Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf

The meiotic behavior of three tetraploid plants (2n=4x=36) originated from somatic chromosome duplication of sexually reproducing diploid plants of Brachiaria decumbens was evaluated. All the analyzed plants presented abnormalities related to polyploidy, such as irregular chromosome segregation, lea...

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Detalhes bibliográficos
Autores: Simioni, Carine, Valle, Cacilda Borges do
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2011
País:Brasil
Recursos:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositório:Repositório Institucional da UFRGS
Idioma:inglês
OAI Identifier:oai:www.lume.ufrgs.br:10183/108563
Acesso em linha:http://hdl.handle.net/10183/108563
Access Level:Acceso aberto
Palavra-chave:Melhoramento vegetal
Planta forrageira
Brachiaria decumbens
Brachiaria
Chromosome duplication
Intraspecific crosses
Meiotic behavior
Plant breeding
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spelling 2014-12-23T02:13:37Z20111518-7853http://hdl.handle.net/10183/108563000778977The meiotic behavior of three tetraploid plants (2n=4x=36) originated from somatic chromosome duplication of sexually reproducing diploid plants of Brachiaria decumbens was evaluated. All the analyzed plants presented abnormalities related to polyploidy, such as irregular chromosome segregation, leading to precocious chromosome migration to the poles and micronuclei during both meiotic divisions. However, the abnormalities observed did not compromise the meiotic products which were characterized by regular tetrads and satisfactory pollen fertility varying from 61.36 to 64.86%. Chromosomes paired mostly as bivalents in diakinesis but univalents to tetravalents were also observed. These studies contributed to the choice of compatible fertile sexual genitors to be crossed to natural tetraploid apomicts in the B. decumbens by identifying abnormalities and verifying pollen fertility. Intraespecific crosses should reduce sterility in the hybrids produced in the breeding program of Brachiaria, a problem observed with the interspecific hybrids produced so far.application/pdfengCrop Breeding and Applied Biotechnology. Londrina. Vol. 11, n.1 (mar. 2011), p. 43-49Melhoramento vegetalPlanta forrageiraBrachiaria decumbensBrachiariaChromosome duplicationIntraspecific crossesMeiotic behaviorPlant breedingMeiotic analysis in induced tetraploids of Brachiaria decumbens Stapfinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSSimioni, CarineValle, Cacilda Borges doORIGINAL000778977.pdf000778977.pdfTexto completo (inglês)application/pdf808518http://www.lume.ufrgs.br/bitstream/10183/108563/1/000778977.pdf779b7ff2efe0266865acc17ef8cf249eMD51TEXT000778977.pdf.txt000778977.pdf.txtExtracted Texttext/plain23412http://www.lume.ufrgs.br/bitstream/10183/108563/2/000778977.pdf.txt8d9b7d60f472e750c0bd06c703d8162cMD52THUMBNAIL000778977.pdf.jpg000778977.pdf.jpgGenerated Thumbnailimage/jpeg1494http://www.lume.ufrgs.br/bitstream/10183/108563/3/000778977.pdf.jpg3052a399db545ffdcc971bdea2a6db92MD5310183/1085632021-09-19 04:34:59.466174oai:www.lume.ufrgs.br:10183/108563Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2021-09-19T07:34:59Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf
title Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf
spellingShingle Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf
Simioni, Carine
Melhoramento vegetal
Planta forrageira
Brachiaria decumbens
Brachiaria
Chromosome duplication
Intraspecific crosses
Meiotic behavior
Plant breeding
title_short Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf
title_full Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf
title_fullStr Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf
title_full_unstemmed Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf
title_sort Meiotic analysis in induced tetraploids of Brachiaria decumbens Stapf
dc.creator.none.fl_str_mv Simioni, Carine
Valle, Cacilda Borges do
author Simioni, Carine
author_facet Simioni, Carine
Valle, Cacilda Borges do
author_role author
author2 Valle, Cacilda Borges do
author2_role author
dc.subject.por.fl_str_mv Melhoramento vegetal
Planta forrageira
Brachiaria decumbens
topic Melhoramento vegetal
Planta forrageira
Brachiaria decumbens
Brachiaria
Chromosome duplication
Intraspecific crosses
Meiotic behavior
Plant breeding
dc.subject.eng.fl_str_mv Brachiaria
Chromosome duplication
Intraspecific crosses
Meiotic behavior
Plant breeding
description The meiotic behavior of three tetraploid plants (2n=4x=36) originated from somatic chromosome duplication of sexually reproducing diploid plants of Brachiaria decumbens was evaluated. All the analyzed plants presented abnormalities related to polyploidy, such as irregular chromosome segregation, leading to precocious chromosome migration to the poles and micronuclei during both meiotic divisions. However, the abnormalities observed did not compromise the meiotic products which were characterized by regular tetrads and satisfactory pollen fertility varying from 61.36 to 64.86%. Chromosomes paired mostly as bivalents in diakinesis but univalents to tetravalents were also observed. These studies contributed to the choice of compatible fertile sexual genitors to be crossed to natural tetraploid apomicts in the B. decumbens by identifying abnormalities and verifying pollen fertility. Intraespecific crosses should reduce sterility in the hybrids produced in the breeding program of Brachiaria, a problem observed with the interspecific hybrids produced so far.
publishDate 2011
dc.date.issued.fl_str_mv 2011
dc.date.accessioned.fl_str_mv 2014-12-23T02:13:37Z
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/108563
dc.identifier.issn.pt_BR.fl_str_mv 1518-7853
dc.identifier.nrb.pt_BR.fl_str_mv 000778977
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url http://hdl.handle.net/10183/108563
dc.language.iso.fl_str_mv eng
language eng
dc.relation.ispartof.pt_BR.fl_str_mv Crop Breeding and Applied Biotechnology. Londrina. Vol. 11, n.1 (mar. 2011), p. 43-49
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