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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
23/10/2003 |
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Data da última atualização: |
31/05/2007 |
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Autoria: |
PINHEIRO, R. de O.; BODDEY, L. H.; JAMES, A. K.; SPRENT, J. I.; BODDEY, R. M. |
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Título: |
Adsorption and anchoring of Azospirillum strains to roots of wheat seedlings. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Pant and Soil, Netherlands, v. 246, p. 151-166, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
Recent microscopic evidence acquired using strain-specific monoclonal antibodies and specific gene probes confirms earlier claims that some strains of Azospirillum lipoferum and A. brasilense, but not others, are capable of infecting the interior of wheat roots. The present study was performed to determine whether this strain specificity in the infection of the interior of wheat roots was apparent in the first 24 h of adsorption ('anchoring') of Azospiri1lum cells to the root surface. Strains of A. brasilense, originally isolated from surface-sterilized wheat roots (Sp 245, Sp 107) or with a proven ability to infect the interior of wheat roots (Sp 245), showed no greater ability to anchor to the roots than other Azospirillum strains isolated from the wheat rhizosphere (Sp 246) or from the rhizosphere or rhizosphere soil of other gramineae (Sp 7, Cd, S 82). The SEM images showed that at the root tip the Azospirillum cells were principally located in cracks between epidermal cells. In the root hair zone the bacteria were more numerous but again principally located in the depressions between epidermal cells. In all zones of the roots mucilage was present, and near the tip this appeared to have been partially digested, forming 'halos' aroun4 the bacteria and revealing fibril-like strands attached to the bacteria. Subsequent studies were conducted using à technique originally developed for investigating competition of rhizobia for adsorption sites on legume roots. In the adaptation of this technique it was found that the presence of any significant concentration of Ca++ in the incubation medium reduced bacterial adsorption, as did concentrations of (PO4)3- above 50 m M. The influence of the pH of the incubation medium on the adsorption of ten different strains of Azospirillum showed, that with one exception, strains isolated from the roots or rhizosphere of wheat showed optimum adsorption at pH 6.0, and all other strains pH 7.0. Apart from this effect of pH no differences in adsorption were detected between strains with a proven capacity to infect wheat roots and those unable to do so. However, strains varied in their capability to compete for adsorption sites, there being a tendency for strains with a proven capacity to invade the internal tissues of wheat roots to be more competitive for adsorption sites. MenosRecent microscopic evidence acquired using strain-specific monoclonal antibodies and specific gene probes confirms earlier claims that some strains of Azospirillum lipoferum and A. brasilense, but not others, are capable of infecting the interior of wheat roots. The present study was performed to determine whether this strain specificity in the infection of the interior of wheat roots was apparent in the first 24 h of adsorption ('anchoring') of Azospiri1lum cells to the root surface. Strains of A. brasilense, originally isolated from surface-sterilized wheat roots (Sp 245, Sp 107) or with a proven ability to infect the interior of wheat roots (Sp 245), showed no greater ability to anchor to the roots than other Azospirillum strains isolated from the wheat rhizosphere (Sp 246) or from the rhizosphere or rhizosphere soil of other gramineae (Sp 7, Cd, S 82). The SEM images showed that at the root tip the Azospirillum cells were principally located in cracks between epidermal cells. In the root hair zone the bacteria were more numerous but again principally located in the depressions between epidermal cells. In all zones of the roots mucilage was present, and near the tip this appeared to have been partially digested, forming 'halos' aroun4 the bacteria and revealing fibril-like strands attached to the bacteria. Subsequent studies were conducted using à technique originally developed for investigating competition of rhizobia for adsorption sites on legume roots. In the adaptati... Mostrar Tudo |
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Palavras-Chave: |
Wheats. |
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Thesagro: |
Trigo. |
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Thesaurus Nal: |
Azospirillum. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02896naa a2200205 a 4500
001 1624717
005 2007-05-31
008 2002 bl --- 0-- u #d
100 1 $aPINHEIRO, R. de O.
245 $aAdsorption and anchoring of Azospirillum strains to roots of wheat seedlings.
