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| 175. |  | ZILLI, J. E.; CAMPO, R. J.; RIBEIRO, K. G.; GIANLUPPI, V.; SMIDERLE, O. J.; HUNGRIA, M. Eficiência das estirpes de Bradyrhizobium recomendadas no Brasil para a fixação biológica de nitrogênio (FBN) na cultura da soja, cultivada no Cerrado de Roraima. In: CONGRESSO BRASILEIRO DE SOJA, 4., 2006, Londrina. Resumos... Londrina: Embrapa Soja, 2006. p. 182. Organizado por Odilon Ferreira Saraiva, Simone Ery Grosskopf.| Biblioteca(s): Embrapa Soja. |
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| 176. | | ZILLI, J. E.; CAMPO, R. J.; RIBEIRO, K. G.; GIANLUPPI, V.; SMIDERLE, O. J.; HUNGRIA, M. Eficiência da fixação biológica de nitrogênio na soja em área primeiro ano de cultivo, no cerrado de Roraima. In: CONGRESSO BRASILEIRO DE SOJA, 4., 2006, Londrina. Resumos... Londrina: Embrapa Soja, 2006. p. 181-182. Organizado por Odilon Ferreira Saraiva, Simone Ery Grosskopf.| Biblioteca(s): Embrapa Soja. |
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| 177. | | SFREDO, G. J.; CAMPO, R. J.; PALHANO, J. B.; BORKERT, C. M.; CORDEIRO, D. S. Efeitos de niveis e fontes de fosforo sobre a disponibilidade de fosforo e sobre o rendimento da soja. In: SEMINARIO NACIONAL DE PESQUISA DE SOJA, 2., 1981, Brasilia. Anais... Londrina: EMBRAPA-CNPSo, 1982. v.2 p.658-669. (EMBRAPA-CNPSo. Documentos, 1).| Biblioteca(s): Embrapa Soja. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
21/10/2005 |
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Data da última atualização: |
21/10/2005 |
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Autoria: |
HUNGRIA, M.; CAMPO, R. J.; GALLI-TERESAWA, L. V.; FERREIRA, M. C.; CHUEIRE, L. M. O. |
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Título: |
Genetic structure of soybean Bradyrhizobia populations in Brazil. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
In: INTERNATIONAL SYMPOSIUM ON MICROBIAL ECOLOGY, 10., 2004, Cancun. Microbial planet: sub-surface to space. Cancun: Internacional Society for Microbial, 2004. p. 1059. |
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Idioma: |
Inglês |
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Conteúdo: |
Soybean was introduced in Brazil in 1882 but only in the 1940s the expansion of commercial crops started. Brazilian soils are originally void of soybean bradyrhizobia therefore inoculants were brought from foreigner countries during the crop expansion period. Selection of adapted strains soon started and still continues such that today 14 million doses of inoculants containing the strains recommended by the researchers were sold in the last crop season. Analyses of soybean bradyrhizobia populations in 18 sites covering the whole Brazilian territory and including uncropped and cropped areas were performed by our group. The populations were trapped by both modern cultivars and unimproved promiscuous genotypes. The results indicated dispersion of strains from areas cropped with soybean to uncropped areas, genetic modifications due to the adaptation to the stressful conditions typical from tropical regions, such as high temperatures and low soil moisture. There are also evidences of lateral transfer of nif genes from inoculant strains to indigenous rhizobia. In most soils, after a five-year period of cropping an enormous diversity was observed among the isolates in relation to morphological, physiological, serological, genetic and symbiotic properties. The rhizobial diversity increases considerably when the period cropped with the host plant increases. The high diversity may play an important role as a biological buffer, avoiding the dominance of a particular strain, but may also limit the introduction of selected strains with higher capacity of N2 fixation. MenosSoybean was introduced in Brazil in 1882 but only in the 1940s the expansion of commercial crops started. Brazilian soils are originally void of soybean bradyrhizobia therefore inoculants were brought from foreigner countries during the crop expansion period. Selection of adapted strains soon started and still continues such that today 14 million doses of inoculants containing the strains recommended by the researchers were sold in the last crop season. Analyses of soybean bradyrhizobia populations in 18 sites covering the whole Brazilian territory and including uncropped and cropped areas were performed by our group. The populations were trapped by both modern cultivars and unimproved promiscuous genotypes. The results indicated dispersion of strains from areas cropped with soybean to uncropped areas, genetic modifications due to the adaptation to the stressful conditions typical from tropical regions, such as high temperatures and low soil moisture. There are also evidences of lateral transfer of nif genes from inoculant strains to indigenous rhizobia. In most soils, after a five-year period of cropping an enormous diversity was observed among the isolates in relation to morphological, physiological, serological, genetic and symbiotic properties. The rhizobial diversity increases considerably when the period cropped with the host plant increases. The high diversity may play an important role as a biological buffer, avoiding the dominance of a particular strain, but may als... Mostrar Tudo |
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Thesagro: |
Bacteriologia do Solo; Rhizobium; Semente; Soja. |
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Categoria do assunto: |
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Marc: |
LEADER 02277naa a2200217 a 4500
001 1468466
005 2005-10-21
008 2004 bl --- 0-- u #d
100 1 $aHUNGRIA, M.
245 $aGenetic structure of soybean Bradyrhizobia populations in Brazil.
260 $c2004
520 $aSoybean was introduced in Brazil in 1882 but only in the 1940s the expansion of commercial crops started. Brazilian soils are originally void of soybean bradyrhizobia therefore inoculants were brought from foreigner countries during the crop expansion period. Selection of adapted strains soon started and still continues such that today 14 million doses of inoculants containing the strains recommended by the researchers were sold in the last crop season. Analyses of soybean bradyrhizobia populations in 18 sites covering the whole Brazilian territory and including uncropped and cropped areas were performed by our group. The populations were trapped by both modern cultivars and unimproved promiscuous genotypes. The results indicated dispersion of strains from areas cropped with soybean to uncropped areas, genetic modifications due to the adaptation to the stressful conditions typical from tropical regions, such as high temperatures and low soil moisture. There are also evidences of lateral transfer of nif genes from inoculant strains to indigenous rhizobia. In most soils, after a five-year period of cropping an enormous diversity was observed among the isolates in relation to morphological, physiological, serological, genetic and symbiotic properties. The rhizobial diversity increases considerably when the period cropped with the host plant increases. The high diversity may play an important role as a biological buffer, avoiding the dominance of a particular strain, but may also limit the introduction of selected strains with higher capacity of N2 fixation.
650 $aBacteriologia do Solo
650 $aRhizobium
650 $aSemente
650 $aSoja
700 1 $aCAMPO, R. J.
700 1 $aGALLI-TERESAWA, L. V.
700 1 $aFERREIRA, M. C.
700 1 $aCHUEIRE, L. M. O.
773 $tIn: INTERNATIONAL SYMPOSIUM ON MICROBIAL ECOLOGY, 10., 2004, Cancun. Microbial planet: sub-surface to space. Cancun: Internacional Society for Microbial, 2004. p. 1059.
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