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Registro Completo |
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
03/08/2010 |
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Data da última atualização: |
27/09/2022 |
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Tipo da produção científica: |
Boletim de Pesquisa e Desenvolvimento |
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Autoria: |
SANTOS, M. R. A. dos; INNECCO, R. |
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Afiliação: |
MAURICIO REGINALDO ALVES DOS SANTOS, CPAF-RO; Renato Innecco, Universidade Federal do Ceará. |
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Título: |
Efeitos de horários de colheita no teor e na composição do óleo essencial de erva-cidreira brasileira. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Porto Velho: Embrapa Rondônia, 2005. |
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Série: |
(Embrapa Rondônia. Boletim de Pesquisa e Desenvolvimento, 27). |
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Idioma: |
Português |
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Conteúdo: |
O objetivo do trabalho foi avaliar o efeito de diferentes horários de colheita no teor e composição do óleo essencial da erva-cidreira brasileira (Lippia alba (Mill.) N.E. Brown), quimiotipo limoneno-carvona, nas estações chuvosa e seca do Ceará. As folhas foram colhidas às 7, 9, 11, 13, 15 e 17 horas. Utilizou-se o delineamento inteiramente casualizado, com quatro repetições de 500 g de folha fresca. Na estação seca, a obtenção de óleo essencial foi superior à estação chuvosa. Em ambos os casos, os maiores teores foram obtidos às 15 horas. Os teores de limoneno e carvona foram afetados pelo horário de colheita. |
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Palavras-Chave: |
Carvona; Limoneno. |
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Thesagro: |
Lippia Alba; Planta Medicinal; Verbenaceae. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/24763/1/bpd27-oleoessencialdeervacidreira.pdf
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Marc: |
LEADER 01260nam a2200193 a 4500
001 1859155
005 2022-09-27
008 2005 bl uuuu u0uu1 u #d
100 1 $aSANTOS, M. R. A. dos
245 $aEfeitos de horários de colheita no teor e na composição do óleo essencial de erva-cidreira brasileira.$h[electronic resource]
260 $aPorto Velho: Embrapa Rondônia$c2005
490 $a(Embrapa Rondônia. Boletim de Pesquisa e Desenvolvimento, 27).
520 $aO objetivo do trabalho foi avaliar o efeito de diferentes horários de colheita no teor e composição do óleo essencial da erva-cidreira brasileira (Lippia alba (Mill.) N.E. Brown), quimiotipo limoneno-carvona, nas estações chuvosa e seca do Ceará. As folhas foram colhidas às 7, 9, 11, 13, 15 e 17 horas. Utilizou-se o delineamento inteiramente casualizado, com quatro repetições de 500 g de folha fresca. Na estação seca, a obtenção de óleo essencial foi superior à estação chuvosa. Em ambos os casos, os maiores teores foram obtidos às 15 horas. Os teores de limoneno e carvona foram afetados pelo horário de colheita.
650 $aLippia Alba
650 $aPlanta Medicinal
650 $aVerbenaceae
653 $aCarvona
653 $aLimoneno
700 1 $aINNECCO, R.
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Registro original: |
Embrapa Rondônia (CPAF-RO) |
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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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