Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones.
Autor(a) principal: | |
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Data de Publicação: | 1995 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
Texto Completo: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/492133 |
Resumo: | 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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Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones.Clone híbridoSolanum tuberosum LHíbridosFitomejoramientoPatatasPlant breendigRetrocruzamientoMelhoramento genético vegetalBatataRetrocruzamentoProgenie híbridaPotatoesHybridsBackcrossingSolanum chacoenseThe 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.MARCELO NASCIMENTO DE OLIVEIRA, CPAC; Lisete Chama Davide, Ufla; César Augusto Brasil Pereira Pinto, Ufla.OLIVEIRA, M. N. deDAVIDE, L. C.PINTO, C. A. B. P.2017-02-08T23:02:26Z2017-02-08T23:02:26Z1996-08-1519952019-01-04T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleBrazilian Journal of Genetics, v. 18, n. 3, p. 445-450, 1995.0100-8455http://www.alice.cnptia.embrapa.br/alice/handle/doc/492133enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-16T04:08:31Zoai:www.alice.cnptia.embrapa.br:doc/492133Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-16T04:08:31falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-16T04:08:31Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. |
title |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. |
spellingShingle |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. OLIVEIRA, M. N. de Clone híbrido Solanum tuberosum L Híbridos Fitomejoramiento Patatas Plant breendig Retrocruzamiento Melhoramento genético vegetal Batata Retrocruzamento Progenie híbrida Potatoes Hybrids Backcrossing Solanum chacoense |
title_short |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. |
title_full |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. |
title_fullStr |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. |
title_full_unstemmed |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. |
title_sort |
Mechanisms of 2n potato pollen formation in dihaploid Solanum tuberosum L. x S. chacoense Bitt. hybrid clones. |
author |
OLIVEIRA, M. N. de |
author_facet |
OLIVEIRA, M. N. de DAVIDE, L. C. PINTO, C. A. B. P. |
author_role |
author |
author2 |
DAVIDE, L. C. PINTO, C. A. B. P. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
MARCELO NASCIMENTO DE OLIVEIRA, CPAC; Lisete Chama Davide, Ufla; César Augusto Brasil Pereira Pinto, Ufla. |
dc.contributor.author.fl_str_mv |
OLIVEIRA, M. N. de DAVIDE, L. C. PINTO, C. A. B. P. |
dc.subject.por.fl_str_mv |
Clone híbrido Solanum tuberosum L Híbridos Fitomejoramiento Patatas Plant breendig Retrocruzamiento Melhoramento genético vegetal Batata Retrocruzamento Progenie híbrida Potatoes Hybrids Backcrossing Solanum chacoense |
topic |
Clone híbrido Solanum tuberosum L Híbridos Fitomejoramiento Patatas Plant breendig Retrocruzamiento Melhoramento genético vegetal Batata Retrocruzamento Progenie híbrida Potatoes Hybrids Backcrossing Solanum chacoense |
description |
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. |
publishDate |
1995 |
dc.date.none.fl_str_mv |
1995 1996-08-15 2017-02-08T23:02:26Z 2017-02-08T23:02:26Z 2019-01-04T11:11:11Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Brazilian Journal of Genetics, v. 18, n. 3, p. 445-450, 1995. 0100-8455 http://www.alice.cnptia.embrapa.br/alice/handle/doc/492133 |
identifier_str_mv |
Brazilian Journal of Genetics, v. 18, n. 3, p. 445-450, 1995. 0100-8455 |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/492133 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
collection |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
repository.name.fl_str_mv |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
cg-riaa@embrapa.br |
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1794503431889616896 |