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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
07/11/2000 |
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Data da última atualização: |
08/06/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SANTOS, M. X. dos; POLLAK, L. M.; PACHECO, C. A. P.; GUIMARAES, P. E. O.; PETERNELLI, L. A.; PARENTONI, S. N.; NASS, L. L. |
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Afiliação: |
CLESO ANTONIO PATTO PACHECO, CNPMS; PAULO EVARISTO DE O GUIMARAES, CNPMS; SIDNEY NETTO PARENTONI, CNPMS. |
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Título: |
Incorporating different proportions of exotic maize germplasm into two adapted populations. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Genetics and Molecular Biology, Ribeirão Preto, v. 23, n. 2, p. 445-451, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Maize breeders frequently wish to use exotic germplasm in their breeding programs without losing specific characteristics of their adapted material. The objective of this study was to determine the optimal proportions of exotic germplasm to incorporate into adapted populations (F2 = 50% exotic, BC1 = 25% exotic, BC2 = 12.5% exotic and BC3 = 6.25% exotic) to form the initial foundation population and to determine the heterosis between adapted x exotics. We used six exotic populations of different origins and two adapted populations representing a Brazilian heterotic pattern. In 1993-94 and 1994-95, the parents, F1, F2, BC1, BC2, BC3 and four checks were evaluated in six environments in central Brazil using an 8 x 9 simple rectangular lattice design. Higher mean values for yield were obtained as the proportions of exotic germplasm decreased. Some backcrosses produced more than the adapted populations BR 105 (7.59 ton/ha) and BR 106 (8.43 ton/ha). The best results were obtained when incorporating 6.25 or 12.5% of exotic genes. This trend was true for root lodging, stalk lodging and ear diseases but not for plant and ear height. The midparent heterosis for yield varied from - 16.1 to 40.3%. Midparent heterosis with positive and negative values were also found for the other traits. The results indicate the potential of exotic germplasm for developing good hybrids. After choosing the best exotic source, some recurrent selection might be appropriate in order to adapt and improve the exotic populations. MenosMaize breeders frequently wish to use exotic germplasm in their breeding programs without losing specific characteristics of their adapted material. The objective of this study was to determine the optimal proportions of exotic germplasm to incorporate into adapted populations (F2 = 50% exotic, BC1 = 25% exotic, BC2 = 12.5% exotic and BC3 = 6.25% exotic) to form the initial foundation population and to determine the heterosis between adapted x exotics. We used six exotic populations of different origins and two adapted populations representing a Brazilian heterotic pattern. In 1993-94 and 1994-95, the parents, F1, F2, BC1, BC2, BC3 and four checks were evaluated in six environments in central Brazil using an 8 x 9 simple rectangular lattice design. Higher mean values for yield were obtained as the proportions of exotic germplasm decreased. Some backcrosses produced more than the adapted populations BR 105 (7.59 ton/ha) and BR 106 (8.43 ton/ha). The best results were obtained when incorporating 6.25 or 12.5% of exotic genes. This trend was true for root lodging, stalk lodging and ear diseases but not for plant and ear height. The midparent heterosis for yield varied from - 16.1 to 40.3%. Midparent heterosis with positive and negative values were also found for the other traits. The results indicate the potential of exotic germplasm for developing good hybrids. After choosing the best exotic source, some recurrent selection might be appropriate in order to adapt and improve th... Mostrar Tudo |
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Palavras-Chave: |
Exotic; Exotico; Maize. |
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Thesagro: |
Germoplasma; Melhoramento; Milho; Zea Mays. |
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Thesaurus Nal: |
breeding; germplasm. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/32712/1/Incorporating-different.pdf
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Marc: |
LEADER 02360naa a2200301 a 4500
001 1484395
005 2018-06-08
008 2000 bl uuuu u00u1 u #d
100 1 $aSANTOS, M. X. dos
245 $aIncorporating different proportions of exotic maize germplasm into two adapted populations.$h[electronic resource]
260 $c2000
520 $aMaize breeders frequently wish to use exotic germplasm in their breeding programs without losing specific characteristics of their adapted material. The objective of this study was to determine the optimal proportions of exotic germplasm to incorporate into adapted populations (F2 = 50% exotic, BC1 = 25% exotic, BC2 = 12.5% exotic and BC3 = 6.25% exotic) to form the initial foundation population and to determine the heterosis between adapted x exotics. We used six exotic populations of different origins and two adapted populations representing a Brazilian heterotic pattern. In 1993-94 and 1994-95, the parents, F1, F2, BC1, BC2, BC3 and four checks were evaluated in six environments in central Brazil using an 8 x 9 simple rectangular lattice design. Higher mean values for yield were obtained as the proportions of exotic germplasm decreased. Some backcrosses produced more than the adapted populations BR 105 (7.59 ton/ha) and BR 106 (8.43 ton/ha). The best results were obtained when incorporating 6.25 or 12.5% of exotic genes. This trend was true for root lodging, stalk lodging and ear diseases but not for plant and ear height. The midparent heterosis for yield varied from - 16.1 to 40.3%. Midparent heterosis with positive and negative values were also found for the other traits. The results indicate the potential of exotic germplasm for developing good hybrids. After choosing the best exotic source, some recurrent selection might be appropriate in order to adapt and improve the exotic populations.
650 $abreeding
650 $agermplasm
650 $aGermoplasma
650 $aMelhoramento
650 $aMilho
650 $aZea Mays
653 $aExotic
653 $aExotico
653 $aMaize
700 1 $aPOLLAK, L. M.
700 1 $aPACHECO, C. A. P.
700 1 $aGUIMARAES, P. E. O.
700 1 $aPETERNELLI, L. A.
700 1 $aPARENTONI, S. N.
700 1 $aNASS, L. L.
773 $tGenetics and Molecular Biology, Ribeirão Preto$gv. 23, n. 2, p. 445-451, 2000.
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Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Recursos Genéticos e Biotecnologia. Para informações adicionais entre em contato com cenargen.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
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Data corrente: |
15/10/2009 |
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Data da última atualização: |
15/10/2009 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
ARAGAO, F. J. L. |
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Afiliação: |
FRANCISCO JOSE LIMA ARAGAO, CENARGEN. |
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Título: |
Engenharia metabólica em plantas para o melhoramento nutricional e otimização da produção de biocombustíveis. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE FISIOLOGIA VEGETAL, 12., 2009, Fortaleza. Desafios para a produção de alimentos e bioenergia: livro de resumos. Fortaleza: SBFV: UFC: Embrapa Agroindústria Tropical, 2009. p. 376. |
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Idioma: |
Português |
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Notas: |
Resumos das palestras. |
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Palavras-Chave: |
Melhoramento nutricional; Transformação genética. |
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Thesagro: |
Engenharia genética. |
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Thesaurus NAL: |
biodiesel. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00705nam a2200157 a 4500
001 1513958
005 2009-10-15
008 2009 bl uuuu u01u1 u #d
100 1 $aARAGAO, F. J. L.
245 $aEngenharia metabólica em plantas para o melhoramento nutricional e otimização da produção de biocombustíveis.
260 $aIn: CONGRESSO BRASILEIRO DE FISIOLOGIA VEGETAL, 12., 2009, Fortaleza. Desafios para a produção de alimentos e bioenergia: livro de resumos. Fortaleza: SBFV: UFC: Embrapa Agroindústria Tropical, 2009. p. 376.$c2009
500 $aResumos das palestras.
650 $abiodiesel
650 $aEngenharia genética
653 $aMelhoramento nutricional
653 $aTransformação genética
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