Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).
Autor(a) principal: | |
---|---|
Data de Publicação: | 2014 |
Outros Autores: | , , , |
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. |
id |
EMBR_7714210e09ba9ca34772a524270bb23a |
---|---|
oai_identifier_str |
oai:www.alice.cnptia.embrapa.br:doc/983777 |
network_acronym_str |
EMBR |
network_name_str |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
repository_id_str |
2154 |
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 |
_version_ |
1794503389241933824 |