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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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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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Registro original: |
Embrapa Acre (CPAF-AC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
19/02/2018 |
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Data da última atualização: |
19/02/2018 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
BARIONI, L. G.; SILVA, R. de O.; FASIABEN, M. do C. R.; MEDEIROS, S. R. de. |
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Afiliação: |
LUIS GUSTAVO BARIONI, CNPTIA; Rafael de Oliveira Silva, Research Division, SRUC; MARIA DO CARMO RAMOS FASIABEN, CNPTIA; SERGIO RAPOSO DE MEDEIROS, CNPGC. |
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Título: |
Fitting Brazilian livestock production to changes in natural and political environments. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
In: ANNUAL MEETING OF THE BRAZILIAN SOCIETY OF ANIMAL SCIENCE, 52., 2017, Foz do Iguaçu. A new view of animal science: challenges and perspectives: proceedings. Foz do Iguaçu: SBZ: UFPR, 2017. |
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Páginas: |
p. 146-163. |
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ISSN: |
1983-4357 |
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Idioma: |
Inglês |
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Conteúdo: |
Cattle production is the human activity with largest land use. Rises in demand for cattle products and steady or lower grasslands availability are projected, impelling high rates of productivity gain. However, greater pasture production seasonality in the main producing regions will challenge exclusive pasture-fed production in Brazil. Recovery of degraded pastureland, increasing feed supplementation and feedlots, and integration of livestock production with annual crops, forestry and ethanol agroindustry are promising strategies sustainable intensification under climate change. Digital transformation empowers society to influence public policies and products chains, rapidly changing production constraints and increasing demand for information from production systems. In this context, reducing vulnerability in the international market will demand national institutions and research teams to take part on international initiatives to produce new metrics, models, methods and analysis, which have the potential to affect the cattle industry. Lack of digital literacy of smallholder farmers in remote areas is also seen as an vulnerability, because of their reduced capacity to respond to this new connected environment. |
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Palavras-Chave: |
Crop-Livestock systems; Livestock farming. |
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Thesagro: |
Agricultura sustentável; Gado de corte; Pecuária. |
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Thesaurus NAL: |
Beef cattle; Sustainable agricultural intensification; Sustainable agriculture. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/171707/1/PL-Fitting-Barioni-etal.pdf
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Marc: |
LEADER 02191nam a2200265 a 4500
001 2087829
005 2018-02-19
008 2017 bl uuuu u01u1 u #d
022 $a1983-4357
100 1 $aBARIONI, L. G.
245 $aFitting Brazilian livestock production to changes in natural and political environments.$h[electronic resource]
260 $aIn: ANNUAL MEETING OF THE BRAZILIAN SOCIETY OF ANIMAL SCIENCE, 52., 2017, Foz do Iguaçu. A new view of animal science: challenges and perspectives: proceedings. Foz do Iguaçu: SBZ: UFPR$c2017
300 $ap. 146-163.
520 $aCattle production is the human activity with largest land use. Rises in demand for cattle products and steady or lower grasslands availability are projected, impelling high rates of productivity gain. However, greater pasture production seasonality in the main producing regions will challenge exclusive pasture-fed production in Brazil. Recovery of degraded pastureland, increasing feed supplementation and feedlots, and integration of livestock production with annual crops, forestry and ethanol agroindustry are promising strategies sustainable intensification under climate change. Digital transformation empowers society to influence public policies and products chains, rapidly changing production constraints and increasing demand for information from production systems. In this context, reducing vulnerability in the international market will demand national institutions and research teams to take part on international initiatives to produce new metrics, models, methods and analysis, which have the potential to affect the cattle industry. Lack of digital literacy of smallholder farmers in remote areas is also seen as an vulnerability, because of their reduced capacity to respond to this new connected environment.
650 $aBeef cattle
650 $aSustainable agricultural intensification
650 $aSustainable agriculture
650 $aAgricultura sustentável
650 $aGado de corte
650 $aPecuária
653 $aCrop-Livestock systems
653 $aLivestock farming
700 1 $aSILVA, R. de O.
700 1 $aFASIABEN, M. do C. R.
700 1 $aMEDEIROS, S. R. de
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