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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
08/03/1995 |
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Data da última atualização: |
08/03/1995 |
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Autoria: |
CORBINEAU, F.; POLJAKOFF-MAYBER, A.; COME, D. |
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Afiliação: |
Univ. Pierre et Marie Curie; Idem; The Hebrew Univ. of Jerusalem. |
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Título: |
Responsiveness to abscisic acid of embryos of dormant oat (Avena sativa) seeds: involvement of ABA-inducible proteins. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Physiologia Plantarum, v.83, p.1-6, 1991. |
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Idioma: |
Inglês |
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Notas: |
Separata. |
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Conteúdo: |
Abscisic acid (ABA) inhibited the germination of embryos isolated fromoat (Avena sativa L.) dormant seeds. The inhibition increased with ABAconcentration. The embryos were 1000 times more responsive to ABA at 30oC than at 10oC (30oC being the temperature at which dormancy is expressed). Exposure of embryos to 0.5 uM ABA for less than 8h did not affect subsequent germination in water, and did not induce synthesis of new proteins. Exposure for at least 14h was necessary to induce subsequent inhibition of germination. Such long exposure to ABA also affectedprotein synthesis. The molecular weights of the main ABA-inducible proteins were in the range between 44 and 24kDa. Synthesis of small polypeptides, around 10 and 6 kDa was also induced. Synthesis of most of these ABA-inducible proteins disappeared when embryos were transferredto water. The general results suggest that the presence of ABA was necessary to maintain the synthesis of ABA-inducible proteins; on removalof ABA their synthesis ceased. No apparent correlation between these proteins and germination was revealed. However, a 26 kDa band was observed in the extract of control embryos imbibed for 24h in water; this band was not present after 8 or 16h imbibition and was also absent in extracts of ABA treated embryos. |
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Palavras-Chave: |
Sementes. |
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Thesagro: |
Dormência; Fisiologia Vegetal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01847naa a2200193 a 4500
001 1074648
005 1995-03-08
008 1991 bl --- 0-- u #d
100 1 $aCORBINEAU, F.
245 $aResponsiveness to abscisic acid of embryos of dormant oat (Avena sativa) seeds$binvolvement of ABA-inducible proteins.
260 $c1991
500 $aSeparata.
520 $aAbscisic acid (ABA) inhibited the germination of embryos isolated fromoat (Avena sativa L.) dormant seeds. The inhibition increased with ABAconcentration. The embryos were 1000 times more responsive to ABA at 30oC than at 10oC (30oC being the temperature at which dormancy is expressed). Exposure of embryos to 0.5 uM ABA for less than 8h did not affect subsequent germination in water, and did not induce synthesis of new proteins. Exposure for at least 14h was necessary to induce subsequent inhibition of germination. Such long exposure to ABA also affectedprotein synthesis. The molecular weights of the main ABA-inducible proteins were in the range between 44 and 24kDa. Synthesis of small polypeptides, around 10 and 6 kDa was also induced. Synthesis of most of these ABA-inducible proteins disappeared when embryos were transferredto water. The general results suggest that the presence of ABA was necessary to maintain the synthesis of ABA-inducible proteins; on removalof ABA their synthesis ceased. No apparent correlation between these proteins and germination was revealed. However, a 26 kDa band was observed in the extract of control embryos imbibed for 24h in water; this band was not present after 8 or 16h imbibition and was also absent in extracts of ABA treated embryos.
650 $aDormência
650 $aFisiologia Vegetal
653 $aSementes
700 1 $aPOLJAKOFF-MAYBER, A.
700 1 $aCOME, D.
773 $tPhysiologia Plantarum$gv.83, p.1-6, 1991.
