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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Pantanal. |
Data corrente: |
17/12/2001 |
Data da última atualização: |
14/09/2010 |
Autoria: |
BENCKISER, G.; OTTOW, J. C. G.; SANTIAGO, S.; WATANABE, I. |
Título: |
Physicochemical characterization of iron-toxic soils in some Asian countries. |
Ano de publicação: |
1982 |
Fonte/Imprenta: |
Philippines: IRRI, 1982. |
Páginas: |
11 p. |
Descrição Física: |
il. |
Série: |
(IRRI. Research paper, 85). |
Idioma: |
Inglês |
Conteúdo: |
High Fe(II) levels caused by low pH and relatively high amounts of active iron and aggravated by a continuous Fe supply from upwelling or lateral seepage from adjacent hills have been blamed for excessive iron uptake. If iron toxicity is induced directly or indirectly by one or more constaints, the same stresses should be shared by soils that show bronzing and/or yellowing. To examine this hypothesis, Physicochemical analyses of soils (up to 40 cm depth) and intoxified leaves were made at different sites in the Philippines, Sri Lanka, Indonesia, China, and Liberia. Soil and plant data were correlated and sites were grouped by principal component and cluster analysis. The following conclusions were drawn: - Although iron-toxic soils were usually slightly acid, there was no correlation between pH and high Fe concentrations in the leaves. - The negative correlations between Fe in the intoxified leaves and active Fe in the soils indicate indirect relationships. - Significant correlations between iron in the rice leaves and cation exchange capacity (CEC) or exchangeable Ca and low P and exchangeable K values are characteristics shared by the soils, indicating the importance of soil nutrient status as a prerequisite for iron toxicity. The effect of a multinutritional soil stress on interactions between iron-reducing bacteria (the main iron-reducing agents in rhizosphere and soil) and rice roots (iron-excluding power and membrane permeability) are discussed and a mechanism for iron intoxification is proposed. MenosHigh Fe(II) levels caused by low pH and relatively high amounts of active iron and aggravated by a continuous Fe supply from upwelling or lateral seepage from adjacent hills have been blamed for excessive iron uptake. If iron toxicity is induced directly or indirectly by one or more constaints, the same stresses should be shared by soils that show bronzing and/or yellowing. To examine this hypothesis, Physicochemical analyses of soils (up to 40 cm depth) and intoxified leaves were made at different sites in the Philippines, Sri Lanka, Indonesia, China, and Liberia. Soil and plant data were correlated and sites were grouped by principal component and cluster analysis. The following conclusions were drawn: - Although iron-toxic soils were usually slightly acid, there was no correlation between pH and high Fe concentrations in the leaves. - The negative correlations between Fe in the intoxified leaves and active Fe in the soils indicate indirect relationships. - Significant correlations between iron in the rice leaves and cation exchange capacity (CEC) or exchangeable Ca and low P and exchangeable K values are characteristics shared by the soils, indicating the importance of soil nutrient status as a prerequisite for iron toxicity. The effect of a multinutritional soil stress on interactions between iron-reducing bacteria (the main iron-reducing agents in rhizosphere and soil) and rice roots (iron-excluding power and membrane permeability) are discussed and a mechanism for iron... Mostrar Tudo |
Palavras-Chave: |
Chemophysical properties; Propriedade fisicoquimica; Soils; Teor de ferro; Toxicidade. |
Thesagro: |
Ferro; Solo; Toxidez. |
Thesaurus Nal: |
Asia; iron; soil; toxicity. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02308nam a2200313 a 4500 001 1381612 005 2010-09-14 008 1982 bl uuuu u0uu1 u #d 100 1 $aBENCKISER, G. 245 $aPhysicochemical characterization of iron-toxic soils in some Asian countries. 260 $aPhilippines: IRRI$c1982 300 $a11 p.$cil. 490 $a(IRRI. Research paper, 85). 520 $aHigh Fe(II) levels caused by low pH and relatively high amounts of active iron and aggravated by a continuous Fe supply from upwelling or lateral seepage from adjacent hills have been blamed for excessive iron uptake. If iron toxicity is induced directly or indirectly by one or more constaints, the same stresses should be shared by soils that show bronzing and/or yellowing. To examine this hypothesis, Physicochemical analyses of soils (up to 40 cm depth) and intoxified leaves were made at different sites in the Philippines, Sri Lanka, Indonesia, China, and Liberia. Soil and plant data were correlated and sites were grouped by principal component and cluster analysis. The following conclusions were drawn: - Although iron-toxic soils were usually slightly acid, there was no correlation between pH and high Fe concentrations in the leaves. - The negative correlations between Fe in the intoxified leaves and active Fe in the soils indicate indirect relationships. - Significant correlations between iron in the rice leaves and cation exchange capacity (CEC) or exchangeable Ca and low P and exchangeable K values are characteristics shared by the soils, indicating the importance of soil nutrient status as a prerequisite for iron toxicity. The effect of a multinutritional soil stress on interactions between iron-reducing bacteria (the main iron-reducing agents in rhizosphere and soil) and rice roots (iron-excluding power and membrane permeability) are discussed and a mechanism for iron intoxification is proposed. 650 $aAsia 650 $airon 650 $asoil 650 $atoxicity 650 $aFerro 650 $aSolo 650 $aToxidez 653 $aChemophysical properties 653 $aPropriedade fisicoquimica 653 $aSoils 653 $aTeor de ferro 653 $aToxicidade 700 1 $aOTTOW, J. C. G. 700 1 $aSANTIAGO, S. 700 1 $aWATANABE, I.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
Biblioteca(s): |
Embrapa Soja. |
Data corrente: |
06/10/2010 |
Data da última atualização: |
07/12/2012 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
VITORINO, J. C.; SILLA, P. R.; CAMARGO-BRUNETTO, M. A. de.; BINNECK, E. |
Afiliação: |
JOSUÉ CRISPIM VITORINO, UEL; PAULO ROBERTO SILLA, UEL; M. A. DE CAMARGO-BRUNETTO, UEL; ELISEU BINNECK, CNPSO. |
Título: |
Abordagem computacional para a identificação de elementos cis-regulatóriso no genoma da soja. |
Ano de publicação: |
2010 |
Fonte/Imprenta: |
In: JORNADA ACADÊMICA DA EMBRAPA SOJA, 5., 2010, Londrina. Resumos... Londrina: Embrapa Soja, 2010. p. 95-97. (Embrapa Soja. Documentos, 323). Editado por Odilon Ferreira Saraiva, Paula Geron Saiz Melo. |
Idioma: |
Português |
Palavras-Chave: |
Genoma de soja. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/71511/1/ID-31371.pdf
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Marc: |
LEADER 00625nam a2200145 a 4500 001 1863781 005 2012-12-07 008 2010 bl uuuu u00u1 u #d 100 1 $aVITORINO, J. C. 245 $aAbordagem computacional para a identificação de elementos cis-regulatóriso no genoma da soja. 260 $aIn: JORNADA ACADÊMICA DA EMBRAPA SOJA, 5., 2010, Londrina. Resumos... Londrina: Embrapa Soja, 2010. p. 95-97. (Embrapa Soja. Documentos, 323). Editado por Odilon Ferreira Saraiva, Paula Geron Saiz Melo.$c2010 653 $aGenoma de soja 700 1 $aSILLA, P. R. 700 1 $aCAMARGO-BRUNETTO, M. A. de. 700 1 $aBINNECK, E.
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Embrapa Soja (CNPSO) |
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