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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
05/08/2011 |
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Data da última atualização: |
05/08/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BOLDRINI, K. R.; ADAMOWSKI, E. V.; SILVA, N.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
K. R. BOLDRINI, 1Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá; E.V. Adamowski, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; N. Silva, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; M.S. Pagliarini, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Genetics and Molecular Research, v. 10, n.1, p. 169-176, 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
Brachiaria humidicola is a grass adapted to seasonally swampy grasslands in Africa; two cultivars, ?common? and Llanero, are widely used in Brazilian pastures. New cultivars are in great demand in order to diversify current production systems to achieve improved quality and yield. Cytological analyses of 55 accessions of this species available from the Embrapa Beef Cattle germplasm collection revealed that 27 are apomictic and have 2n = 54 chromosomes. Chromosome pairing as bi- to nonavalent associations at diakinesis indicated a basic chromosome number in this species of x = 6, as found in other closely related Brachiaria species. Thus, these 27 accessions are nonaploid (2n = 9x = 54). Abnormalities were found in the meiosis of these accessions, at variable frequencies. The most common abnormalities were those related to irregular chromosome segregation, which led to unbalanced gamete formation; but chromosome stickiness, cell fusion, and absence of cytokinesis were also recorded. Although some accessions have a low frequency of meiotic abnormalities, ensuring potentially good pollen viability, these cannot be used in hybridization due to a lack of sexual accessions with the same ploidy level. |
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Thesagro: |
Brachiaria Humidicola; Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/39333/1/gmr990.pdf
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Marc: |
LEADER 01902naa a2200217 a 4500
001 1897402
005 2011-08-05
008 2011 bl uuuu u00u1 u #d
100 1 $aBOLDRINI, K. R.
245 $aMeiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding.$h[electronic resource]
260 $c2011
520 $aBrachiaria humidicola is a grass adapted to seasonally swampy grasslands in Africa; two cultivars, ?common? and Llanero, are widely used in Brazilian pastures. New cultivars are in great demand in order to diversify current production systems to achieve improved quality and yield. Cytological analyses of 55 accessions of this species available from the Embrapa Beef Cattle germplasm collection revealed that 27 are apomictic and have 2n = 54 chromosomes. Chromosome pairing as bi- to nonavalent associations at diakinesis indicated a basic chromosome number in this species of x = 6, as found in other closely related Brachiaria species. Thus, these 27 accessions are nonaploid (2n = 9x = 54). Abnormalities were found in the meiosis of these accessions, at variable frequencies. The most common abnormalities were those related to irregular chromosome segregation, which led to unbalanced gamete formation; but chromosome stickiness, cell fusion, and absence of cytokinesis were also recorded. Although some accessions have a low frequency of meiotic abnormalities, ensuring potentially good pollen viability, these cannot be used in hybridization due to a lack of sexual accessions with the same ploidy level.
650 $aBrachiaria Humidicola
650 $aGramínea Forrageira
650 $aMelhoramento Genético Vegetal
650 $aPastagem
700 1 $aADAMOWSKI, E. V.
700 1 $aSILVA, N.
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tGenetics and Molecular Research$gv. 10, n.1, p. 169-176, 2011.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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| 2. |  | LÜHRS, L.; SOUSA, V. A. de; ROSSINI, B. C.; KESTRING, D. R.; AGUIAR, A. V. de. Identificação de microssatélites e síntese de primes para erva-mate a partir de programas de bioinformática. In: EVENTOS ARAUCÁRIA: PESQUISA, INOVAÇÃO E TECNOLOGIAS PARA SISTEMAS DE PRODUÇÃO, ERVA-MATE XXI: INOVAÇÃO E TECNOLOGIAS PARA O SETOR ERVATEIRO, 2020, Colombo. Anais. Colombo: Embrapa Florestas, 2021. p. 50. (Embrapa Florestas. Documentos, 344). Resumo.| Tipo: Resumo em Anais de Congresso |
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