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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
09/08/2011 |
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Data da última atualização: |
09/08/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SIMIONI, C.; VALLE, C. B. do. |
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Afiliação: |
Carine Simioni, Universidade Federal do Rio Grande do Sul (UFRGS), Departamento de Plantas Forrageiras e Agrometeorologia; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Crop Breeding and Applied Biotechnology, v.11, n.1, p. 43-49, 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
The meiotic behavior of three tetraploid plants (2n=4x=36) originated from somatic chromosome duplication of sexually reproducing diploid plants of Brachiaria decumbens was evaluated. All the analyzed plants presented abnormalities related to polyploidy, such as irregular chromosome segregation, leading to precocious chromosome migration to the poles and micronuclei during both meiotic divisions. However, the abnormalities observed did not compromise the meiotic products which were characterized by regular tetrads and satisfactory pollen fertility varying from 61.36 to 64.86%. Chromosomes paired mostly as bivalents in diakinesis but univalents to tetravalents were also observed. These studies contributed to the choice of compatible fertile sexual genitors to be crossed to natural tetraploid apomicts in the B. decumbens by identifying abnormalities and verifying pollen fertility. Intraespecific crosses should reduce sterility in the hybrids produced in the breeding program of Brachiaria, a problem observed with the interspecific hybrids produced so far. |
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Thesagro: |
Brachiaria; Melhoramento Genético Vegetal; Pastagem. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 01581naa a2200169 a 4500
001 1897641
005 2011-08-09
008 2011 bl uuuu u00u1 u #d
100 1 $aSIMIONI, C.
245 $aMeiotic analysis in induced tetraploids of Brachiaria decumbens Stapf.$h[electronic resource]
260 $c2011
520 $aThe meiotic behavior of three tetraploid plants (2n=4x=36) originated from somatic chromosome duplication of sexually reproducing diploid plants of Brachiaria decumbens was evaluated. All the analyzed plants presented abnormalities related to polyploidy, such as irregular chromosome segregation, leading to precocious chromosome migration to the poles and micronuclei during both meiotic divisions. However, the abnormalities observed did not compromise the meiotic products which were characterized by regular tetrads and satisfactory pollen fertility varying from 61.36 to 64.86%. Chromosomes paired mostly as bivalents in diakinesis but univalents to tetravalents were also observed. These studies contributed to the choice of compatible fertile sexual genitors to be crossed to natural tetraploid apomicts in the B. decumbens by identifying abnormalities and verifying pollen fertility. Intraespecific crosses should reduce sterility in the hybrids produced in the breeding program of Brachiaria, a problem observed with the interspecific hybrids produced so far.
650 $aBrachiaria
650 $aMelhoramento Genético Vegetal
650 $aPastagem
700 1 $aVALLE, C. B. do
773 $tCrop Breeding and Applied Biotechnology$gv.11, n.1, p. 43-49, 2011.
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| 2. |  | FRAZÃO, D. S.; MARANGUAPE, J. S.; BARROS, P. V. M.; VASCONCELOS, B. F.; SOUSA, A. A.; POMPEU, R. C. F. F. Avaliação morfofisiológica de genótipos de Urochloa mosambicensis sob sombreamento. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA DA EMBRAPA CAPRINOS E OVINOS, 11., 2022, Sobral. Anais... Sobral: Embrapa Caprinos e Ovinos, 2023. p. 52-53. (Embrapa Caprinos e Ovinos. Eventos técnicos & científicos).| Tipo: Resumo em Anais de Congresso |
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