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| Registros recuperados : 22 | |
| 3. |  | PINEROS, M. A.; SHAFF, J. E.; MANSLANK, H. S.; ALVES, V. M. C.; KOCHIAN, L. V. Aluminum resistance in maize cannot be solely explained by root organic acid exudation. A comparative physiological study Plant Physiology, Bethesda, v. 137, n. 1, p. 231-241, 2005.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 9. | | KOCHIAN, L.; HOEKENGA, O.; MAGALHAES, J.; PINEROS, M.; ALVES, V.; MARON, L.; MASON, P.; GUIMARAES, C.; SCHAFFERT, R. Integrating genomic, molecular genetic and physiological approaches to identify plant aluminum tolerance genes and their associated physilogical mechanisms. In: INTERNATIONAL PLANT NUTRITION COLLOQUIUM, 15., 2005, Beijing, China. Proceedings... Beijing: Tsinghua University, 2005. p. 18-19.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 10. | | KOCHIAN, L.; MAGALHAES, J.; LIU, J.; HOEKENGA, O.; PINEROS, M.; SCHAFFERT, R. E.; SHAFF, J.; ALVES, V. Molecular approaches to rhizosphere research: identification and characterization of aluminum tolerance genes and their use to improve acid soil tolerance. In: INTERNATIONAL CONFERENCE RHIZOSPHERE , 2., 2007, Montpellier. Book of abstracts... Montpellier: INRA, 2007.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 11. | | CANÇADO, G. M. A.; PINEROS, M. A.; MARON, L. G.; SHAFF, J.; CAMARGO, S. R.; MENOSSI, M.; ALVES, V. M. C.; KOCHIAN, L. V. Cloning and characterization of an ALMT1 homologue gene in Maize. In: INTERNATIONAL PLANT & ANIMAL GENOMES CONFERENCE, 15., 2007, San Diego, CA. [Proceedings...]. [S. l.: s.n.], 2007.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 12. | | KOCHIAN, L. V.; PENCE, N. S.; LETHAM, D. L. D.; PINEROS, M. A.; MAGALHAES, J. V.; HOEKENGA, O. A.; GARVIN, D. F. Mechanisms of metal resistance in plants: aluminum and heavy metals. Plant and Soil, The Hague, v. 247, n.1 , p. 109-119, 2002.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 13. | | LIU, J.; MAGALHAES, J. V. de; GUIMARAES, C. T.; LANA, U. G. de P.; HOEKENGA, O.; SHAFF, J.; PINEROS, M.; WANG, Y.; SCHAFFERT, R. E.; KOCHIAN, L. Molecular cloning and characterization of AltSB, a major aluminum tolerance gene in sorghum. In: INTERNATIONAL PLANT & ANIMAL GENOMES CONFERENCE, 15., 2007, San Diego, CA. [Proceedings...]. [S. l.: s.n.], 2007.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 14. | | MATONYEI, T. K.; CHEPROT, R. K.; LIU, J.; PIÑEROS, M. A.; SHAFF, J. E.; GUDU, S.; WERE, B.; MAGALHAES, J. V.; KOCHIAN, L. V. Physiological and molecular analysis of aluminum tolerance in selected Kenyan maize lines. Plant and Soil, Dordrecht, v. 377, p. 357-367, 2014.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 15. | | MARON, L. G.; PIÑEROS, M. A.; GUIMARAES, C. T.; MAGALHAES, J. V. de; PLEIMAN, J. K.; MAO, C.; SHAFF, J.; BELICUAS, S. N. J; KOCHIAN, L. V. Two functionally distinct members of the MATE (multi-drug and toxic compound extrusion) family of transporters potentially underlie two major aluminum tolerance QTLs in maize. The Plant Journal, Oxford, v. 61, n. 5, p. 728-740, 2010.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 16. | | MELO, J. O.; LANA, U. G. de P.; PIÑEROS, M. A.; ALVES, V. M. C.; GUIMARAES, C. T.; LIU, J.; ZHENG, Y.; ZHONG, S.; FEI, Z.; MARON, L. G.; SCHAFFERT, R. E.; KOCHIAN, L. V.; MAGALHAES, J. V. de. Incomplete transfer of accessory loci influencing SbMATE expression underlies genetic background effects for aluminum tolerance in sorghum. The Plant Journal, Oxford, v. 73, p. 276-288, Jan. 2013.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 17. | | ALVES, V. M. C.; MAGALHAES, J. V. de; SHAFF, J. E.; PINEROS, M. A.; PURCINO, A. A. C.; PARENTONI, S. N.; PITTA, G. V. E.; PRATES, H. T.; SCHAFFERT, R. E.; KOCHIAN, L. V. Exsudação de ácidos orgânicos como mecanismo de tolerância a alumínio em milho. In: CONGRESSO BRASILEIRO DE FISIOLOGIA VEGETAL, 8., 2001, Ilhéus. Anais... Ilhéus: SBFV, 2001. 1 CD-ROM.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 18. | | MAGALHAES, J. V. de; KOCHIAN, L.; LIU, J.; GUIMARAES, C.; LANA, U.; ALVES, V.; WANG, Y.; SCHAFFERT, R. E.; HOEKENGA, O.; PINEROS, M.; SHAFF, J.; KLEIN, P.; CARNEIRO, N.; COELHO, C.; TRICK, H.; CANIATO, F.; KRESOVICH, S.; MITCHELL, S. Positional cloning and association analysis of a mate gene that confers aluminum tolerance in sorghum via the AltSB locus. In: INTERNATIONAL PLANT & ANIMAL GENOMES CONFERENCE, 16., 2008, San Diego, CA. [Proceedings...]