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| Registros recuperados : 56 | |
| 4. |  | 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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| 6. | | CANIATO, F. F.; GUIMARAES, C. T.; SCHAFFERT, R. E.; KOCHIAN, L. V.; MAGALHAES, J. V. D. Association mapping for aluminum tolerance in candidate regions of the Altsb locus in sorghum. In: CONGRESSO BRASILEIRO DE GENÉTICA, 55., 2009, Águas de Lindóia, SP. Resumos... Ribeirão Preto: Sociedade Brasileira de Genética, 2009. p. 150.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 11. | | MAGALHAES, J. V.; SOUSA, S. M. de; GUIMARAES, C. T.; KOCHIAN, L. V. The role of root morphology and architecture in phosphorus acquisiton: physiological, genetic, and molecular basis. In: HOSSAIN, M. A.; KAMIYA, T.; BURRITT, D. J.; PHAN TRAN, L.-S.; FUJIWARA, T. (Ed.). Plant macronutrient use efficiency: molecular and genomic perspectives in crop plants. London: Academic Press, 2017. cap. 7, p. 123-147.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 13. | | ALVES, V. M. C.; MAGALHAES, J. V. de; KOCHIAN, L. V.; PARENTONI, S. N.; PAIVA, E.; GARVIN, D. F. Acumulação de alumínio em ápices de raízes de milho. In: REUNIAO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRICAO DE PLANTAS, 24.; REUNIAO BRASILEIRA SOBRE MICORRIZAS, 8.; SIMPOSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 6.; REUNIAO BRASILEIRA DE BIOLOGIA DO SOLO, 3., 2000, Santa Maria, RS. Biodinâmica do solo: guia do congressista. [Viçosa, MG]: Sociedade Brasileira de Ciência do Solo; [São Paulo]: Sociedade Brasileira de Microbiologia; Santa Maria, RS: Universidade Federal de Santa Maria, Departamento de Solos, 2000. Fertbio 2000. p. 151.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 14. | | CANIATO, F. F.; HAMBLIN, M. T.; GUIMARAES, C. T.; ZHANG, Z.; SCHAFFERT, R. E.; KOCHIAN, L. V.; MAGALHAES, J. V. Association mapping provides insights into the origin and the fine structure of the sorghum aluminum tolerance locus, AltSB. Plos One, San Francisco, v. 9, n. 1, p. 1-12, 2014.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 15. | | HUFNAGEL, B.; GUIMARÃES, C. T.; CRAFT, E. J.; SHAFF, J. E.; SCHAFFERT, R. E.; KOCHIAN, L. V.; MAGALHAES, J. V. Exploiting sorghum genetic diversity for enhanced aluminum tolerance: allele mining based on the AltSB locus. Scientific Reports, v. 8, p. 1-13, July 2018. Article number: 10094.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 16. | | ALVES, V. M. C.; MAGALHAES, J. V. de; SHAFF, J.; SCHAFFERT, R. E.; GUIMARAES, C. T.; KOCHIAN, L. V. Exsudação de citrato e tolerânica ao alumínio em sorgo. In: CONGRESSO NACIONAL DE MILHO E SORGO, 26.; SIMPÓSIO BRASILEIRO SOBRE A LAGARTA-DO-CARTUCHO, SPODOPTERA FRUGIPERDA, 2.; SIMPÓSIO SOBRE COLLETOTRICHUM GRAMINICOLA, 1., 2006, Belo Horizonte. Inovação para sistemas integrados de produção: trabalhos apresentados. [Sete Lagoas]: ABMS, 2006. 1 CD-ROM.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 17. | | PAPERNIK, L. A.; BETHEA, A. S.; SINGLETON, T. E.; MAGALHAES, J. V.; GARVIN, D. F.; KOCHIAN, L. V. Physiological basis of reduced Al tolerance in ditelosomic lines of Chinese spring wheat. Planta, New York, v. 212, n. 5/6, p. 829-834, 2001.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 18. | | LIU, J.; LUO, X.; SHAFF, J.; LIANG, C.; JIA, X.; LI, Z.; MAGALHAES, J.; KOCHIAN, L. V. A promoter-swap strategy between the AtALMT and AtMATE genes increased Arabidopsis aluminum resistance and improved carbon-use efficiency for aluminum resistance. The Plant Journal, Oxford, v. 71, p. 327-337, 2012.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 19. | | 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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| 20. | | MAGALHAES, J. V.; GARVIN, D. F.; WANG, Y. H.; SORRELLS, M. E.; KLEIN, P. E.; SCHAFFERT, R. E.; LI, L.; KOCHIAN, L. V. Comparative mapping of a major aluminum tolerance gene in sorghum and other species in the poaceae. Genetics, Maryland, v. 167, n. 4, p. 1905-1914, 2004.| Biblioteca(s): Embrapa Milho e Sorgo. |
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| Registros recuperados : 56 | |
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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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