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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
15/08/2006 |
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Data da última atualização: |
25/07/2017 |
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Autoria: |
KASCHUK, G.; HUNGRIA, M.; ANDRADE, D. S.; CAMPO, R. J. |
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Título: |
Genetic diversity of rhizobia associated with common bean (Phaseolus vulgaris L.) grown under no-tillage and conventional systems in Southern Brazil. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Applied Soil Ecology, v. 32, n. 2, p. 210-220, Jun. 2006. |
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Idioma: |
Inglês |
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Conteúdo: |
Brazil is the largest producer and consumer of the common bean (Phaseolus vulgaris L.), but yields are often low and may be improved by a higher N supply through symbiosis with rhizobia. One main limitation to the N2-fixation process is the susceptibility of the symbiosis to environmental stresses frequent in the tropics, such as high soil temperatures and low soil moisture contents. Among other benefits, the no-tillage (NT) system reduces those stresses resulting in higher N2 fixation rates and yields; however, the effects of NT on rhizobial diversity are poorly understood. This study evaluated the diversity of rhizobia compatible with common bean in cropping areas under the NT or the conventional tillage (CT) systems in Ponta Grossa, State of Paraná, Southern Brazil. Genetic diversity was assessed by DNA analyses using the methodologies of BOX-PCR and RFLP-PCR of the 16S rDNA region. A high level of diversity was observed among the strains and the DNA profiles from the CT system were quite different from those from the NT system. Twenty-three RFLP-PCR profiles were obtained, indicating that many tropical rhizobial species remain to be described. Strain differentiation was achieved in the BOX-PCR analysis; diversity was slightly higher under the NT when compared with the CT system. Surprisingly, the rhizobial grouping based on cluster analysis of the RFLP-PCR of the 16S rDNA region indicated a higher diversity of species under the CT. It could be that the environmental stability offered by the NT system has led to a decrease in the number of species, with the predominance of the most successful ones, although genetic diversity within each species has increased. The results obtained in this study show that we still understand poorly the relation between microbial diversity and soil sustainability and that the complexity of the ecosystems require the evaluation of several parameters to define and monitor soil quality. MenosBrazil is the largest producer and consumer of the common bean (Phaseolus vulgaris L.), but yields are often low and may be improved by a higher N supply through symbiosis with rhizobia. One main limitation to the N2-fixation process is the susceptibility of the symbiosis to environmental stresses frequent in the tropics, such as high soil temperatures and low soil moisture contents. Among other benefits, the no-tillage (NT) system reduces those stresses resulting in higher N2 fixation rates and yields; however, the effects of NT on rhizobial diversity are poorly understood. This study evaluated the diversity of rhizobia compatible with common bean in cropping areas under the NT or the conventional tillage (CT) systems in Ponta Grossa, State of Paraná, Southern Brazil. Genetic diversity was assessed by DNA analyses using the methodologies of BOX-PCR and RFLP-PCR of the 16S rDNA region. A high level of diversity was observed among the strains and the DNA profiles from the CT system were quite different from those from the NT system. Twenty-three RFLP-PCR profiles were obtained, indicating that many tropical rhizobial species remain to be described. Strain differentiation was achieved in the BOX-PCR analysis; diversity was slightly higher under the NT when compared with the CT system. Surprisingly, the rhizobial grouping based on cluster analysis of the RFLP-PCR of the 16S rDNA region indicated a higher diversity of species under the CT. It could be that the environmental stab... Mostrar Tudo |
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Palavras-Chave: |
Rizóbio. |
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Thesagro: |
Feijão. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02516naa a2200181 a 4500
001 1469534
005 2017-07-25
008 2006 bl --- 0-- u #d
100 1 $aKASCHUK, G.
245 $aGenetic diversity of rhizobia associated with common bean (Phaseolus vulgaris L.) grown under no-tillage and conventional systems in Southern Brazil.
