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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão; Embrapa Unidades Centrais. |
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Data corrente: |
08/01/1997 |
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Data da última atualização: |
07/10/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GUIMARÃES, E. P.; BORRERO, J.; OSPINA-REY, Y. |
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Afiliação: |
ELCIO PERPETUO GUIMARAES, CNPAF; JAIME BORRERO, CIAT; YOLIMA OSPINA-REY, CIAT. |
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Título: |
Genetic diversity of upland rice germplasm distributed in Latin America. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, v. 31, n. 3, p. 187-194, mar. 1996. |
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Idioma: |
Inglês |
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Conteúdo: |
Narrow genetic base has been a concern in irrigated rice. Upland rice varieties in Latin America show a similar trend. The parentage of 2,061 upland crosses and 271 advanced lines that CIAT (Centro Internacional de Agricultura Tropical) distributed to partners was traced back to the immediate parents; the yearly percentage participation was estimated. The main objectives were to assess the genetic variability used and distributed by CIAT, to identify reasons why genetic diversity is eliminated, and to propose alternatives for broadening the genetic base. African germplasm contributed to 46.0% of the parents used in crosses and 34.6% in the advanced lines. A maximum of 12 and a minimum of 4 lines were necessary to make up 50% of the participation frequency in crosses every year; globally it required 16 lines. Intense selection pressure for agronomically important traits, such as plant type and blast resistance, eliminated between 17.6 and 69.0% of the early segregating lines every year. Sharing germplasm at early stages of development and population improvement through recurrent selection are alternatives that offer broad-base germplasm to Programs in Latin America. |
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Palavras-Chave: |
America Latina; Ampliacao da base genetica; Base; Broadening genetic base; Diversidade. |
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Thesagro: |
Arroz; Genética; Oryza Sativa. |
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Thesaurus Nal: |
rice. |
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Categoria do assunto: |
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G Melhoramento Genético |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/19273/1/pab96_05_mar.pdf
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Marc: |
LEADER 01873naa a2200253 a 4500
001 1205823
005 2021-10-07
008 1996 bl uuuu u00u1 u #d
100 1 $aGUIMARÃES, E. P.
245 $aGenetic diversity of upland rice germplasm distributed in Latin America.
260 $c1996
520 $aNarrow genetic base has been a concern in irrigated rice. Upland rice varieties in Latin America show a similar trend. The parentage of 2,061 upland crosses and 271 advanced lines that CIAT (Centro Internacional de Agricultura Tropical) distributed to partners was traced back to the immediate parents; the yearly percentage participation was estimated. The main objectives were to assess the genetic variability used and distributed by CIAT, to identify reasons why genetic diversity is eliminated, and to propose alternatives for broadening the genetic base. African germplasm contributed to 46.0% of the parents used in crosses and 34.6% in the advanced lines. A maximum of 12 and a minimum of 4 lines were necessary to make up 50% of the participation frequency in crosses every year; globally it required 16 lines. Intense selection pressure for agronomically important traits, such as plant type and blast resistance, eliminated between 17.6 and 69.0% of the early segregating lines every year. Sharing germplasm at early stages of development and population improvement through recurrent selection are alternatives that offer broad-base germplasm to Programs in Latin America.
650 $arice
650 $aArroz
650 $aGenética
650 $aOryza Sativa
653 $aAmerica Latina
653 $aAmpliacao da base genetica
653 $aBase
653 $aBroadening genetic base
653 $aDiversidade
700 1 $aBORRERO, J.
700 1 $aOSPINA-REY, Y.
773 $tPesquisa Agropecuária Brasileira$gv. 31, n. 3, p. 187-194, mar. 1996.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
28/04/1995 |
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Data da última atualização: |
28/04/1995 |
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Autoria: |
SOUSA, D. M. G. de; RITCHEY, K. D. |
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Título: |
Correcao de acidez sub-superficial: uso de gesso no solo de cerrado. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
In: SIMPOSIO AVANCADO DE QUIMICA E FERTILIDADE DO SOLO, 1986, Piracicaba, SP. Anais. Campinas: Fundacao Cargill, 1986. |
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Páginas: |
p.91-113. |
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Idioma: |
Português |
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Thesagro: |
Acidez do Solo; Cerrado; Gesso. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00532naa a2200169 a 4500
001 1550177
005 1995-04-28
008 1986 bl uuuu u00u1 u #d
100 1 $aSOUSA, D. M. G. de
245 $aCorrecao de acidez sub-superficial$buso de gesso no solo de cerrado.
260 $c1986
300 $ap.91-113.
650 $aAcidez do Solo
650 $aCerrado
650 $aGesso
700 1 $aRITCHEY, K. D.
773 $tIn: SIMPOSIO AVANCADO DE QUIMICA E FERTILIDADE DO SOLO, 1986, Piracicaba, SP. Anais. Campinas: Fundacao Cargill, 1986.
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro |
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