Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants

Background and Aims: Gametophytic apomixis is regularly associated with polyploidy. It has been hypothesized that apomixis is not present in diploid plants because of a pleiotropic lethal effect associated with monoploid gametes. Rare apomictic triploid plants for Paspalum notatum and P. simplex, wh...

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Autores principales: Martínez, Eric Javier, Acuña, Carlos Alberto, Hojsgaard, Diego Hernán, Tcach, Mauricio Alejandro, Quarín, Camilo León
Formato: Artículo
Lenguaje:Inglés
Publicado: Oxford University Press 2025
Materias:
Apomixis
monoploid gametes
Paspalum notatum
Paspalum simplex
polyploidy
RAPD
SCAR
triploidy
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/58287
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-58287
record_format dspace
spelling I48-R184-123456789-582872025-08-28T13:59:52Z Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants Martínez, Eric Javier Acuña, Carlos Alberto Hojsgaard, Diego Hernán Tcach, Mauricio Alejandro Quarín, Camilo León Apomixis monoploid gametes Paspalum notatum Paspalum simplex polyploidy RAPD SCAR triploidy Background and Aims: Gametophytic apomixis is regularly associated with polyploidy. It has been hypothesized that apomixis is not present in diploid plants because of a pleiotropic lethal effect associated with monoploid gametes. Rare apomictic triploid plants for Paspalum notatum and P. simplex, which usually have sexual diploid and apomictic tetraploid races, were acquired. These triploids normally produce male gametes through meiosis with a range of chromosome numbers from monoploid (n = 10) to diploid (n = 20). The patterns of apomixis transmission in Paspalum were investigated in relation to the ploidy levels of gametes. Methods: Intraspecific crosses were made between sexual diploid, triploid and tetraploid plants as female parents and apomictic triploid plants as male parents. Apomictic progeny were identified by using molecular markers completely linked to apomixis and the analysis of mature embryo sacs. The chromosome number of the male gamete was inferred from chromosome counts of each progeny. Key Results: The chromosome numbers of the progeny indicated that the chromosome input of male gametes depended on the chromosome number of the female gamete. The apomictic trait was not transmitted through monoploid gametes, at least when the progeny was diploid. Diploid or near-diploid gametes transmitted apomixis at very low rates. Conclusions: Since male monoploid gametes usually failed to form polyploid progenies, for example triploids after 4x × 3x crosses, it was not possible to determine whether apomixis could segregate in polyploid progenies by means of monoploid gametes. 2025-08-28T13:36:56Z 2025-08-28T13:36:56Z 2007-11-01 Artículo Martínez, Eric Javier, et al., 2007. Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants. Annals of Botany. Oxford: Oxford University Press, vol. 100, no. 6, p. 1239-1247. E-ISSN 1095-8290. DOI https://doi.org/10.1093/aob/mcm201 0305-7364 http://repositorio.unne.edu.ar/handle/123456789/58287 eng https://doi.org/10.1093/aob/mcm201 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 1239-1247 application/pdf Oxford University Press Annals of Botany, 2007, vol. 100, no. 6, p. 1239-1247.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Apomixis
monoploid gametes
Paspalum notatum
Paspalum simplex
polyploidy
RAPD
SCAR
triploidy
spellingShingle Apomixis
monoploid gametes
Paspalum notatum
Paspalum simplex
polyploidy
RAPD
SCAR
triploidy
Martínez, Eric Javier
Acuña, Carlos Alberto
Hojsgaard, Diego Hernán
Tcach, Mauricio Alejandro
Quarín, Camilo León
Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants
topic_facet Apomixis
monoploid gametes
Paspalum notatum
Paspalum simplex
polyploidy
RAPD
SCAR
triploidy
description Background and Aims: Gametophytic apomixis is regularly associated with polyploidy. It has been hypothesized that apomixis is not present in diploid plants because of a pleiotropic lethal effect associated with monoploid gametes. Rare apomictic triploid plants for Paspalum notatum and P. simplex, which usually have sexual diploid and apomictic tetraploid races, were acquired. These triploids normally produce male gametes through meiosis with a range of chromosome numbers from monoploid (n = 10) to diploid (n = 20). The patterns of apomixis transmission in Paspalum were investigated in relation to the ploidy levels of gametes. Methods: Intraspecific crosses were made between sexual diploid, triploid and tetraploid plants as female parents and apomictic triploid plants as male parents. Apomictic progeny were identified by using molecular markers completely linked to apomixis and the analysis of mature embryo sacs. The chromosome number of the male gamete was inferred from chromosome counts of each progeny. Key Results: The chromosome numbers of the progeny indicated that the chromosome input of male gametes depended on the chromosome number of the female gamete. The apomictic trait was not transmitted through monoploid gametes, at least when the progeny was diploid. Diploid or near-diploid gametes transmitted apomixis at very low rates. Conclusions: Since male monoploid gametes usually failed to form polyploid progenies, for example triploids after 4x × 3x crosses, it was not possible to determine whether apomixis could segregate in polyploid progenies by means of monoploid gametes.
format Artículo
author Martínez, Eric Javier
Acuña, Carlos Alberto
Hojsgaard, Diego Hernán
Tcach, Mauricio Alejandro
Quarín, Camilo León
author_facet Martínez, Eric Javier
Acuña, Carlos Alberto
Hojsgaard, Diego Hernán
Tcach, Mauricio Alejandro
Quarín, Camilo León
author_sort Martínez, Eric Javier
title Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants
title_short Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants
title_full Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants
title_fullStr Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants
title_full_unstemmed Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants
title_sort segregation for sexual seed production in paspalum as directed by male gametes of apomictic triploid plants
publisher Oxford University Press
publishDate 2025
url http://repositorio.unne.edu.ar/handle/123456789/58287
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