260 $c2002
520 $aRecent microscopic evidence acquired using strain-specific monoclonal antibodies and specific gene probes confirms earlier claims that some strains of Azospirillum lipoferum and A. brasilense, but not others, are capable of infecting the interior of wheat roots. The present study was performed to determine whether this strain specificity in the infection of the interior of wheat roots was apparent in the first 24 h of adsorption ('anchoring') of Azospiri1lum cells to the root surface. Strains of A. brasilense, originally isolated from surface-sterilized wheat roots (Sp 245, Sp 107) or with a proven ability to infect the interior of wheat roots (Sp 245), showed no greater ability to anchor to the roots than other Azospirillum strains isolated from the wheat rhizosphere (Sp 246) or from the rhizosphere or rhizosphere soil of other gramineae (Sp 7, Cd, S 82). The SEM images showed that at the root tip the Azospirillum cells were principally located in cracks between epidermal cells. In the root hair zone the bacteria were more numerous but again principally located in the depressions between epidermal cells. In all zones of the roots mucilage was present, and near the tip this appeared to have been partially digested, forming 'halos' aroun4 the bacteria and revealing fibril-like strands attached to the bacteria. Subsequent studies were conducted using à technique originally developed for investigating competition of rhizobia for adsorption sites on legume roots. In the adaptation of this technique it was found that the presence of any significant concentration of Ca++ in the incubation medium reduced bacterial adsorption, as did concentrations of (PO4)3- above 50 m M. The influence of the pH of the incubation medium on the adsorption of ten different strains of Azospirillum showed, that with one exception, strains isolated from the roots or rhizosphere of wheat showed optimum adsorption at pH 6.0, and all other strains pH 7.0. Apart from this effect of pH no differences in adsorption were detected between strains with a proven capacity to infect wheat roots and those unable to do so. However, strains varied in their capability to compete for adsorption sites, there being a tendency for strains with a proven capacity to invade the internal tissues of wheat roots to be more competitive for adsorption sites.
650 $aAzospirillum
650 $aTrigo
653 $aWheats
700 1 $aBODDEY, L. H.
700 1 $aJAMES, A. K.
700 1 $aSPRENT, J. I.
700 1 $aBODDEY, R. M.
773 $tPant and Soil, Netherlands$gv. 246, p. 151-166, 2002.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registro Completo
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
02/08/2016 |
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Data da última atualização: |
18/01/2024 |
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Tipo da produção científica: |
Documentos |
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Autoria: |
SILVA, T. S. M. da; COELHO FILHO, M. A.; COELHO, E. F. |
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Afiliação: |
TIBERIO SANTOS MARTINS DA SILVA, CNPMF; MAURICIO ANTONIO COELHO FILHO, CNPMF; EUGENIO FERREIRA COELHO, CNPMF. |
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Título: |
Boletim meteorológico da estação convencional de Cruz das Almas, BA: variabilidade e tendências climáticas. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Cruz das Almas : Embrapa Mandioca e Fruticultura, 2016. |
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Páginas: |
72p. |
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Descrição Física: |
il. |
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Série: |
(Embrapa Mandioca e Fruticultura. Documentos, 2016). |
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Idioma: |
Português |
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Conteúdo: |
Neste documento reúnem-se análises de dados dos elementos meteorológicos coletados na Estação Meteorológica da Embrapa Mandioca e Fruticultura entre os anos de 1971 e 2010, no município de Cruz das Almas, BA. O conjunto de informações geradas é de relevante importância para o conhecimento do clima da região, da sua variabilidade e das possíveis tendências climáticas, apesar da série de dados de apenas trinta anos. Considerando que todas as atividades sofrem influência do ambiente atmosfera e que o conhecimento dos seus elementos é base para sustentabilidade, a Embrapa Mandioca e Fruticultura atende a grande demanda da comunidade pela busca constante de informações das características climáticas da microrregião e dos seus dados meteorológicos que foram disponibilizados em escala mensal no formato digital. Portanto, uma referência para comunidade do município e importante ferramenta para o planejamento das empresas agrícolas, de ensino, de pesquisa e, principalmente, para o suporte na formulação de políticas públicas |
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Palavras-Chave: |
Condição climática. |
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Thesagro: |
Clima. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/145992/1/Documentos-216-Boletim-Meteorologico.pdf
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Marc: |
LEADER 01679nam a2200181 a 4500
001 2050036
005 2024-01-18
008 2016 bl uuuu 00u1 u #d
100 1 $aSILVA, T. S. M. da
245 $aBoletim meteorológico da estação convencional de Cruz das Almas, BA$bvariabilidade e tendências climáticas.$h[electronic resource]
260 $aCruz das Almas : Embrapa Mandioca e Fruticultura$c2016
300 $a72p.$cil.
490 $a(Embrapa Mandioca e Fruticultura. Documentos, 2016).
520 $aNeste documento reúnem-se análises de dados dos elementos meteorológicos coletados na Estação Meteorológica da Embrapa Mandioca e Fruticultura entre os anos de 1971 e 2010, no município de Cruz das Almas, BA. O conjunto de informações geradas é de relevante importância para o conhecimento do clima da região, da sua variabilidade e das possíveis tendências climáticas, apesar da série de dados de apenas trinta anos. Considerando que todas as atividades sofrem influência do ambiente atmosfera e que o conhecimento dos seus elementos é base para sustentabilidade, a Embrapa Mandioca e Fruticultura atende a grande demanda da comunidade pela busca constante de informações das características climáticas da microrregião e dos seus dados meteorológicos que foram disponibilizados em escala mensal no formato digital. Portanto, uma referência para comunidade do município e importante ferramenta para o planejamento das empresas agrícolas, de ensino, de pesquisa e, principalmente, para o suporte na formulação de políticas públicas
650 $aClima
653 $aCondição climática
700 1 $aCOELHO FILHO, M. A.
700 1 $aCOELHO, E. F.
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