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Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
10/01/2007 |
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Data da última atualização: |
20/10/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
SIMPSON, A. J.; SONG, G.; SMITH, E.; LAM, B.; NOVOTNY, E. H.; HAYES, M. H. B. |
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Afiliação: |
ANDRE J. SIMPSON, UNIVERSITY OF TORONTO; GUIXUE SONG, UNIVERSITY OF LIMERICK; EMMA SMITH, UNIVERSITY OF TORONTO; BUUAN LAM, UNIVERSITY OF TORONTO; ETELVINO HENRIQUE NOVOTNY, CNPS; MICHAEL H. B. HAYES, UNIVERSITY OF LIMERICK. |
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Título: |
Unraveling the structural components of soil humin by use of solution-state nuclear magnetic resonance spectroscopy. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Environmental Science & Technology, v. 41, n. 3, p. 876-883, Feb. 2007. |
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DOI: |
https://doi.org/10.1021/es061576c |
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Idioma: |
Inglês |
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Conteúdo: |
Humin is the most recalcitrant and least understood fraction of soil organic matter. By definition, humin is that fraction not extracted by traditional aqueous alkaline soil extractants. Here we show that >_70% of the traditional humin fraction is solubilized when 0.1 M NaOH + 6 M urea and dimethyl sulfoxide (DMSO) + 6% H2SO4 are used in series after conventional extraction. Multidimensional solution-state NMR is applied in this study to gain an understanding of the major constituents present in these "solubilized humin fractions". The spectra indicated strong contributions from five main categories of components, namely. peptides, aliphatic species, carbohydrates, peptidoglycan, and lignin. Diffusion edited spectroscopy indicated that all species are present as macromolecules (or stable aggregate species). Although the distribution of the components is generally similar, peptidoglycan is present at significant levels supporting a higher microbial contribution to humin than to humic and fulvic fractions. The abundance of plant- and microbial-derived materials found does not exclude "humic" materials (e.g., oxidized lignin) or the presence of novel compounds at lower concentrations but suggests that a large proportion of humin is formed from classes of known compounds and parent biopolymers. |
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Palavras-Chave: |
Organic polymers. |
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Thesaurus NAL: |
Biopolymers; Carbohydrates; Peptides; Proteins; Soil. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02103naa a2200265 a 4500
001 1339170
005 2021-10-20
008 2007 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1021/es061576c$2DOI
100 1 $aSIMPSON, A. J.
245 $aUnraveling the structural components of soil humin by use of solution-state nuclear magnetic resonance spectroscopy.$h[electronic resource]
260 $c2007
520 $aHumin is the most recalcitrant and least understood fraction of soil organic matter. By definition, humin is that fraction not extracted by traditional aqueous alkaline soil extractants. Here we show that >_70% of the traditional humin fraction is solubilized when 0.1 M NaOH + 6 M urea and dimethyl sulfoxide (DMSO) + 6% H2SO4 are used in series after conventional extraction. Multidimensional solution-state NMR is applied in this study to gain an understanding of the major constituents present in these "solubilized humin fractions". The spectra indicated strong contributions from five main categories of components, namely. peptides, aliphatic species, carbohydrates, peptidoglycan, and lignin. Diffusion edited spectroscopy indicated that all species are present as macromolecules (or stable aggregate species). Although the distribution of the components is generally similar, peptidoglycan is present at significant levels supporting a higher microbial contribution to humin than to humic and fulvic fractions. The abundance of plant- and microbial-derived materials found does not exclude "humic" materials (e.g., oxidized lignin) or the presence of novel compounds at lower concentrations but suggests that a large proportion of humin is formed from classes of known compounds and parent biopolymers.
650 $aBiopolymers
650 $aCarbohydrates
650 $aPeptides
650 $aProteins
650 $aSoil
653 $aOrganic polymers
700 1 $aSONG, G.
700 1 $aSMITH, E.
700 1 $aLAM, B.
700 1 $aNOVOTNY, E. H.
700 1 $aHAYES, M. H. B.
773 $tEnvironmental Science & Technology$gv. 41, n. 3, p. 876-883, Feb. 2007.
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