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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
01/02/2008 |
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Data da última atualização: |
19/06/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MENDES-BONATO, A. B.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
ANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Meiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae: Paniceae). |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Brazilian Archives of Biology and Technology, v. 50, n. 5, p. 831-837, Sep. 2007. |
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DOI: |
https://doi.org/10.1590/S1516-89132007000500011 |
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Idioma: |
Inglês |
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Conteúdo: |
Microsporogenesis was analyzed in an interspecific hybrid between an artificially tetraploidized sexual accession of Brachiaria ruziziensis (2n=4x=36) and a natural apomictic tetraploid accession of B. decumbens. Syncytes involving a large number of cells were recorded in 15.4% of meiocytes. Meiosis progressed normally in syncytes during prophase I; in metaphase I, however, several nuclei were found fusioned, showing chromosome stickiness and several chromosome fragments. Meiosis was arrested in metaphase I and pycnotic nuclei and micronuclei were formed. Abnormal cytokinesis fractionated the syncyte into abnormal meiotic products that were covered by the pollen wall. Meiocytes in leptotene were recorded in all the slides prepared for both meiotic divisions, and abnormal ?pollen grains? with well-developed pollen wall but containing leptotene nuclei were recorded in 9.18% of grains analyzed. These findings suggested that the meiocytes received the signal to enter meiosis but lacked the signal to proceed beyond leptotene. Despite the absence of the meiotic process, such cells were covered by pollen grain wall. Total pollen sterility resulted from these abnormalities combined with still others observed among meiocytes. |
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Thesagro: |
Apomixia; Brachiaria Decumbens; Brachiaria Ruziziensis; Citogenética Vegetal; Esterilidade; Fertilidade; Gramínea Forrageira; Hibridação; Hibrido; Melhoramento Genético Vegetal; Planta Forrageira; Pólen. |
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Thesaurus Nal: |
Cell fusion; Cytogenetics; Hybridization; Hybrids; Microsporogenesis; Plant breeding; Poaceae; Pollination. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/326408/1/Meiotic-arrest-compromises-pollen-2007.pdf
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Marc: |
LEADER 02446naa a2200397 a 4500
001 1326408
005 2023-06-19
008 2007 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1590/S1516-89132007000500011$2DOI
100 1 $aMENDES-BONATO, A. B.
245 $aMeiotic arrest compromises pollen fertility in an interspecific hybrid between Brachiaria ruziziensis x Brachiaria decumbens (Poaceae$bPaniceae).
260 $c2007
520 $aMicrosporogenesis was analyzed in an interspecific hybrid between an artificially tetraploidized sexual accession of Brachiaria ruziziensis (2n=4x=36) and a natural apomictic tetraploid accession of B. decumbens. Syncytes involving a large number of cells were recorded in 15.4% of meiocytes. Meiosis progressed normally in syncytes during prophase I; in metaphase I, however, several nuclei were found fusioned, showing chromosome stickiness and several chromosome fragments. Meiosis was arrested in metaphase I and pycnotic nuclei and micronuclei were formed. Abnormal cytokinesis fractionated the syncyte into abnormal meiotic products that were covered by the pollen wall. Meiocytes in leptotene were recorded in all the slides prepared for both meiotic divisions, and abnormal ?pollen grains? with well-developed pollen wall but containing leptotene nuclei were recorded in 9.18% of grains analyzed. These findings suggested that the meiocytes received the signal to enter meiosis but lacked the signal to proceed beyond leptotene. Despite the absence of the meiotic process, such cells were covered by pollen grain wall. Total pollen sterility resulted from these abnormalities combined with still others observed among meiocytes.
650 $aCell fusion
650 $aCytogenetics
650 $aHybridization
650 $aHybrids
650 $aMicrosporogenesis
650 $aPlant breeding
650 $aPoaceae
650 $aPollination
650 $aApomixia
650 $aBrachiaria Decumbens
650 $aBrachiaria Ruziziensis
650 $aCitogenética Vegetal
650 $aEsterilidade
650 $aFertilidade
650 $aGramínea Forrageira
650 $aHibridação
650 $aHibrido
650 $aMelhoramento Genético Vegetal
650 $aPlanta Forrageira
650 $aPólen
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tBrazilian Archives of Biology and Technology$gv. 50, n. 5, p. 831-837, Sep. 2007.
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Embrapa Gado de Corte (CNPGC) |
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| 1. |  | ALMEIDA, C. D. S. de; SPUZA, D. dos S. de L.; DEL SARTO, R. P.; FIRMINO, A. A. P.; SILVA, T. S.; MAGALHÃES, J. C. C.; GROSSI DE SÁ, M. F.; ROCHA, T. L. Fracionamento de extrato aquoso de sementes de Crotalaria espectabilis efetivo no controle de juvenis de segundo estádio (J2) de Meloidogyne incógnita. Brasília: Embrapa Recursos Genéticos e Biotecnologia, 2008. 11 p. (Embrapa Recursos Genéticos e Biotecnologia. Circular Técnica, 78).| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
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