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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
22/06/2010 |
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Data da última atualização: |
26/05/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FELISMINO, M. F.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
MARIANA FERRARI FELISMINO, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Meiotic behavior of interspecific hybrids between artificially tetraploidized sexual Brachiaria ruziziensis and tetraploid apomictic B. brizantha (Poaceae). |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Scientia Agricola, v. 67, n. 2, p. 191-197, Mar./Abr. 2010. |
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Idioma: |
Português |
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Conteúdo: |
ABSTRACT -The meiotic behavior of four interspecific promising hybrids was evaluated by conventional cytological methods. The female genitors were two artificially tetraploidized sexual accessions of B. ruziziensis (R41 and R44, 2n = 4 ? = 36), which were crossed to an agronomically superior natural tetraploid apomictic genotype of B. brizantha (B140 - BRA003395). Three of them (HBGC313, HBGC 315, and HBGC324) were sexual and one (HBGC325) apomictic. Analyses of some cells in diakinesis revealed multivalent chromosome configurations, suggesting that genetic recombination and introgression of some genes could be present. The four hybrids had different types of meiotic abnormalities at various frequencies. Abnormalities related to irregular chromosome segregation due to polyploidy were common among these hybrids, and characterized by precocious chromosome migration to the poles, laggard chromosomes, both generating micronuclei in telophases and tetrads and, as a consequence, unbalanced gametes. One abnormality genotype-specific, related to spindle orientation (a putative divergent spindle mutation), was recorded for the first time in two of the hybrids, HBGC313 and HBGC325. The sexual hybrid HBGC324 had the lower rate of abnormalities, and it could be used as a female genitor in future crosses in the breeding program. The abnormalities present in these hybrids may impact fertility and affect seed production. Based on the results, HBGC324 is the single hybrid recommended to the breeding program. Hybrids must produce a good amount of viable seeds, besides good overall dry matter production and nutritive value, in order to be widely utilized and adopted in production systems. Due to pseudogamy, the desirable superior apomictic hybrids need viable pollen grains to fertilize the secondary nucleus of the embryo sac and thus ensure normal and vigorous endosperm development and plenty of seed set. MenosABSTRACT -The meiotic behavior of four interspecific promising hybrids was evaluated by conventional cytological methods. The female genitors were two artificially tetraploidized sexual accessions of B. ruziziensis (R41 and R44, 2n = 4 ? = 36), which were crossed to an agronomically superior natural tetraploid apomictic genotype of B. brizantha (B140 - BRA003395). Three of them (HBGC313, HBGC 315, and HBGC324) were sexual and one (HBGC325) apomictic. Analyses of some cells in diakinesis revealed multivalent chromosome configurations, suggesting that genetic recombination and introgression of some genes could be present. The four hybrids had different types of meiotic abnormalities at various frequencies. Abnormalities related to irregular chromosome segregation due to polyploidy were common among these hybrids, and characterized by precocious chromosome migration to the poles, laggard chromosomes, both generating micronuclei in telophases and tetrads and, as a consequence, unbalanced gametes. One abnormality genotype-specific, related to spindle orientation (a putative divergent spindle mutation), was recorded for the first time in two of the hybrids, HBGC313 and HBGC325. The sexual hybrid HBGC324 had the lower rate of abnormalities, and it could be used as a female genitor in future crosses in the breeding program. The abnormalities present in these hybrids may impact fertility and affect seed production. Based on the results, HBGC324 is the single hybrid recommended to the... Mostrar Tudo |
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Thesagro: |
Brachiaria Brizantha; Brachiaria Ruziziensis; Citogenética Vegetal; Melhoramento Genético Vegetal; Pastagem; Planta Forrageira. |
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Thesaurus Nal: |
Cytogenetics; Forage grasses; Meiosis; Plant breeding. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/855809/1/Meiotic-behavior-interspecific-2010.pdf
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Marc: |
LEADER 02763naa a2200265 a 4500
001 1855809
005 2023-05-26
008 2010 bl uuuu u00u1 u #d
100 1 $aFELISMINO, M. F.
245 $aMeiotic behavior of interspecific hybrids between artificially tetraploidized sexual Brachiaria ruziziensis and tetraploid apomictic B. brizantha (Poaceae).
