Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).

Detalhes bibliográficos
Autor(a) principal: BERNARDO FILHO, R. A.
Data de Publicação: 2014
Outros Autores: SANTOS, A. C. C., SOUZA, F. H. D. de, VALLS, J. F. M., PAGLIARINI, M. S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/983777
Resumo: Cytological investigation revealed complete asynapsis during microsporogenesis in 2 wild accessions of Paspalum jesuiticum collected in distinct Brazilian regions. Both accessions were hexaploid (2n = 6x = 60) and 60 univalents could be counted at diakinesis. In this phase, the majority of meiocytes exhibited univalents with both chromatids. After alignment at the metaphase plate, the chromatids segregated to the poles. Only 1 meiotic division (equational) occurred, and after cytokinesis, a dyad with 2n microspores was formed. The genetic constitution of the 2n gametes was equivalent to that of first division restitution (FDR). Since recombination did not occur, 100% transmission of parental heterozygosity could be expected from the FDR 2n gametes. The meiotic behavior of both accessions suggested that they resulted from a recent natural hybridization event. The potential use of the 2n gametes in Paspalum breeding programs has been discussed.
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spelling Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).Poaceaehexaploidyinterspecific hybridizationmeiosispolyploidyCytological investigation revealed complete asynapsis during microsporogenesis in 2 wild accessions of Paspalum jesuiticum collected in distinct Brazilian regions. Both accessions were hexaploid (2n = 6x = 60) and 60 univalents could be counted at diakinesis. In this phase, the majority of meiocytes exhibited univalents with both chromatids. After alignment at the metaphase plate, the chromatids segregated to the poles. Only 1 meiotic division (equational) occurred, and after cytokinesis, a dyad with 2n microspores was formed. The genetic constitution of the 2n gametes was equivalent to that of first division restitution (FDR). Since recombination did not occur, 100% transmission of parental heterozygosity could be expected from the FDR 2n gametes. The meiotic behavior of both accessions suggested that they resulted from a recent natural hybridization event. The potential use of the 2n gametes in Paspalum breeding programs has been discussed.R. A. BERNARDO FILHO, Universidade Estadual de MaringáA. C. C. SANTOS, Universidade Estadual de MaringáFRANCISCO HUMBERTO DUBBERN DE SOUZA, CPPSEJOSE FRANCISCO MONTENEGRO VALLS, CENARGENM. S. PAGLIARINI, Universidade Estadual de Maringá.BERNARDO FILHO, R. A.SANTOS, A. C. C.SOUZA, F. H. D. deVALLS, J. F. M.PAGLIARINI, M. S.2014-04-02T11:11:11Z2014-04-02T11:11:11Z2014-04-0220142016-02-29T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleGenetics and Molecular Research, v. 13, n. 1, p. 255-261, jan. 2014.http://www.alice.cnptia.embrapa.br/alice/handle/doc/98377710.4238/2014.January.17.9enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-16T02:59:43Zoai:www.alice.cnptia.embrapa.br:doc/983777Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-16T02:59:43falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-16T02:59:43Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
title Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
spellingShingle Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
BERNARDO FILHO, R. A.
Poaceae
hexaploidy
interspecific hybridization
meiosis
polyploidy
title_short Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
title_full Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
title_fullStr Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
title_full_unstemmed Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
title_sort Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
author BERNARDO FILHO, R. A.
author_facet BERNARDO FILHO, R. A.
SANTOS, A. C. C.
SOUZA, F. H. D. de
VALLS, J. F. M.
PAGLIARINI, M. S.
author_role author
author2 SANTOS, A. C. C.
SOUZA, F. H. D. de
VALLS, J. F. M.
PAGLIARINI, M. S.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv R. A. BERNARDO FILHO, Universidade Estadual de Maringá
A. C. C. SANTOS, Universidade Estadual de Maringá
FRANCISCO HUMBERTO DUBBERN DE SOUZA, CPPSE
JOSE FRANCISCO MONTENEGRO VALLS, CENARGEN
M. S. PAGLIARINI, Universidade Estadual de Maringá.
dc.contributor.author.fl_str_mv BERNARDO FILHO, R. A.
SANTOS, A. C. C.
SOUZA, F. H. D. de
VALLS, J. F. M.
PAGLIARINI, M. S.
dc.subject.por.fl_str_mv Poaceae
hexaploidy
interspecific hybridization
meiosis
polyploidy
topic Poaceae
hexaploidy
interspecific hybridization
meiosis
polyploidy
description Cytological investigation revealed complete asynapsis during microsporogenesis in 2 wild accessions of Paspalum jesuiticum collected in distinct Brazilian regions. Both accessions were hexaploid (2n = 6x = 60) and 60 univalents could be counted at diakinesis. In this phase, the majority of meiocytes exhibited univalents with both chromatids. After alignment at the metaphase plate, the chromatids segregated to the poles. Only 1 meiotic division (equational) occurred, and after cytokinesis, a dyad with 2n microspores was formed. The genetic constitution of the 2n gametes was equivalent to that of first division restitution (FDR). Since recombination did not occur, 100% transmission of parental heterozygosity could be expected from the FDR 2n gametes. The meiotic behavior of both accessions suggested that they resulted from a recent natural hybridization event. The potential use of the 2n gametes in Paspalum breeding programs has been discussed.
publishDate 2014
dc.date.none.fl_str_mv 2014-04-02T11:11:11Z
2014-04-02T11:11:11Z
2014-04-02
2014
2016-02-29T11:11:11Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Genetics and Molecular Research, v. 13, n. 1, p. 255-261, jan. 2014.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/983777
10.4238/2014.January.17.9
identifier_str_mv Genetics and Molecular Research, v. 13, n. 1, p. 255-261, jan. 2014.
10.4238/2014.January.17.9
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/983777
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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