar/index.php/BSAB/article/view/7854 10.31055/1851.2372.v49.n2.7854 Boletín de la Sociedad Argentina de Botánica (Journal of the Argentine Botanical Society; Vol. 49 No. 2 (2014): Julio; 227-234 Boletín de la Sociedad Argentina de Botánica; Vol. 49 Núm. 2 (2014): Julio; 227-234 Boletín de la Sociedad Argentina de Botánica; v. 49 n. 2 (2014): Julio; 227-234 1851-2372 0373-580X 10.31055/1851.2372.v49.n2 spa https://revistas.unc.edu.ar/index.php/BSAB/article/view/7854/8724
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-325
container_title_str Boletín de la Sociedad Argentina de Botánica
language Español
format Artículo revista
topic Turnera sidoides
poliploidía
gametos no reducidos
meiosis
viabilidad del polen.
Turnera sidoides
poliploidy
unreduced gametes
meiosis
pollen viability
spellingShingle Turnera sidoides
poliploidía
gametos no reducidos
meiosis
viabilidad del polen.
Turnera sidoides
poliploidy
unreduced gametes
meiosis
pollen viability
Kovalsky, Ivana Evelin
Fernández, Aveliano
Solís Neffa, Viviana G.
Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae).
topic_facet Turnera sidoides
poliploidía
gametos no reducidos
meiosis
viabilidad del polen.
Turnera sidoides
poliploidy
unreduced gametes
meiosis
pollen viability
author Kovalsky, Ivana Evelin
Fernández, Aveliano
Solís Neffa, Viviana G.
author_facet Kovalsky, Ivana Evelin
Fernández, Aveliano
Solís Neffa, Viviana G.
author_sort Kovalsky, Ivana Evelin
title Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae).
title_short Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae).
title_full Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae).
title_fullStr Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae).
title_full_unstemmed Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae).
title_sort cytological mechanisms involved in the unreduced male gametes production in diploid individuals of turnera sidoides subsp. carnea (passifloraceae).
description Cytological mechanisms involved in the unreduced male gametes production in diploid individuals of Turnera sidoides subsp. carnea (Passifloraceae). Turnera sidoides (x = 7) is an autopolyploid complex of outcrossing perennial herbs that includes five subspecies, with ploidy levels from diploid (2n = 2x = 14) to octoploid (2n = 8x = 56). Previous studies have revealed the production of unreduced male gametes (2n and 4n) in diploid populations of this complex, suggesting that sexual polyploidyzation would be the main mechanism involved in the origin of neopoliploids of T. sidoides. However, to date, there is a lack of data about the cytological mechanisms involved in the origin of such unreduced gametes. Thus, in this paper we analyze the meiotic behaviour and pollen viability of unreduced gametes producers from a diploid population of T. sidoides subsp. carnea. The results obtained showed that meiotic behavior was mostly regular; however some irregularities such as parallel spindles, fused spindles and nuclear restitution were also observed. Pollen viability varied from 44.75% to 95.82%. Overall, our results suggest that nuclear restitution at both the first and the second meiotic division would be the cytological mechanisms involved in the production of 2n male gametes. Such mechanisms would have important consequences in the establishments of neopolyploids in natural populations.
publisher Sociedad Argentina de Botánica
publishDate 2014
url https://revistas.unc.edu.ar/index.php/BSAB/article/view/7854
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first_indexed 2024-09-03T22:49:41Z
last_indexed 2024-09-03T22:49:41Z
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