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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
30/03/2011 |
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Data da última atualização: |
03/05/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SOUZA-KANESHIMA, A. M. de; SIMIONI, C.; FELISMINO, M. F.; MENDES-BONATO, A. B.; RISSO-PASCOTTO, C.; PESSIM, C.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
A. M. DE SOUZA-KANESHIMA, Department of Cell Biology and Genetics, State University of Maringa´ , 87020-900 Maringa´ PR; C. SIMIONI, Department of Forage Plants, Federal University of Rio Grande do Sul, 91501-970 Porto Alegre RS; M. F. FELISMINO, Department of Cell Biology and Genetics, State University of Maringá , 87020-900 Maringá PR; A. B. MENDES-BONATO, Department of Cell Biology and Genetics, State University of Maringá , 87020-900 Maringá, PR; C. RISSO-PASCOTTO, Department of Cell Biology and Genetics, State University of Maringá , 87020-900 Maringá PR; C. PESSIM, Department of Cell Biology and Genetics, State University of Maringá , 87020-900 Maringá PR; M. S. PAGLIARINI, Department of Cell Biology and Genetics, State University of Maringá, 87020-900 Maringá, PR; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Meiotic behaviour in the first interspecific hybrids between Brachiaria brizantha and Brachiaria decumbens. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Plant Breeding, v. 129, n. 2, p. 186-191, 2010. |
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Idioma: |
Inglês |
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Conteúdo: |
Brachiaria brizantha and Brachiaria decumbens constitute the two most widely used tropical forage species for cultivated pastures and support both beef and dairy cattle production in the tropics. Two apomictic cultivars ? B. brizantha cv. Marandu and B. decumbens cv. Basilisk ? cover more than 100 million hectares of cultivated pastures throughout Latin America and Southeast Asia. This paper discusses the cytogenetic data of the first successful attempt in obtaining interspecific hybrids between these two species. Artificial hybridization between two diploid (2n = 2x = 18) sexual accessions (B. brizantha, B105 · B. decumbens, D004) was performed in the greenhouse. Only
three hybrids were recovered. One of them was treated with colchicine in tissue culture and two amphidiploid plants were obtained. Meiosis in the diploid genitors was quite normal, while in the diploid hybrid parental genome separation was observed together with some irregular chromosome segregation. Genome separation was also observed in several cells in the two 4n amphidiploid hybrids. In these, a high number of meiocytes with chromosomes chaotically spread in the cytoplasm was recorded during meiosis. The abnormalities observed compromised the meiotic products characterized by polyads. Chromosomes associated generally as bivalents but some association as quadrivalents in diakinesis in one of the amphidiploid hybrids indicates taxonomic proximity between these two species. Moreover, it indicates that introgression of desirable genes may be feasible between these two most important agronomic species of the genus. MenosBrachiaria brizantha and Brachiaria decumbens constitute the two most widely used tropical forage species for cultivated pastures and support both beef and dairy cattle production in the tropics. Two apomictic cultivars ? B. brizantha cv. Marandu and B. decumbens cv. Basilisk ? cover more than 100 million hectares of cultivated pastures throughout Latin America and Southeast Asia. This paper discusses the cytogenetic data of the first successful attempt in obtaining interspecific hybrids between these two species. Artificial hybridization between two diploid (2n = 2x = 18) sexual accessions (B. brizantha, B105 · B. decumbens, D004) was performed in the greenhouse. Only
three hybrids were recovered. One of them was treated with colchicine in tissue culture and two amphidiploid plants were obtained. Meiosis in the diploid genitors was quite normal, while in the diploid hybrid parental genome separation was observed together with some irregular chromosome segregation. Genome separation was also observed in several cells in the two 4n amphidiploid hybrids. In these, a high number of meiocytes with chromosomes chaotically spread in the cytoplasm was recorded during meiosis. The abnormalities observed compromised the meiotic products characterized by polyads. Chromosomes associated generally as bivalents but some association as quadrivalents in diakinesis in one of the amphidiploid hybrids indicates taxonomic proximity between these two species. Moreover, it indicates that introgr... Mostrar Tudo |
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Palavras-Chave: |
Chaotic spindle; Duplicação de cromossomos; Híbridos interespecíficos. |
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Thesagro: |
Brachiaria Brizantha; Brachiaria Decumbens; Meiose. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02439naa a2200277 a 4500
001 1883907
005 2011-05-03
008 2010 bl --- 0-- u #d
100 1 $aSOUZA-KANESHIMA, A. M. de
245 $aMeiotic behaviour in the first interspecific hybrids between Brachiaria brizantha and Brachiaria decumbens.
