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Registro Completo |
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
14/04/1997 |
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Data da última atualização: |
02/09/2010 |
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Autoria: |
MELO, D. F. de; JOLIVET, Y.; FACANHA, A. R.; GOMES FILHO, E. |
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Título: |
Effect of salt stress on mitochondrial energy metabolism of Vigna unguiculata cultivars differing in NaCl tolerance. |
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Ano de publicação: |
1994 |
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Fonte/Imprenta: |
Plant Physiology an Biochemistry, v. 32 n. 3, p. 405-412, 1994. |
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Idioma: |
Inglês |
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Conteúdo: |
Mitochondria have been purified from hypocotyls of two cultivars of Vigna unguiculata (L.) Walp, known to be sensitive (Vita 5) and tolerant (Vita 3) to salinity. For Vita 5 mitochondria, 0.1 M NaCl treatment resulted in a lowering of the phosphorylative efficiency, while the mitochondrial ATPase activity was not modified. By contrast, stimulation of the ATPase activity in Vita 3 mitochondria under salt stress was in good agreement with the maintenance of the phosphorylative properties of the mitochondria. Under salt stress, the enzyme displays a lower affinity for the substrate (MgATP) and a higher Vmax. Consequently, under stress conditions, the two cultivars could be distinguished by the level of ATPase activity in the hypocotyl mitochondria. In the tolerant Vita 3 cultivar, the higher efficiency to phosphorylate could account for the better ability of this cultivar to sequestrate Na+ in the lower stem of the plant. |
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Palavras-Chave: |
activity phosphorylation; ATPase; Bean; Caupi; Mitochondrial properties; NaCl treatmente. |
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Thesagro: |
Mitocôndria; Vigna Unguiculata. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01670naa a2200253 a 4500
001 1052763
005 2010-09-02
008 1994 bl --- 0-- u #d
100 1 $aMELO, D. F. de
245 $aEffect of salt stress on mitochondrial energy metabolism of Vigna unguiculata cultivars differing in NaCl tolerance.
260 $c1994
520 $aMitochondria have been purified from hypocotyls of two cultivars of Vigna unguiculata (L.) Walp, known to be sensitive (Vita 5) and tolerant (Vita 3) to salinity. For Vita 5 mitochondria, 0.1 M NaCl treatment resulted in a lowering of the phosphorylative efficiency, while the mitochondrial ATPase activity was not modified. By contrast, stimulation of the ATPase activity in Vita 3 mitochondria under salt stress was in good agreement with the maintenance of the phosphorylative properties of the mitochondria. Under salt stress, the enzyme displays a lower affinity for the substrate (MgATP) and a higher Vmax. Consequently, under stress conditions, the two cultivars could be distinguished by the level of ATPase activity in the hypocotyl mitochondria. In the tolerant Vita 3 cultivar, the higher efficiency to phosphorylate could account for the better ability of this cultivar to sequestrate Na+ in the lower stem of the plant.
650 $aMitocôndria
650 $aVigna Unguiculata
653 $aactivity phosphorylation
653 $aATPase
653 $aBean
653 $aCaupi
653 $aMitochondrial properties
653 $aNaCl treatmente
700 1 $aJOLIVET, Y.
700 1 $aFACANHA, A. R.
700 1 $aGOMES FILHO, E.
773 $tPlant Physiology an Biochemistry$gv. 32 n. 3, p. 405-412, 1994.
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Registro original: |
Embrapa Meio-Norte (CPAMN) |
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