Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding.
Autor(a) principal: | |
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Data de Publicação: | 2011 |
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/897402 |
Resumo: | Brachiaria humidicola is a grass adapted to seasonally swampy grasslands in Africa; two cultivars, ?common? and Llanero, are widely used in Brazilian pastures. New cultivars are in great demand in order to diversify current production systems to achieve improved quality and yield. Cytological analyses of 55 accessions of this species available from the Embrapa Beef Cattle germplasm collection revealed that 27 are apomictic and have 2n = 54 chromosomes. Chromosome pairing as bi- to nonavalent associations at diakinesis indicated a basic chromosome number in this species of x = 6, as found in other closely related Brachiaria species. Thus, these 27 accessions are nonaploid (2n = 9x = 54). Abnormalities were found in the meiosis of these accessions, at variable frequencies. The most common abnormalities were those related to irregular chromosome segregation, which led to unbalanced gamete formation; but chromosome stickiness, cell fusion, and absence of cytokinesis were also recorded. Although some accessions have a low frequency of meiotic abnormalities, ensuring potentially good pollen viability, these cannot be used in hybridization due to a lack of sexual accessions with the same ploidy level. |
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Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding.Brachiaria HumidicolaGramínea ForrageiraMelhoramento Genético VegetalPastagemBrachiaria humidicola is a grass adapted to seasonally swampy grasslands in Africa; two cultivars, ?common? and Llanero, are widely used in Brazilian pastures. New cultivars are in great demand in order to diversify current production systems to achieve improved quality and yield. Cytological analyses of 55 accessions of this species available from the Embrapa Beef Cattle germplasm collection revealed that 27 are apomictic and have 2n = 54 chromosomes. Chromosome pairing as bi- to nonavalent associations at diakinesis indicated a basic chromosome number in this species of x = 6, as found in other closely related Brachiaria species. Thus, these 27 accessions are nonaploid (2n = 9x = 54). Abnormalities were found in the meiosis of these accessions, at variable frequencies. The most common abnormalities were those related to irregular chromosome segregation, which led to unbalanced gamete formation; but chromosome stickiness, cell fusion, and absence of cytokinesis were also recorded. Although some accessions have a low frequency of meiotic abnormalities, ensuring potentially good pollen viability, these cannot be used in hybridization due to a lack of sexual accessions with the same ploidy level.K. R. BOLDRINI, 1Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá; E.V. Adamowski, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; N. Silva, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; M.S. Pagliarini, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; CACILDA BORGES DO VALLE, CNPGC.BOLDRINI, K. R.ADAMOWSKI, E. V.SILVA, N.PAGLIARINI, M. S.VALLE, C. B. do2011-08-05T11:11:11Z2011-08-05T11:11:11Z2011-08-05T11:11:11Z2011-08-05T11:11:11Z2011-08-0520112011-08-05T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleGenetics and Molecular Research, v. 10, n.1, p. 169-176, 2011.http://www.alice.cnptia.embrapa.br/alice/handle/doc/897402enginfo: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:EMBRAPA2017-08-15T23:00:14Zoai:www.alice.cnptia.embrapa.br:doc/897402Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-15T23:00:14falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-15T23:00:14Repositório 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 |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. |
title |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. |
spellingShingle |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. BOLDRINI, K. R. Brachiaria Humidicola Gramínea Forrageira Melhoramento Genético Vegetal Pastagem |
title_short |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. |
title_full |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. |
title_fullStr |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. |
title_full_unstemmed |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. |
title_sort |
Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. |
author |
BOLDRINI, K. R. |
author_facet |
BOLDRINI, K. R. ADAMOWSKI, E. V. SILVA, N. PAGLIARINI, M. S. VALLE, C. B. do |
author_role |
author |
author2 |
ADAMOWSKI, E. V. SILVA, N. PAGLIARINI, M. S. VALLE, C. B. do |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
K. R. BOLDRINI, 1Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá; E.V. Adamowski, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; N. Silva, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; M.S. Pagliarini, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; CACILDA BORGES DO VALLE, CNPGC. |
dc.contributor.author.fl_str_mv |
BOLDRINI, K. R. ADAMOWSKI, E. V. SILVA, N. PAGLIARINI, M. S. VALLE, C. B. do |
dc.subject.por.fl_str_mv |
Brachiaria Humidicola Gramínea Forrageira Melhoramento Genético Vegetal Pastagem |
topic |
Brachiaria Humidicola Gramínea Forrageira Melhoramento Genético Vegetal Pastagem |
description |
Brachiaria humidicola is a grass adapted to seasonally swampy grasslands in Africa; two cultivars, ?common? and Llanero, are widely used in Brazilian pastures. New cultivars are in great demand in order to diversify current production systems to achieve improved quality and yield. Cytological analyses of 55 accessions of this species available from the Embrapa Beef Cattle germplasm collection revealed that 27 are apomictic and have 2n = 54 chromosomes. Chromosome pairing as bi- to nonavalent associations at diakinesis indicated a basic chromosome number in this species of x = 6, as found in other closely related Brachiaria species. Thus, these 27 accessions are nonaploid (2n = 9x = 54). Abnormalities were found in the meiosis of these accessions, at variable frequencies. The most common abnormalities were those related to irregular chromosome segregation, which led to unbalanced gamete formation; but chromosome stickiness, cell fusion, and absence of cytokinesis were also recorded. Although some accessions have a low frequency of meiotic abnormalities, ensuring potentially good pollen viability, these cannot be used in hybridization due to a lack of sexual accessions with the same ploidy level. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-08-05T11:11:11Z 2011-08-05T11:11:11Z 2011-08-05T11:11:11Z 2011-08-05T11:11:11Z 2011-08-05 2011 2011-08-05T11:11:11Z |
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 |
Genetics and Molecular Research, v. 10, n.1, p. 169-176, 2011. http://www.alice.cnptia.embrapa.br/alice/handle/doc/897402 |
identifier_str_mv |
Genetics and Molecular Research, v. 10, n.1, p. 169-176, 2011. |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/897402 |
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 |
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Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
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EMBRAPA |
institution |
EMBRAPA |
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Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
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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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1794503347325108224 |