Data/hora: 01/06/2024 12:25:20

Biblioteca(s): | Embrapa Meio-Norte.
Data corrente: | 14/04/1997
Data da última atualização: | 02/09/2010
Autoria: | MELO, D. F. de; JOLIVET, Y.; FACANHA, A. R.; GOMES FILHO, E.
Título: | Effect of salt stress on mitochondrial energy metabolism of Vigna unguiculata cultivars differing in NaCl tolerance.
Ano de publicação: | 1994
Fonte/Imprenta: | Plant Physiology an Biochemistry, v. 32 n. 3, p. 405-412, 1994.
Idioma: | Inglês
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.
Palavras-Chave: | activity phosphorylation; ATPase; Bean; Caupi; Mitochondrial properties; NaCl treatmente.
Thesagro: | Mitocôndria; Vigna Unguiculata.
Categoria do assunto: | --
Registro original: | Embrapa Meio-Norte (CPAMN)
Exemplares: | CPAMN - (4053-1) - ADC - SP - -- - S 10644 -  - S 10644 - DIS