Data/hora: 21/06/2024 03:23:49

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