| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Milho e Sorgo. |
|
Data corrente: |
14/12/2005 |
|
Data da última atualização: |
30/05/2018 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
PINEROS, M. A.; SHAFF, J. E.; MANSLANK, H. S.; ALVES, V. M. C.; KOCHIAN, L. V. |
|
Afiliação: |
VERA MARIA CARVALHO ALVES, CNPMS. |
|
Título: |
Aluminum resistance in maize cannot be solely explained by root organic acid exudation. A comparative physiological study |
|
Ano de publicação: |
2005 |
|
Fonte/Imprenta: |
Plant Physiology, Bethesda, v. 137, n. 1, p. 231-241, 2005. |
|
Idioma: |
Inglês |
|
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 |
|
Thesagro: |
Milho. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02572naa 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.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Algodão. |
|
Data corrente: |
19/12/2012 |
|
Data da última atualização: |
19/12/2012 |
|
Tipo da produção científica: |
Resumo em Anais de Congresso |
|
Autoria: |
FREITAS, J. G.; FREITAS, J. G.; SILVA, G. A. da; DOURADO, S. O.; SILVA, F. de S.; SILVA, J. M. da; SILVA, C. F. L. da. |
|
Afiliação: |
JALMI GUEDES FREITAS, CNPA; Jalmi Guedes Freitas, Estagiários da Embrapa Algodão e estudante do CETEP; GILVANDO ALMEIDA DA SILVA, CNPA; Sabrina Oliveira Dourado, Estagiária da Embrapa Algodão e estudante do CETEP; Francielle de Souza Silva, Estagiária da Embrapa Algodão e estudante do CETEP; João Mendes da Silva, Estagiário da Embrapa Algodão e estudante do CETEP; Cristianne Félix Leonel da Silva, Estagiária da Embrapa Algodão e estudante do CETEP. |
|
Título: |
Avaliação da produtividade das ordens primária, secundária e terciária de genótipos de mamoneira de porte baixo em Irecê-BA. |
|
Ano de publicação: |
2012 |
|
Fonte/Imprenta: |
CONGRESSO BRASILEIRO DE MAMONA, 5.; SIMPÓSIO INTERNACIONAL DE OLEAGINOSAS ENERGÉTICAS, 2.; FÓRUM CAPIXABA DE PINHÃO-MANSO, 1., 2012, Guarapari. Desafios e Oportunidades: anais. Campina Grande: Embrapa Algodão, 2012. |
|
Páginas: |
p. 350 |
|
Idioma: |
Português |
|
Palavras-Chave: |
LINHAGENS; MELHORAMENTO GENÉTICO. |
|
Thesagro: |
Mamona; Produção; Ricinus Communis. |
|
Categoria do assunto: |
-- |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/72554/1/MEL-001-P.169.pdf
|
|
Marc: |
LEADER 00901nam a2200241 a 4500
001 1943142
005 2012-12-19
008 2012 bl uuuu u00u1 u #d
100 1 $aFREITAS, J. G.
245 $aAvaliação da produtividade das ordens primária, secundária e terciária de genótipos de mamoneira de porte baixo em Irecê-BA.
260 $aCONGRESSO BRASILEIRO DE MAMONA, 5.; SIMPÓSIO INTERNACIONAL DE OLEAGINOSAS ENERGÉTICAS, 2.; FÓRUM CAPIXABA DE PINHÃO-MANSO, 1., 2012, Guarapari. Desafios e Oportunidades: anais. Campina Grande: Embrapa Algodão$c2012
300 $ap. 350
650 $aMamona
650 $aProdução
650 $aRicinus Communis
653 $aLINHAGENS
653 $aMELHORAMENTO GENÉTICO
700 1 $aFREITAS, J. G.
700 1 $aSILVA, G. A. da
700 1 $aDOURADO, S. O.
700 1 $aSILVA, F. de S.
700 1 $aSILVA, J. M. da
700 1 $aSILVA, C. F. L. da
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Algodão (CNPA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
