|
Registro Completo |
|
Biblioteca(s): |
Embrapa Soja. |
|
Data corrente: |
07/04/1993 |
|
Data da última atualização: |
18/08/2004 |
|
Autoria: |
SHEARMAN, L. L.; KLUCAS, R. V. |
|
Título: |
Profiles of ureides and amino acids in exudates from senescing soybean nodules. |
|
Ano de publicação: |
1982 |
|
Fonte/Imprenta: |
In: GRAHAM, P.H.; HARRIS, S.C., ed. Biological nitrogen fixation technology for tropical agriculture. Cali: CIAT, 1982. |
|
Páginas: |
p.327-336. |
|
Idioma: |
Inglês |
|
Notas: |
Based on papers presented at a workshop held at the Centro Internacional de Agricultura Tropical March 9-13, 1981, Cali Colombia. |
|
Conteúdo: |
The concentration of ureides (allantoin, allantoic acid, and urea), amino acids, and total nitrogen (N) in nodule exudates were monitored over the production cycle of field- and glasshouse- grown soybeans, and related to levels of N2 (C2H2) fixation in these plants. In both glasshouse and field studies, specific N2-fixing activity peaked at mid-flowering and initiation of pod fill, with a slight secondary peak at the full seed stage. As N2 fixation per nodule correlated with nodule fresh and dry weight (r = 0.70), two populations of nodules are suggested. Nodule exudates from greenhouse-grown plants had higher amino acid concentrations than field-grown plants. Asparagine was the major amino acid and reached a concentration of 1.6 mM during reproductive development. Asparagine, glutamine, serine, alanine and aspartate were found in all samples; glycine, isoleucine, threonine, valine, and proline appeared in only some samples. Ureides accounted for most of the N exported from nodules, but the ureide: amino acid ratio declined during peak fixation. Nodule exudates from field-grown plants contained a high proportion of ureides-mostly as urea, but again the proportion of amino acid N tended to increase during peak fixation. Although changes were observed in the various N fractions during the study, they were not consistend for both greenhouse and field-grown plants could not be related to nodule senescence. |
|
Palavras-Chave: |
Aminoacidos; Fixacao; Fixation; Soybean; Ureideos. |
|
Thesagro: |
Fisiologia; Nitrogênio; Soja. |
|
Thesaurus Nal: |
amino acids; nitrogen; physiology; ureides. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02358naa a2200301 a 4500
001 1454721
005 2004-08-18
008 1982 bl uuuu u00u1 u #d
100 1 $aSHEARMAN, L. L.
245 $aProfiles of ureides and amino acids in exudates from senescing soybean nodules.
260 $c1982
300 $ap.327-336.
500 $aBased on papers presented at a workshop held at the Centro Internacional de Agricultura Tropical March 9-13, 1981, Cali Colombia.
520 $aThe concentration of ureides (allantoin, allantoic acid, and urea), amino acids, and total nitrogen (N) in nodule exudates were monitored over the production cycle of field- and glasshouse- grown soybeans, and related to levels of N2 (C2H2) fixation in these plants. In both glasshouse and field studies, specific N2-fixing activity peaked at mid-flowering and initiation of pod fill, with a slight secondary peak at the full seed stage. As N2 fixation per nodule correlated with nodule fresh and dry weight (r = 0.70), two populations of nodules are suggested. Nodule exudates from greenhouse-grown plants had higher amino acid concentrations than field-grown plants. Asparagine was the major amino acid and reached a concentration of 1.6 mM during reproductive development. Asparagine, glutamine, serine, alanine and aspartate were found in all samples; glycine, isoleucine, threonine, valine, and proline appeared in only some samples. Ureides accounted for most of the N exported from nodules, but the ureide: amino acid ratio declined during peak fixation. Nodule exudates from field-grown plants contained a high proportion of ureides-mostly as urea, but again the proportion of amino acid N tended to increase during peak fixation. Although changes were observed in the various N fractions during the study, they were not consistend for both greenhouse and field-grown plants could not be related to nodule senescence.
650 $aamino acids
650 $anitrogen
650 $aphysiology
650 $aureides
650 $aFisiologia
650 $aNitrogênio
650 $aSoja
653 $aAminoacidos
653 $aFixacao
653 $aFixation
653 $aSoybean
653 $aUreideos
700 1 $aKLUCAS, R. V.
773 $tIn: GRAHAM, P.H.; HARRIS, S.C., ed. Biological nitrogen fixation technology for tropical agriculture. Cali: CIAT, 1982.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Soja (CNPSO) |
|