. [S. l.: s.n.], 2008. p. 13.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 19. | | MAGALHAES, J. V. de; LIU, J.; ALVES, V. M. C.; GUIMARAES, C. T.; WANG, Y.; LANA, U. G. de P.; SCHAFFERT, R. E.; KLEIN, P.; HOEKENGA, O.; PINEROS, M.; KOCHIAN, L. Positional cloning and characterization of AltSB, a major aluminum tolerance gene in sorghum: toward the identification of the molecular and physiological basis of allelic effects. In: INTERNATIONAL PLANT & ANIMAL GENOMES CONFERENCE, 15., 2007, San Diego, CA. [Proceedings...]. [S. l.: s.n.], 2007.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 20. | | MAGALHAES, J.; KOCHIAN L.; LIU, J.; GUIMARAES, C.; LANA, U.; ALVES, V.; WANG, Y.; SCHAFFERT, R.; HOEKENGA, O.; PINEROS, M.; KLEIN, P.; CARNEIRO, N.; COELHO, C.; TRICK, H.; CANIATO, F.; KRESOVOCH, S.; MITCHELL, S. Positional clonning and association analysis of a gene that confers aluminum tolerance in Sorghum via the ALTsb locus. In: REUNIÓN LATINOAMERICANA, 13.; REUNIÓN ARGENTINA DE FISIOLOGIA VEGETAL, 27., 2008, Rosario. Resúmenes de conferencias, simposios y trabajos. Rosario: Asociación Argentina de Fisiologia Vegetal, 2008. p. 13.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| Registros recuperados : 22 | |
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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. |
Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
06/10/2003 |
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Data da última atualização: |
05/06/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PINEROS, M. A.; MAGALHAES, J. V.; ALVES, V. M. C.; KOCHIAN, L. V. |
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Afiliação: |
JURANDIR VIEIRA DE MAGALHAES, CNPMS; VERA MARIA CARVALHO ALVES, CNPMS. |
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Título: |
The physiology and biophysics of an aluminum tolerance mechanism based on root citrate exudation in maize. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Plant Physiology, Bethesda, v. 129, p. 1194-1206, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
Al-induced release of Al-chelating ligands (primarily organic acids) into the rhizosphere from the root apex has been identified as a major Al tolerance mechanism in a number of plants species. In the present study, we conducted physiological investigations to study the spatial and temporal characteristcs of Al-activated root organic acid exudation, as well as changes in root organic acid content and Al accumulation, in an AL-tolerant maize (Zea mays) single cross (SLP 181/71 x Cateto Colombia 96/71). These investigations were integrated with biophysical studies using the patch-clamp technique to examine Al-activated anion channel activity in protoplasts isolated from different regions of the mazie root. Exposure to Al nearly instantaneously activated a concentration-dependent citrate release, which saturated at rates close to 0,5 nmol citrate h1 root -1. with the half-maximal rates of citrate release occurring at about 20 um Al3+ activity. Comparison of citrate exudation rates between decapped and capped roots indicated the root cap does not play a major role in perceiving the Al signal or in the exudation process. Spatial analysis indicated that the predominant citrate exudation is not confined to the root apex, but could be found as far as 5 cm beyond the root cap, involving cortex and stelar cells. Patch clamp recordings obtained in whole-cell and outside-out patches confirmed the presence of an Al-inducible plasma membrane anion channel in protoplasts isolated from stelar or cortical tissues. The unitary conductance of this channel was 23 to 55 pS. Our results suggest that this transporter mediates the Al-induced citrate release observed in the intact tissue. In addition to the rapid Al activation of citrate release , a slower, Al-inducible increase in root citrate content was also observed. These findings led us to speculate that in addition to the Al exclusion mechanism based on root citrate exudation, a second internal Al tolerance mechanism may be operating based on Al-inducible changes in organic acid synthesis and compartmentation. We discuss our findings in terms of recent genetic studies of Al tolerance in maize, which suggest that Al tolerance