260 $c2010
520 $aBrachiaria brizantha and Brachiaria decumbens constitute the two most widely used tropical forage species for cultivated pastures and support both beef and dairy cattle production in the tropics. Two apomictic cultivars ? B. brizantha cv. Marandu and B. decumbens cv. Basilisk ? cover more than 100 million hectares of cultivated pastures throughout Latin America and Southeast Asia. This paper discusses the cytogenetic data of the first successful attempt in obtaining interspecific hybrids between these two species. Artificial hybridization between two diploid (2n = 2x = 18) sexual accessions (B. brizantha, B105 · B. decumbens, D004) was performed in the greenhouse. Only three hybrids were recovered. One of them was treated with colchicine in tissue culture and two amphidiploid plants were obtained. Meiosis in the diploid genitors was quite normal, while in the diploid hybrid parental genome separation was observed together with some irregular chromosome segregation. Genome separation was also observed in several cells in the two 4n amphidiploid hybrids. In these, a high number of meiocytes with chromosomes chaotically spread in the cytoplasm was recorded during meiosis. The abnormalities observed compromised the meiotic products characterized by polyads. Chromosomes associated generally as bivalents but some association as quadrivalents in diakinesis in one of the amphidiploid hybrids indicates taxonomic proximity between these two species. Moreover, it indicates that introgression of desirable genes may be feasible between these two most important agronomic species of the genus.
650 $aBrachiaria Brizantha
650 $aBrachiaria Decumbens
650 $aMeiose
653 $aChaotic spindle
653 $aDuplicação de cromossomos
653 $aHíbridos interespecíficos
700 1 $aSIMIONI, C.
700 1 $aFELISMINO, M. F.
700 1 $aMENDES-BONATO, A. B.
700 1 $aRISSO-PASCOTTO, C.
700 1 $aPESSIM, C.
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tPlant Breeding$gv. 129, n. 2, p. 186-191, 2010.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
30/11/1993 |
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Data da última atualização: |
14/04/2014 |
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Autoria: |
COCHRANE, T. T.; MADEIRA NETTO, J. da S. (ed.). |
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Título: |
A deficiencia da precipitacao e a evapotranspiracao potencial do Brasil: um resumo dos dados climaticos preliminares armazenados no banco de dados dos estudos de recursos das terras da Embrapa-CPAC. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Planaltina: Embrapa-CPAC, 1985. |
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Páginas: |
95 p. |
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Série: |
(Embrapa-CPAC. Documentos, 12). |
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Idioma: |
Português |
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Notas: |
Extraido dos dados compilados originalmente por J.K. Hancock, R.W. Hill e G.H. Hargreaves. |
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Conteúdo: |
Metodologia e definições. A estação úmida. Apresentação das tabelas dos dados meteorológicos. Distribuição de estações meteorológicas. Dados meteorológicos. Amazônia. Nordeste, Centro-Oeste. Centro-Leste. Sudeste. |
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Palavras-Chave: |
Brasil; Climatologia agrícola; Evapotranspiração potencial; Precipitação; Precipitation; Savanna. |
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Thesagro: |
Cerrado; Deficiência; Evapotranspiração; Meteorologia. |
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Thesaurus NAL: |
Brazil; climatology; evapotranspiration; meteorology. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/101042/1/doc-12.pdf
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/101041/1/doc-12.pdf
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Marc: |
LEADER 01303nam a2200325 a 4500
001 1567274
005 2014-04-14
008 1985 bl uuuu 00u1 u #d
100 1 $aCOCHRANE, T. T.
245 $aA deficiencia da precipitacao e a evapotranspiracao potencial do Brasil$bum resumo dos dados climaticos preliminares armazenados no banco de dados dos estudos de recursos das terras da Embrapa-CPAC.
260 $aPlanaltina: Embrapa-CPAC$c1985
300 $a95 p.
490 $a(Embrapa-CPAC. Documentos, 12).
500 $aExtraido dos dados compilados originalmente por J.K. Hancock, R.W. Hill e G.H. Hargreaves.
520 $aMetodologia e definições. A estação úmida. Apresentação das tabelas dos dados meteorológicos. Distribuição de estações meteorológicas. Dados meteorológicos. Amazônia. Nordeste, Centro-Oeste. Centro-Leste. Sudeste.
650 $aBrazil
650 $aclimatology
650 $aevapotranspiration
650 $ameteorology
650 $aCerrado
650 $aDeficiência
650 $aEvapotranspiração
650 $aMeteorologia
653 $aBrasil
653 $aClimatologia agrícola
653 $aEvapotranspiração potencial
653 $aPrecipitação
653 $aPrecipitation
653 $aSavanna
700 1 $aMADEIRA NETTO, J. da S.
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Embrapa Cerrados (CPAC) |
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