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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
20/04/1993 |
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Data da última atualização: |
17/08/2004 |
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Autoria: |
YAMADA, Y.; FUKUTOKU, Y. |
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Título: |
Behavior of free amino acids in water-stressed soybean plants. |
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Ano de publicação: |
1982 |
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Fonte/Imprenta: |
In: INTERNATIONAL PLANT NUTRITION COLLOQUIUM, 9., 1982, Warwick, England. Plant nutrition 1982: proceedings. Slough : CAB, 1982. . |
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Volume: |
v.2 |
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Páginas: |
p.734-745. |
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Idioma: |
Inglês |
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Conteúdo: |
Water stress was imposed upon soybean plants grown in a greenhouse by withholding irrigation for 10 days. With a decrease in the leaf water potential, the protein content gradually decreased, whereas the free ammonia content was relatively constant. Water stress induced an increased in the levels of free amino acids normally present in protein, suggesting that protein hydrolysis occurs under stress. Proline accumulated only under severe stress and attained 0.86% of the dry weight on day 10 (-2.6 MPa). Total proline (protein-bound + free) first decreased during mild to moderate stress, and then increased over that of the well-irrigated control plants at severe stress due to a remarkable accumulation of free proline. These findings indicate that some de novo synthesis of proline occurs under severe stress. After the labeling of nitogenous compounds in soybean plants with 15N by feeding with 15NO-3, water stress was imposed and the behavior of nitrogenous compounds and their 15N atom% were studied. From these results decreased absorption of nitrogen, inhibition of protein synthesis and increase of protein hydrolysis under water stress were strongly suggested. Nitrogen source of accumulated proline under stress was supposed to be protein. |
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Palavras-Chave: |
Estresse hidrico; Plant; Soybean. |
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Thesagro: |
Aminoácido; Planta; Soja. |
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Thesaurus Nal: |
amino acids; water stress. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01955naa a2200253 a 4500
001 1455463
005 2004-08-17
008 1982 bl uuuu u00u1 u #d
100 1 $aYAMADA, Y.
245 $aBehavior of free amino acids in water-stressed soybean plants.
260 $c1982
300 $ap.734-745. v.2
490 $vv.2
520 $aWater stress was imposed upon soybean plants grown in a greenhouse by withholding irrigation for 10 days. With a decrease in the leaf water potential, the protein content gradually decreased, whereas the free ammonia content was relatively constant. Water stress induced an increased in the levels of free amino acids normally present in protein, suggesting that protein hydrolysis occurs under stress. Proline accumulated only under severe stress and attained 0.86% of the dry weight on day 10 (-2.6 MPa). Total proline (protein-bound + free) first decreased during mild to moderate stress, and then increased over that of the well-irrigated control plants at severe stress due to a remarkable accumulation of free proline. These findings indicate that some de novo synthesis of proline occurs under severe stress. After the labeling of nitogenous compounds in soybean plants with 15N by feeding with 15NO-3, water stress was imposed and the behavior of nitrogenous compounds and their 15N atom% were studied. From these results decreased absorption of nitrogen, inhibition of protein synthesis and increase of protein hydrolysis under water stress were strongly suggested. Nitrogen source of accumulated proline under stress was supposed to be protein.
650 $aamino acids
650 $awater stress
650 $aAminoácido
650 $aPlanta
650 $aSoja
653 $aEstresse hidrico
653 $aPlant
653 $aSoybean
700 1 $aFUKUTOKU, Y.
773 $tIn: INTERNATIONAL PLANT NUTRITION COLLOQUIUM, 9., 1982, Warwick, England. Plant nutrition 1982: proceedings. Slough : CAB, 1982. .
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Registro original: |
Embrapa Soja (CNPSO) |
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