in maize is a complex trait. MenosAl-induced release of Al-chelating ligands (primarily organic acids) into the rhizosphere from the root apex has been identified as a major Al tolerance mechanism in a number of plants species. In the present study, we conducted physiological investigations to study the spatial and temporal characteristcs of Al-activated root organic acid exudation, as well as changes in root organic acid content and Al accumulation, in an AL-tolerant maize (Zea mays) single cross (SLP 181/71 x Cateto Colombia 96/71). These investigations were integrated with biophysical studies using the patch-clamp technique to examine Al-activated anion channel activity in protoplasts isolated from different regions of the mazie root. Exposure to Al nearly instantaneously activated a concentration-dependent citrate release, which saturated at rates close to 0,5 nmol citrate h1 root -1. with the half-maximal rates of citrate release occurring at about 20 um Al3+ activity. Comparison of citrate exudation rates between decapped and capped roots indicated the root cap does not play a major role in perceiving the Al signal or in the exudation process. Spatial analysis indicated that the predominant citrate exudation is not confined to the root apex, but could be found as far as 5 cm beyond the root cap, involving cortex and stelar cells. Patch clamp recordings obtained in whole-cell and outside-out patches confirmed the presence of an Al-inducible plasma membrane anion channel in protoplasts isolated from stel... Mostrar Tudo |
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Thesagro: |
Alumínio; Milho. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02777naa a2200181 a 4500
001 1487223
005 2018-06-05
008 2002 bl uuuu u00u1 u #d
100 1 $aPINEROS, M. A.
245 $aThe physiology and biophysics of an aluminum tolerance mechanism based on root citrate exudation in maize.$h[electronic resource]
260 $c2002
520 $aAl-induced release of Al-chelating ligands (primarily organic acids) into the rhizosphere from the root apex has been identified as a major Al tolerance mechanism in a number of plants species. In the present study, we conducted physiological investigations to study the spatial and temporal characteristcs of Al-activated root organic acid exudation, as well as changes in root organic acid content and Al accumulation, in an AL-tolerant maize (Zea mays) single cross (SLP 181/71 x Cateto Colombia 96/71). These investigations were integrated with biophysical studies using the patch-clamp technique to examine Al-activated anion channel activity in protoplasts isolated from different regions of the mazie root. Exposure to Al nearly instantaneously activated a concentration-dependent citrate release, which saturated at rates close to 0,5 nmol citrate h1 root -1. with the half-maximal rates of citrate release occurring at about 20 um Al3+ activity. Comparison of citrate exudation rates between decapped and capped roots indicated the root cap does not play a major role in perceiving the Al signal or in the exudation process. Spatial analysis indicated that the predominant citrate exudation is not confined to the root apex, but could be found as far as 5 cm beyond the root cap, involving cortex and stelar cells. Patch clamp recordings obtained in whole-cell and outside-out patches confirmed the presence of an Al-inducible plasma membrane anion channel in protoplasts isolated from stelar or cortical tissues. The unitary conductance of this channel was 23 to 55 pS. Our results suggest that this transporter mediates the Al-induced citrate release observed in the intact tissue. In addition to the rapid Al activation of citrate release , a slower, Al-inducible increase in root citrate content was also observed. These findings led us to speculate that in addition to the Al exclusion mechanism based on root citrate exudation, a second internal Al tolerance mechanism may be operating based on Al-inducible changes in organic acid synthesis and compartmentation. We discuss our findings in terms of recent genetic studies of Al tolerance in maize, which suggest that Al tolerance in maize is a complex trait.
650 $aAlumínio
650 $aMilho
700 1 $aMAGALHAES, J. V.
700 1 $aALVES, V. M. C.
700 1 $aKOCHIAN, L. V.
773 $tPlant Physiology, Bethesda$gv. 129, p. 1194-1206, 2002.
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