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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
20/04/2009 |
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Data da última atualização: |
29/07/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PAGLIARINI, M. S.; RISSO-PASCOTTO, C.; SOUZA-KANESHIMA, A. M. de; VALLE, C. B. do. |
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Afiliação: |
Maria Suely Pagliarini, UEM; Claudicéia Risso-Pascotto, UEM; Alice Maria de Souza-Kaneshima, UEM; Cacilda Borges do Valle, CNPGC. |
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Título: |
Analysis of meiotic behavior in selecting potential genitors among diploid and artificially induced tetraploid accessions of Brachiaria ruziziensis (Poaceae). |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Euphytica, Wageningen, Holanda, v. 164, n.1 , p. 181-187, nov. 2008. |
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Idioma: |
Inglês |
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Conteúdo: |
Sexuality is correlated with diploidy and apomixis with polyploidy in the Brachiaria genus. Brachiaria ruziziensis is a key species in Brachiaria breeding due to its obligate sexuality and intrinsic agronomic qualities. Interspecific crosses in the genus became feasible only when a few diploid accessions of B. ruziziensis were artificially tetraploidized and remained sexual. Hybridization has been done since, using natural tetraploid apomictic accessions of B. brizantha or B. decumbens as pollen donors. Twenty two accessions of B. ruziziensis from the Embrapa Beef Cattle germplasm collection (Campo Grande, MS, Brazil) were cytologically analyzed: 16 are natural diploids (2n = 2x = 18) and six are artificially induced tetraploids (2n = 4x = 36). The meiotic behavior in the 16 diploid accessions varied. The mean of meiotic abnormalities per accession ranged from zero to 24.46%. Meiotic behavior in the induced tetraploid accessions also varied with the mean of meiotic abnormalities ranging from 5.20% to 54.71%. The most common abnormalities observed in both the diploid and the tetraploid accessions, were those related to irregular chromosome segregation. In one tetraploid accession, with a high frequency of those, other irregularities involving chromosome orientation at metaphase plate and chromosome convergence to the poles, a meiotic mutation known as divergent spindle, were recorded. Meiotic behavior should be considered in selecting potential genitors for breeding. |
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Palavras-Chave: |
Braquiária; Brasil; Campo Grande; Mato Grosso do Sul; Microsporogêne. |
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Thesagro: |
Apomixia; Brachiaria Ruziziensis; Citogenética Vegetal; Meiose; Melhoramento Genético Vegetal; Pastagem; Poliploidia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02448naa a2200301 a 4500
001 1326851
005 2011-07-29
008 2008 bl uuuu u00u1 u #d
100 1 $aPAGLIARINI, M. S.
245 $aAnalysis of meiotic behavior in selecting potential genitors among diploid and artificially induced tetraploid accessions of Brachiaria ruziziensis (Poaceae).$h[electronic resource]
260 $c2008
520 $aSexuality is correlated with diploidy and apomixis with polyploidy in the Brachiaria genus. Brachiaria ruziziensis is a key species in Brachiaria breeding due to its obligate sexuality and intrinsic agronomic qualities. Interspecific crosses in the genus became feasible only when a few diploid accessions of B. ruziziensis were artificially tetraploidized and remained sexual. Hybridization has been done since, using natural tetraploid apomictic accessions of B. brizantha or B. decumbens as pollen donors. Twenty two accessions of B. ruziziensis from the Embrapa Beef Cattle germplasm collection (Campo Grande, MS, Brazil) were cytologically analyzed: 16 are natural diploids (2n = 2x = 18) and six are artificially induced tetraploids (2n = 4x = 36). The meiotic behavior in the 16 diploid accessions varied. The mean of meiotic abnormalities per accession ranged from zero to 24.46%. Meiotic behavior in the induced tetraploid accessions also varied with the mean of meiotic abnormalities ranging from 5.20% to 54.71%. The most common abnormalities observed in both the diploid and the tetraploid accessions, were those related to irregular chromosome segregation. In one tetraploid accession, with a high frequency of those, other irregularities involving chromosome orientation at metaphase plate and chromosome convergence to the poles, a meiotic mutation known as divergent spindle, were recorded. Meiotic behavior should be considered in selecting potential genitors for breeding.
650 $aApomixia
650 $aBrachiaria Ruziziensis
650 $aCitogenética Vegetal
650 $aMeiose
650 $aMelhoramento Genético Vegetal
650 $aPastagem
650 $aPoliploidia
653 $aBraquiária
653 $aBrasil
653 $aCampo Grande
653 $aMato Grosso do Sul
653 $aMicrosporogêne
700 1 $aRISSO-PASCOTTO, C.
700 1 $aSOUZA-KANESHIMA, A. M. de
700 1 $aVALLE, C. B. do
773 $tEuphytica, Wageningen, Holanda$gv. 164, n.1 , p. 181-187, nov. 2008.
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| 20. |  | ANDRADE, D. F. de A. A.; LAMAS, F. M.; FORTUNA, P. A. Comportamento de cultivares/linhagens de algodoeiro frente a ocorrencia de doencas em Chapadao do Sul, MS, safra 1998/99. In: CONGRESSO BRASILEIRO DE ALGODAO, 2., 1999, Ribeiro Preto, SP. O Algodao no seculo XX, perspectivas para o seculo XXI: anais. p.458-460| Biblioteca(s): Embrapa Agropecuária Oeste. |
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