| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Gado de Corte. |
|
Data corrente: |
30/09/2009 |
|
Data da última atualização: |
20/05/2025 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
MENDES-BONATO, A. B.; JUNQUEIRA FILHO, R. G.; PAGLIARINI, M. S.; VALLE, C. B. do; PENTEADO, M. I. de O. |
|
Afiliação: |
ANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; ROBERTO GARGIONE JUNQUEIRA FILHO, UNIVERSIDADE ESTDUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC; MARIA ISABEL DE OLIVEIRA PENTEADO, SPRI. |
|
Título: |
Unusual cytological patterns of microsporogenesis in Brachiaria decumbens: abnormalities in spindle and defective cytokinesis causing precocious cellularization. |
|
Ano de publicação: |
2002 |
|
Fonte/Imprenta: |
Cell Biology International, v. 26, n. 7, p. 641-646, July 2002. |
|
ISSN: |
1065-6995 |
|
DOI: |
https://doi.org/10.1006/cbir.2002.0929 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Cytogenetic studies carried out in the tetraploid accession BRA001068 of Brachiaria decumbens, also known as cv. Basilisk, revealed an unusual pattern of microsporogenesis. The spindle in metaphase I and anaphase I became heavily stained with propionic carmine. In telophase I, the interzonal microtubules continued to be intensely stained, and during the phragmoplast formation the fibers were pushed to the cell wall, persisting until prophase II, even after cytokinesis. Due to its tetraploid condition, the accession presented many cells with precocious chromosome migration to the poles in metaphase I and laggards in anaphase I that gave rise to micronuclei in telophase I. While in other polyploid accessions of Brachiaria micronuclei remained in this condition until the second cytokinesis, the micronuclei in this accession organized their own spindle in the second division. In several microsporocytes, the micronuclei with their minispindle were divided further into microcytes by additional cytokinesis. Some curious planes of cytokinesis were found in some cells, with partitioning of cytoplasm into cells of irregular shape. The result consisted of a high frequency of abnormal products of meiosis. Quadrivalents were observed in diakinesis at low frequency, which suggests a segmental allotetraploid and the inability of both genomes to co-ordinate their activities, leading to multiple spindle and precocious cellularization. In spite of abnormal meiotic products reducing pollen fertility, seed production was normal. Enough normal pollen was available to fertilize the central-cell nucleus of the embryo sac and produce normal endosperm in this pseudogamous aposporous apomictic accession. MenosCytogenetic studies carried out in the tetraploid accession BRA001068 of Brachiaria decumbens, also known as cv. Basilisk, revealed an unusual pattern of microsporogenesis. The spindle in metaphase I and anaphase I became heavily stained with propionic carmine. In telophase I, the interzonal microtubules continued to be intensely stained, and during the phragmoplast formation the fibers were pushed to the cell wall, persisting until prophase II, even after cytokinesis. Due to its tetraploid condition, the accession presented many cells with precocious chromosome migration to the poles in metaphase I and laggards in anaphase I that gave rise to micronuclei in telophase I. While in other polyploid accessions of Brachiaria micronuclei remained in this condition until the second cytokinesis, the micronuclei in this accession organized their own spindle in the second division. In several microsporocytes, the micronuclei with their minispindle were divided further into microcytes by additional cytokinesis. Some curious planes of cytokinesis were found in some cells, with partitioning of cytoplasm into cells of irregular shape. The result consisted of a high frequency of abnormal products of meiosis. Quadrivalents were observed in diakinesis at low frequency, which suggests a segmental allotetraploid and the inability of both genomes to co-ordinate their activities, leading to multiple spindle and precocious cellularization. In spite of abnormal meiotic products reducing pollen fert... Mostrar Tudo |
|
Palavras-Chave: |
Braquiária; Microsporogênese. |
|
Thesagro: |
Brachiaria Decumbens; Citogenética Vegetal; Gramínea Forrageira; Meiose; Melhoramento Genético Vegetal; Pastagem. |
|
Thesaurus Nal: |
Cytokinesis; Meiosis. |
|
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
|
Marc: |
null
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Gado de Corte (CNPGC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 1 | |
| 1. |  | POLIDORO, J. C.; MENDONÇA-SANTOS, M. de L.; LUMBRERAS, J. F.; COELHO, M. R.; CARVALHO FILHO, A. de; MOTTA, P. E. F. da; CARVALHO JUNIOR, W. de; ARAUJO FILHO, J. C. de; CURCIO, G. R.; CORREIA, J. R.; MARTINS, E. de S.; SPERA, S. T.; OLIVEIRA, S. R. de M.; BOLFE, E. L.; MANZATTO, C. V.; TOSTO, S. G.; VENTURIERI, A.; SA, I. B.; OLIVEIRA, V. A. de; SHINZATO, E.; ANJOS, L. H. C. dos; VALLADARES, G. S.; RIBEIRO, J. L.; MEDEIROS, P. S. C. de; MOREIRA, F. M. de S.; SILVA, L. S. L.; SEQUINATTO, L.; AGLIO, M. L. D.; DART, R. de O. Programa Nacional de Solos do Brasil (PronaSolos). Rio de Janeiro: Embrapa Solos, 2016. 53 p. (Embrapa Solos. Documentos, 183).| Biblioteca(s): Embrapa Agrossilvipastoril; Embrapa Amazônia Oriental; Embrapa Florestas; Embrapa Maranhão; Embrapa Meio Ambiente; Embrapa Semiárido; Embrapa Solos. |
|    |
| Registros recuperados : 1 | |
|
| Expressão de busca inválida. Verifique!!! |
|
|