260 $c2006
520 $aBrazil is the largest producer and consumer of the common bean (Phaseolus vulgaris L.), but yields are often low and may be improved by a higher N supply through symbiosis with rhizobia. One main limitation to the N2-fixation process is the susceptibility of the symbiosis to environmental stresses frequent in the tropics, such as high soil temperatures and low soil moisture contents. Among other benefits, the no-tillage (NT) system reduces those stresses resulting in higher N2 fixation rates and yields; however, the effects of NT on rhizobial diversity are poorly understood. This study evaluated the diversity of rhizobia compatible with common bean in cropping areas under the NT or the conventional tillage (CT) systems in Ponta Grossa, State of Paraná, Southern Brazil. Genetic diversity was assessed by DNA analyses using the methodologies of BOX-PCR and RFLP-PCR of the 16S rDNA region. A high level of diversity was observed among the strains and the DNA profiles from the CT system were quite different from those from the NT system. Twenty-three RFLP-PCR profiles were obtained, indicating that many tropical rhizobial species remain to be described. Strain differentiation was achieved in the BOX-PCR analysis; diversity was slightly higher under the NT when compared with the CT system. Surprisingly, the rhizobial grouping based on cluster analysis of the RFLP-PCR of the 16S rDNA region indicated a higher diversity of species under the CT. It could be that the environmental stability offered by the NT system has led to a decrease in the number of species, with the predominance of the most successful ones, although genetic diversity within each species has increased. The results obtained in this study show that we still understand poorly the relation between microbial diversity and soil sustainability and that the complexity of the ecosystems require the evaluation of several parameters to define and monitor soil quality.
650 $aFeijão
653 $aRizóbio
700 1 $aHUNGRIA, M.
700 1 $aANDRADE, D. S.
700 1 $aCAMPO, R. J.
773 $tApplied Soil Ecology$gv. 32, n. 2, p. 210-220, Jun. 2006.
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Registro original: |
Embrapa Soja (CNPSO) |
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Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
28/07/2022 |
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Data da última atualização: |
28/07/2022 |
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Autoria: |
BERNARDI, A. C. de C.; CARVALHO, M. da C. S.; FREITAS, P. L. de; OLIVEIRA JÚNIOR, J. P. de; LEANDRO, W. M.; MESQUITA, T. G. da S. |
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Afiliação: |
ALBERTO CARLOS DE CAMPOS BERNARDI, CNPS; MARIA DA CONCEICAO SANTANA CARVALHO, CNPA; PEDRO LUIZ DE FREITAS, CNPS; JUAREZ PATRÍCIO DE OLIVEIRA JÚNIOR, UFG; WILSON MOZENA LEANDRO, UFG; TIAGO GOMES DA SILVA MESQUITA, UFG. |
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Título: |
Adubação potássica e qualidade do algodão cultivado em sistema plantio direto nos cerrados. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
In: CONGRESO LATINOAMERICANO DE LA CIENCIA DEL SUELO, 16.; CONGRESO COLOMBIANO DE LA CIENCIA DEL SUELO, 12., 2004, Cartagena de Indias. Conferencias magistrales, principales del simposio y resúmenes ampliados [...] Cartagena de Indias: Sociedad Colombiana de la Ciencia del Suelo, 2004. 1 CD-ROM. |
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Idioma: |
Português |
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Conteúdo: |
Este estudo teve como objetivo avaliar a eficiência da adubação potássica com relação às doses, modos de aplicação (sulco, lanço e parcelada) e época (pré-plantio, plantio e cobertura) na qualidade da fibra da cultura do algodoeiro cultivado em sistema plantio direto em solo da região dos Cerrados. |
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Thesagro: |
Adubação; Algodão; Cerrado; Plantio Direto. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1145039/1/Adubacao-potassica-e-qualidade-do-algodao-2004.pdf
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Marc: |
LEADER 01235nam a2200217 a 4500
001 2145039
005 2022-07-28
008 2004 bl uuuu u00u1 u #d
100 1 $aBERNARDI, A. C. de C.
245 $aAdubação potássica e qualidade do algodão cultivado em sistema plantio direto nos cerrados.$h[electronic resource]
260 $aIn: CONGRESO LATINOAMERICANO DE LA CIENCIA DEL SUELO, 16.; CONGRESO COLOMBIANO DE LA CIENCIA DEL SUELO, 12., 2004, Cartagena de Indias. Conferencias magistrales, principales del simposio y resúmenes ampliados [...] Cartagena de Indias: Sociedad Colombiana de la Ciencia del Suelo, 2004. 1 CD-ROM.$c2004
520 $aEste estudo teve como objetivo avaliar a eficiência da adubação potássica com relação às doses, modos de aplicação (sulco, lanço e parcelada) e época (pré-plantio, plantio e cobertura) na qualidade da fibra da cultura do algodoeiro cultivado em sistema plantio direto em solo da região dos Cerrados.
650 $aAdubação
650 $aAlgodão
650 $aCerrado
650 $aPlantio Direto
700 1 $aCARVALHO, M. da C. S.
700 1 $aFREITAS, P. L. de
700 1 $aOLIVEIRA JÚNIOR, J. P. de
700 1 $aLEANDRO, W. M.
700 1 $aMESQUITA, T. G. da S.
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