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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
10/07/2009 |
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Data da última atualização: |
20/07/2009 |
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Autoria: |
RISSO-PASCOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
Claudicéia Risso-Pascotto, UEM; Maria Suely Pagliarini, UEM; Cacilda Borges do Valle, CNPGC. |
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Título: |
Abnormal nucleolar cycle in microsporogenesis of Brachiaria decumbens (Gramineae). |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Cytologia, Tokyo, v. 67, n. 4, p. 355-360, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
Cytogenetic studies carried out on the tetraploid (2n=4x=36) accession of Brachiaria decumbens (BRA007722) revealed an unusual pattern of the nucleolar cycle during microsporogenesis. Nucleolus behavior was normal during prophase and disappeared at the end of diakinesis. After dissolution, it was fractioned into multiple micronucleoli of different sizes at metaphase which persisted during early anaphase. Some entered in a fusion process in late anaphase: they reduced their number and increased in size. Since fusion process continued throughout the cycle, in late telophase all were rejoined into a unique nucleolus in the sister nuclei. They persisted in this condition until the end of prophase II and then disappeared once more. Such nucleolar behavior was also reported in the second division, while at the end of the meiotic process tetrads had 4 microspores with a normal nucleolus. Pollen viability was not affected by this anomalous nucleolar cycle behavior. A mutation affecting some steps of the nucleolar cycle has been suggested. |
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Palavras-Chave: |
Braquiária; Microsporogênese. |
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Thesagro: |
Brachiaria Decumbens; Citogenética; Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem. |
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Categoria do assunto: |
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Marc: |
LEADER 01709naa a2200229 a 4500
001 1327025
005 2009-07-20
008 2002 bl --- 0-- u #d
100 1 $aRISSO-PASCOTTO, C.
245 $aAbnormal nucleolar cycle in microsporogenesis of Brachiaria decumbens (Gramineae).
260 $c2002
520 $aCytogenetic studies carried out on the tetraploid (2n=4x=36) accession of Brachiaria decumbens (BRA007722) revealed an unusual pattern of the nucleolar cycle during microsporogenesis. Nucleolus behavior was normal during prophase and disappeared at the end of diakinesis. After dissolution, it was fractioned into multiple micronucleoli of different sizes at metaphase which persisted during early anaphase. Some entered in a fusion process in late anaphase: they reduced their number and increased in size. Since fusion process continued throughout the cycle, in late telophase all were rejoined into a unique nucleolus in the sister nuclei. They persisted in this condition until the end of prophase II and then disappeared once more. Such nucleolar behavior was also reported in the second division, while at the end of the meiotic process tetrads had 4 microspores with a normal nucleolus. Pollen viability was not affected by this anomalous nucleolar cycle behavior. A mutation affecting some steps of the nucleolar cycle has been suggested.
650 $aBrachiaria Decumbens
650 $aCitogenética
650 $aGramínea Forrageira
650 $aMelhoramento Genético Vegetal
650 $aPastagem
653 $aBraquiária
653 $aMicrosporogênese
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tCytologia, Tokyo$gv. 67, n. 4, p. 355-360, 2002.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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| Registros recuperados : 24 | |
| 11. |  | PAGLIARINI, M. S.; RISSO-PASCOTTO, C.; SOUZA-KANESHIMA, A. M. de; VALLE, C. B. do. Analysis of meiotic behavior in selecting potential genitors among diploid and artifcially induced tetraploid accessions of Brachiaria ruziziensis (Poaceae). Euphytica, Wageningen, Holanda, v. 164, n.1 , p. 181-187, nov. 2008.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 20. | | BOLDRINI, K. R.; MICHELETTI, P. L.; RISSO-PASCOTTO, C.; ADAMOWSKI, E. V.; PAGLIARINI, M. S.; VALLE, C. B. Um novo mecanismo de formação de gametas 2n em Brachiaria (POACEAE). In: CONGRESSO BRASILEIRO DE GENÉTICA, 51., 2005, Águas de Lindóia. Da Bioestatística à Bioinformática - a era da Genômica: [anais]. Águas de Lindóia: Sociedade Brasileira de Genética, 2005. p. 523 1 CD-ROM.| Biblioteca(s): Embrapa Gado de Corte. |
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| Registros recuperados : 24 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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