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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste; Embrapa Recursos Genéticos e Biotecnologia. |
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Data corrente: |
02/04/2014 |
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Data da última atualização: |
13/03/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BERNARDO FILHO, R. A.; SANTOS, A. C. C.; SOUZA, F. H. D. de; VALLS, J. F. M.; PAGLIARINI, M. S. |
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Afiliação: |
FRANCISCO HUMBERTO DUBBERN DE SOUZA, CPPSE; JOSE FRANCISCO MONTENEGRO VALLS, CENARGEN. |
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Título: |
Complete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae). |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Genetics and Molecular Research, v. 13, n. 1, p. 255-261, 2014. |
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ISBN: |
1676-5680 |
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Idioma: |
Inglês
Português |
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Conteúdo: |
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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Thesaurus Nal: |
hexaploidy; interspecific hybridization; meiosis; Poaceae; polyploidy. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/180009/1/gmr2770.pdf
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/100921/1/PROCI-2014.00009.pdf
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Marc: |
LEADER 01672naa a2200241 a 4500
001 1994921
005 2023-03-13
008 2014 bl uuuu u00u1 u #d
022 $a1676-5680
100 1 $aBERNARDO FILHO, R. A.
245 $aComplete asynapsis resulting in 2n pollen formation in Paspalum jesuiticum Parodi (Poaceae).$h[electronic resource]
260 $c2014
520 $aCytological 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.
650 $ahexaploidy
650 $ainterspecific hybridization
650 $ameiosis
650 $aPoaceae
650 $apolyploidy
700 1 $aSANTOS, A. C. C.
700 1 $aSOUZA, F. H. D. de
700 1 $aVALLS, J. F. M.
700 1 $aPAGLIARINI, M. S.
773 $tGenetics and Molecular Research$gv. 13, n. 1, p. 255-261, 2014.
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Embrapa Recursos Genéticos e Biotecnologia (CENARGEN) |
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