Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae).
Autor(a) principal: | |
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Data de Publicação: | 2009 |
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/661808 |
Resumo: | Brachiaria humidicola (Poaceae), originally from Africa, is an economically important pasture plant in tropical South America. An accession of B. humidicola (H038) collected from the wild African savanna (Mbeya, Tanzania) showed irregular microsporogenesis. This meiotic behavior was consistent with an allopolyploid origin. Multivalent chromosome association at diakinesis gave tri- to octavalents, associated with two nucleoli in some cells. Six non-congregated univalents in metaphase I and anaphase I, along with previous lines of evidence for x = 6 in B. humidicola, confirm H038 as a nonaploid accession, 2n = 9x = 54. Asynchrony in the genome during microsporogenesis also corroborated this assumption. Its putative origin could be a cross between two related species with different rhythms in meiosis. The meiotic behavior of this accession reinforces the hypothesis of the existence of a new basic chromosome number (x = 6) for Brachiaria. The use of this accession in the breeding of this important forage grass for the tropics is discussed. |
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Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae).BraquiáriaBrachiaria HumidicolaGramínea ForrageiraMelhoramento Genético VegetalPastagemBrachiaria humidicola (Poaceae), originally from Africa, is an economically important pasture plant in tropical South America. An accession of B. humidicola (H038) collected from the wild African savanna (Mbeya, Tanzania) showed irregular microsporogenesis. This meiotic behavior was consistent with an allopolyploid origin. Multivalent chromosome association at diakinesis gave tri- to octavalents, associated with two nucleoli in some cells. Six non-congregated univalents in metaphase I and anaphase I, along with previous lines of evidence for x = 6 in B. humidicola, confirm H038 as a nonaploid accession, 2n = 9x = 54. Asynchrony in the genome during microsporogenesis also corroborated this assumption. Its putative origin could be a cross between two related species with different rhythms in meiosis. The meiotic behavior of this accession reinforces the hypothesis of the existence of a new basic chromosome number (x = 6) for Brachiaria. The use of this accession in the breeding of this important forage grass for the tropics is discussed.K. R. BOLDRINI, UEM; M. S. PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC.BOLDRINI, K. R.PAGLIARINI, M. S.VALLE, C. B. do2018-01-29T23:35:17Z2018-01-29T23:35:17Z2010-03-1920092018-01-29T23:35:17Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleGenetics and Molecular Research, v. 8, n.4, p. 1444-1450, 2009.http://www.alice.cnptia.embrapa.br/alice/handle/doc/66180810.4238/vol8-4gmr679enginfo: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:EMBRAPA2018-01-29T23:35:23Zoai:www.alice.cnptia.embrapa.br:doc/661808Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542018-01-29T23:35:23falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542018-01-29T23:35:23Repositório 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 of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae). |
title |
Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae). |
spellingShingle |
Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae). BOLDRINI, K. R. Braquiária Brachiaria Humidicola Gramínea Forrageira Melhoramento Genético Vegetal Pastagem |
title_short |
Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae). |
title_full |
Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae). |
title_fullStr |
Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae). |
title_full_unstemmed |
Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae). |
title_sort |
Meiotic behavior of a nonaploid accession endorses x = 6 for Brachiaria humidicola (Poaceae). |
author |
BOLDRINI, K. R. |
author_facet |
BOLDRINI, K. R. PAGLIARINI, M. S. VALLE, C. B. do |
author_role |
author |
author2 |
PAGLIARINI, M. S. VALLE, C. B. do |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
K. R. BOLDRINI, UEM; M. S. PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC. |
dc.contributor.author.fl_str_mv |
BOLDRINI, K. R. PAGLIARINI, M. S. VALLE, C. B. do |
dc.subject.por.fl_str_mv |
Braquiária Brachiaria Humidicola Gramínea Forrageira Melhoramento Genético Vegetal Pastagem |
topic |
Braquiária Brachiaria Humidicola Gramínea Forrageira Melhoramento Genético Vegetal Pastagem |
description |
Brachiaria humidicola (Poaceae), originally from Africa, is an economically important pasture plant in tropical South America. An accession of B. humidicola (H038) collected from the wild African savanna (Mbeya, Tanzania) showed irregular microsporogenesis. This meiotic behavior was consistent with an allopolyploid origin. Multivalent chromosome association at diakinesis gave tri- to octavalents, associated with two nucleoli in some cells. Six non-congregated univalents in metaphase I and anaphase I, along with previous lines of evidence for x = 6 in B. humidicola, confirm H038 as a nonaploid accession, 2n = 9x = 54. Asynchrony in the genome during microsporogenesis also corroborated this assumption. Its putative origin could be a cross between two related species with different rhythms in meiosis. The meiotic behavior of this accession reinforces the hypothesis of the existence of a new basic chromosome number (x = 6) for Brachiaria. The use of this accession in the breeding of this important forage grass for the tropics is discussed. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009 2010-03-19 2018-01-29T23:35:17Z 2018-01-29T23:35:17Z 2018-01-29T23:35:17Z |
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. 8, n.4, p. 1444-1450, 2009. http://www.alice.cnptia.embrapa.br/alice/handle/doc/661808 10.4238/vol8-4gmr679 |
identifier_str_mv |
Genetics and Molecular Research, v. 8, n.4, p. 1444-1450, 2009. 10.4238/vol8-4gmr679 |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/661808 |
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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1794503448827265024 |