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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
14/12/2005 |
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Data da última atualização: |
30/05/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PINEROS, M. A.; SHAFF, J. E.; MANSLANK, H. S.; ALVES, V. M. C.; KOCHIAN, L. V. |
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Afiliação: |
VERA MARIA CARVALHO ALVES, CNPMS. |
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Título: |
Aluminum resistance in maize cannot be solely explained by root organic acid exudation. A comparative physiological study. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Plant Physiology, Bethesda, v. 137, n. 1, p. 231-241, 2005. |
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Idioma: |
Inglês |
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Conteúdo: |
Root apical aluminum (Al) exclusion via Al-activated root citrate exudation is widely accepted as the main Al-resistance mechanism operating in maize (Zea mays) roots. Nonetheless, the correlation between Al resistance and this Al-exclusion mechanism has not been tested beyond a very small number of Al-resistant and Al-sensitive maize lines. In this study, we conducted a comparative study of the physiology of Al resistance using six different maize genotypes that capture the range of maize Al resistance and differ significantly in their genetic background (three Brazilian and three North American genotypes). In these maize lines, we were able to establish a clear correlation between root tip Al exclusion (based on root Al content) and Al resistance. Both Al-resistant genotypes and three of the four Al-sensitive lines exhibited a significant Al-activated citrate exudation, with no evidence for Al activation of root malate or phosphate release. There was a lack of correlation between differential Al resistance and root citrate exudation for the six maize genotypes; in fact, one of the Al-sensitive lines, Mo17, had the largest Al-activated citrate exudation of all of the maize lines. Our results indicate that although root organic acid release may play a role in maize Al resistance, it is clearly not the only or the main resistance mechanism operating in these maize roots. A number of other potential Al-resistance mechanisms were investigated, including release of other Al-chelating ligands, Al-induced alkalinization of rhizosphere pH, changes in internal levels of Al-chelating compounds in the root, and Al translocation to the shoot. However, we were unsuccessful in identifying additional Al-resistance mechanisms in maize. It is likely that a purely physiological approach may not be sufficient to identify these novel Al-resistance mechanisms in maize and this will require an interdisciplinary approach integrating genetic, molecular, and physiological investigations. MenosRoot apical aluminum (Al) exclusion via Al-activated root citrate exudation is widely accepted as the main Al-resistance mechanism operating in maize (Zea mays) roots. Nonetheless, the correlation between Al resistance and this Al-exclusion mechanism has not been tested beyond a very small number of Al-resistant and Al-sensitive maize lines. In this study, we conducted a comparative study of the physiology of Al resistance using six different maize genotypes that capture the range of maize Al resistance and differ significantly in their genetic background (three Brazilian and three North American genotypes). In these maize lines, we were able to establish a clear correlation between root tip Al exclusion (based on root Al content) and Al resistance. Both Al-resistant genotypes and three of the four Al-sensitive lines exhibited a significant Al-activated citrate exudation, with no evidence for Al activation of root malate or phosphate release. There was a lack of correlation between differential Al resistance and root citrate exudation for the six maize genotypes; in fact, one of the Al-sensitive lines, Mo17, had the largest Al-activated citrate exudation of all of the maize lines. Our results indicate that although root organic acid release may play a role in maize Al resistance, it is clearly not the only or the main resistance mechanism operating in these maize roots. A number of other potential Al-resistance mechanisms were investigated, including release of other Al-chel... Mostrar Tudo |
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Thesagro: |
Milho. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02573naa a2200181 a 4500
001 1489062
005 2018-05-30
008 2005 bl uuuu u00u1 u #d
100 1 $aPINEROS, M. A.
245 $aAluminum resistance in maize cannot be solely explained by root organic acid exudation. A comparative physiological study.$h[electronic resource]
260 $c2005
520 $aRoot apical aluminum (Al) exclusion via Al-activated root citrate exudation is widely accepted as the main Al-resistance mechanism operating in maize (Zea mays) roots. Nonetheless, the correlation between Al resistance and this Al-exclusion mechanism has not been tested beyond a very small number of Al-resistant and Al-sensitive maize lines. In this study, we conducted a comparative study of the physiology of Al resistance using six different maize genotypes that capture the range of maize Al resistance and differ significantly in their genetic background (three Brazilian and three North American genotypes). In these maize lines, we were able to establish a clear correlation between root tip Al exclusion (based on root Al content) and Al resistance. Both Al-resistant genotypes and three of the four Al-sensitive lines exhibited a significant Al-activated citrate exudation, with no evidence for Al activation of root malate or phosphate release. There was a lack of correlation between differential Al resistance and root citrate exudation for the six maize genotypes; in fact, one of the Al-sensitive lines, Mo17, had the largest Al-activated citrate exudation of all of the maize lines. Our results indicate that although root organic acid release may play a role in maize Al resistance, it is clearly not the only or the main resistance mechanism operating in these maize roots. A number of other potential Al-resistance mechanisms were investigated, including release of other Al-chelating ligands, Al-induced alkalinization of rhizosphere pH, changes in internal levels of Al-chelating compounds in the root, and Al translocation to the shoot. However, we were unsuccessful in identifying additional Al-resistance mechanisms in maize. It is likely that a purely physiological approach may not be sufficient to identify these novel Al-resistance mechanisms in maize and this will require an interdisciplinary approach integrating genetic, molecular, and physiological investigations.
650 $aMilho
700 1 $aSHAFF, J. E.
700 1 $aMANSLANK, H. S.
700 1 $aALVES, V. M. C.
700 1 $aKOCHIAN, L. V.
773 $tPlant Physiology, Bethesda$gv. 137, n. 1, p. 231-241, 2005.
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Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
06/05/2005 |
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Data da última atualização: |
14/12/2017 |
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Autoria: |
WENDLING, I.; OAIVA, H. N. de; GONÇALVES, W. |
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Título: |
Técnicas de produção de mudas de plantas ornamentais. |
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Edição: |
2. ed. rev. ampl. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Viçosa: Aprenda Fácil, 2005. |
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Páginas: |
223 p. |
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Série: |
(Coleção Jardinagem e Paisagismo; Série Produção de Mudas Ornamentais, 3). |
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ISBN: |
85-7630-014-1 |
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Idioma: |
Português |
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Palavras-Chave: |
Enxertia; Estaquia; Miniestauia; Produção sexuada. |
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Thesagro: |
Manejo; Mergulhia; Muda; Planta Ornamental; Produção; Propagação Vegetativa. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00800nam a2200289 a 4500
001 1282068
005 2017-12-14
008 2005 bl uuuu 00u1 u #d
020 $a85-7630-014-1
100 1 $aWENDLING, I.
245 $aTécnicas de produção de mudas de plantas ornamentais.
250 $a2. ed. rev. ampl.
260 $aViçosa: Aprenda Fácil$c2005
300 $a223 p.
490 $a(Coleção Jardinagem e Paisagismo; Série Produção de Mudas Ornamentais, 3).
650 $aManejo
650 $aMergulhia
650 $aMuda
650 $aPlanta Ornamental
650 $aProdução
650 $aPropagação Vegetativa
653 $aEnxertia
653 $aEstaquia
653 $aMiniestauia
653 $aProdução sexuada
700 1 $aOAIVA, H. N. de
700 1 $aGONÇALVES, W.
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