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Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
BACKGROUND: Senecio is the largest genus in the Asteraceae family growing in all environments around the world. It displays taxonomic and systematical difficulties. Cytogenetic knowledge of this genus is ancient, scarce and mainly restricted to chromosome number records. RESULTS: In this study we an...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5432766/ https://www.ncbi.nlm.nih.gov/pubmed/28510859 http://dx.doi.org/10.1186/1999-3110-54-20 |
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author | Lopez, Mariana G Xifreda, Cecilia C Poggio, Lidia Wulff, Arturo F |
author_facet | Lopez, Mariana G Xifreda, Cecilia C Poggio, Lidia Wulff, Arturo F |
author_sort | Lopez, Mariana G |
collection | PubMed |
description | BACKGROUND: Senecio is the largest genus in the Asteraceae family growing in all environments around the world. It displays taxonomic and systematical difficulties. Cytogenetic knowledge of this genus is ancient, scarce and mainly restricted to chromosome number records. RESULTS: In this study we analyzed chromosome number, meiotic configuration, bivalent morphology, meiotic behavior and pollen grain stainability on 100 accessions of 27 different polyploid Senecio L. sect Senecio entities. Median, standard deviation and mode were calculated for number and position of chiasmata and meiotic recombination was statistically evaluated. Although high frequency of multivalents and associated meiotic irregularities are expected in high polyploids, bivalents predominance and, consequently, regular meiosis were observed, with normal sporogenesis and high pollen grain stainability. CONCLUSION: Depletion in the total chiasmata was significant only in some species but the terminal position was preferential in all the entities analyzed, indicating significant reduction in recombination. The regular meiosis observed suggest that intra and intergenomic reorganization process occur quickly and efficiently in this genus. Mechanisms of diploidization, common to all polyploids, are reinforced by the strong reduction in crossing-over rushing polyploids stabilization. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/1999-3110-54-20) contains supplementary material, which is available to authorized users. |
format | Online Article Text |
id | pubmed-5432766 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-54327662017-05-31 Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae) Lopez, Mariana G Xifreda, Cecilia C Poggio, Lidia Wulff, Arturo F Bot Stud Research BACKGROUND: Senecio is the largest genus in the Asteraceae family growing in all environments around the world. It displays taxonomic and systematical difficulties. Cytogenetic knowledge of this genus is ancient, scarce and mainly restricted to chromosome number records. RESULTS: In this study we analyzed chromosome number, meiotic configuration, bivalent morphology, meiotic behavior and pollen grain stainability on 100 accessions of 27 different polyploid Senecio L. sect Senecio entities. Median, standard deviation and mode were calculated for number and position of chiasmata and meiotic recombination was statistically evaluated. Although high frequency of multivalents and associated meiotic irregularities are expected in high polyploids, bivalents predominance and, consequently, regular meiosis were observed, with normal sporogenesis and high pollen grain stainability. CONCLUSION: Depletion in the total chiasmata was significant only in some species but the terminal position was preferential in all the entities analyzed, indicating significant reduction in recombination. The regular meiosis observed suggest that intra and intergenomic reorganization process occur quickly and efficiently in this genus. Mechanisms of diploidization, common to all polyploids, are reinforced by the strong reduction in crossing-over rushing polyploids stabilization. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/1999-3110-54-20) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2013-08-27 /pmc/articles/PMC5432766/ /pubmed/28510859 http://dx.doi.org/10.1186/1999-3110-54-20 Text en © Lopez et al.; licensee Springer. 2013 This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Lopez, Mariana G Xifreda, Cecilia C Poggio, Lidia Wulff, Arturo F Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae) |
title | Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae) |
title_full | Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae) |
title_fullStr | Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae) |
title_full_unstemmed | Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae) |
title_short | Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae) |
title_sort | deep cytogenetics analysis reveals meiotic recombination depletion in species of senecio (asteraceae) |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5432766/ https://www.ncbi.nlm.nih.gov/pubmed/28510859 http://dx.doi.org/10.1186/1999-3110-54-20 |
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