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| Registros recuperados : 166 | |
| Registros recuperados : 166 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Acre. |
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Data corrente: |
15/08/1996 |
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Data da última atualização: |
28/06/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Nacional - A |
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Autoria: |
OLIVEIRA, M. N. de; DAVIDE, L. C.; PINTO, C. A. B. P. |
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Afiliação: |
MARCELO NASCIMENTO DE OLIVEIRA, CPAC; Lisete Chama Davide, Ufla; César Augusto Brasil Pereira Pinto, Ufla. |
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Título: |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
Brazilian Journal of Genetics, v. 18, n. 3, p. 445-450, 1995. |
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ISSN: |
0100-8455 |
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Idioma: |
Inglês |
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Conteúdo: |
The backcrosses of dihaploid Solanum tuberosum with wild species hybrids generating tetraploids progenies require the formation of non-reduced pollen. In this work, the mechanisms responsible for the formation of 2n pollen in 28 dihaploid Solanum tuberosum x Solanum chacoense hybrids were studied. Four mechanisms were found: parallelspindles (ps), fused spindles (fs), premature cytokinesis-1 (pc-1) and premature cytokinesis-2 (pc-2). The ps mechanism was the most frequent, being found in 23 of the 28 assessed clones. The ps and fs mechanisms led to the formation of dyads by first division restitution (FDR), transferring about 80% of the heterozygosity to the progenies. The pc-1 and pc-2 mechanisms also led to the formation of dyads, but they were genetically equivalent to second division restitution (SDR), transferring only 40% of the heterozygosity to the progenies. Occurrence of FDR and SDR were shown to be associated in 12 clones, indicating that the clones can produce non-reduced microspores by more than one mechanism. However, only one mechanism is functional in a single pollen-grain mother-cell. Clones 9-2, 9-3, 9-6 and 15-15 are recommended for use in 4x x 2x matings. |
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Palavras-Chave: |
Clone híbrido; Fitomejoramiento; Híbridos; Patatas; Plant breendig; Retrocruzamiento; Solanum tuberosum L. |
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Thesagro: |
Batata; Melhoramento genético vegetal; Progenie híbrida; Retrocruzamento. |
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Thesaurus NAL: |
Backcrossing; Hybrids; Potatoes; Solanum chacoense. |
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Categoria do assunto: |
G Melhoramento Genético |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/154934/1/890.pdf
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Marc: |
LEADER 02169naa a2200337 a 4500
001 1492133
005 2021-06-28
008 1995 bl uuuu u00u1 u #d
022 $a0100-8455
100 1 $aOLIVEIRA, M. N. de
245 $aMechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones.$h[electronic resource]
260 $c1995
520 $aThe backcrosses of dihaploid Solanum tuberosum with wild species hybrids generating tetraploids progenies require the formation of non-reduced pollen. In this work, the mechanisms responsible for the formation of 2n pollen in 28 dihaploid Solanum tuberosum x Solanum chacoense hybrids were studied. Four mechanisms were found: parallelspindles (ps), fused spindles (fs), premature cytokinesis-1 (pc-1) and premature cytokinesis-2 (pc-2). The ps mechanism was the most frequent, being found in 23 of the 28 assessed clones. The ps and fs mechanisms led to the formation of dyads by first division restitution (FDR), transferring about 80% of the heterozygosity to the progenies. The pc-1 and pc-2 mechanisms also led to the formation of dyads, but they were genetically equivalent to second division restitution (SDR), transferring only 40% of the heterozygosity to the progenies. Occurrence of FDR and SDR were shown to be associated in 12 clones, indicating that the clones can produce non-reduced microspores by more than one mechanism. However, only one mechanism is functional in a single pollen-grain mother-cell. Clones 9-2, 9-3, 9-6 and 15-15 are recommended for use in 4x x 2x matings.
650 $aBackcrossing
650 $aHybrids
650 $aPotatoes
650 $aSolanum chacoense
650 $aBatata
650 $aMelhoramento genético vegetal
650 $aProgenie híbrida
650 $aRetrocruzamento
653 $aClone híbrido
653 $aFitomejoramiento
653 $aHíbridos
653 $aPatatas
653 $aPlant breendig
653 $aRetrocruzamiento
653 $aSolanum tuberosum L
700 1 $aDAVIDE, L. C.
700 1 $aPINTO, C. A. B. P.
773 $tBrazilian Journal of Genetics$gv. 18, n. 3, p. 445-450, 1995.
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Embrapa Acre (CPAF-AC) |
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