260 $c2010
520 $aABSTRACT -The meiotic behavior of four interspecific promising hybrids was evaluated by conventional cytological methods. The female genitors were two artificially tetraploidized sexual accessions of B. ruziziensis (R41 and R44, 2n = 4 ? = 36), which were crossed to an agronomically superior natural tetraploid apomictic genotype of B. brizantha (B140 - BRA003395). Three of them (HBGC313, HBGC 315, and HBGC324) were sexual and one (HBGC325) apomictic. Analyses of some cells in diakinesis revealed multivalent chromosome configurations, suggesting that genetic recombination and introgression of some genes could be present. The four hybrids had different types of meiotic abnormalities at various frequencies. Abnormalities related to irregular chromosome segregation due to polyploidy were common among these hybrids, and characterized by precocious chromosome migration to the poles, laggard chromosomes, both generating micronuclei in telophases and tetrads and, as a consequence, unbalanced gametes. One abnormality genotype-specific, related to spindle orientation (a putative divergent spindle mutation), was recorded for the first time in two of the hybrids, HBGC313 and HBGC325. The sexual hybrid HBGC324 had the lower rate of abnormalities, and it could be used as a female genitor in future crosses in the breeding program. The abnormalities present in these hybrids may impact fertility and affect seed production. Based on the results, HBGC324 is the single hybrid recommended to the breeding program. Hybrids must produce a good amount of viable seeds, besides good overall dry matter production and nutritive value, in order to be widely utilized and adopted in production systems. Due to pseudogamy, the desirable superior apomictic hybrids need viable pollen grains to fertilize the secondary nucleus of the embryo sac and thus ensure normal and vigorous endosperm development and plenty of seed set.
650 $aCytogenetics
650 $aForage grasses
650 $aMeiosis
650 $aPlant breeding
650 $aBrachiaria Brizantha
650 $aBrachiaria Ruziziensis
650 $aCitogenética Vegetal
650 $aMelhoramento Genético Vegetal
650 $aPastagem
650 $aPlanta Forrageira
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tScientia Agricola$gv. 67, n. 2, p. 191-197, Mar./Abr. 2010.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
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Data corrente: |
14/12/2005 |
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Data da última atualização: |
27/12/2005 |
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Autoria: |
NASS, L. L.; JOSÉ JÚNIOR, G.; SANTOS, R. F.; ANDRADE, R. V.; TEIXEIRA, F. F. |
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Título: |
Recursos genéticos de milho (Zea mays L.) no Brasil. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
In: ENCONTRO DA SOCIEDADE BRASILEIRA DE MELHORAMENTO DE PLANTAS REGIONAL DF, 1., 2005, Brasília, DF. [Anais...]. Brasília: Embrapa Recursos Genéticos e Biotecnologia, 2005. |
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Páginas: |
p. 151. |
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Série: |
(Embrapa Recursos Genéticos e Biotecnologia. Documentos, 144). |
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Idioma: |
Português |
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Thesagro: |
Melhoramento Vegetal. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CENARGEN/26225/1/doc144.pdf
https://www.cenargen.embrapa.br/publica/trabalhos/doc144.pdf
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Marc: |
LEADER 00679nam a2200181 a 4500
001 1186675
005 2005-12-27
008 2005 bl uuuu u00u1 u #d
100 1 $aNASS, L. L.
245 $aRecursos genéticos de milho (Zea mays L.) no Brasil.
260 $aIn: ENCONTRO DA SOCIEDADE BRASILEIRA DE MELHORAMENTO DE PLANTAS REGIONAL DF, 1., 2005, Brasília, DF. [Anais...]. Brasília: Embrapa Recursos Genéticos e Biotecnologia$c2005
300 $ap. 151.
490 $a(Embrapa Recursos Genéticos e Biotecnologia. Documentos, 144).
650 $aMelhoramento Vegetal
700 1 $aJOSÉ JÚNIOR, G.
700 1 $aSANTOS, R. F.
700 1 $aANDRADE, R. V.
700 1 $aTEIXEIRA, F. F.
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Embrapa Recursos Genéticos e Biotecnologia (CENARGEN) |
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