Nickel and Cadmium-related Changes in Growth, Plasma Membrane Lipid Composition, ATPase Hydrolytic Activity and Proton-pumping of Rice (Oryza sativaL. cv. Bahia) Shoots

Effect of cadmium on growth, proton extrusion and membrane potential in maize coleoptile segments

“…The experiments in which IAA was added showed that Cd at concentrations higher than 10 μM inhibits proton pumping, which is responsible for IAA-induced growth. However, how Cd diminishes PM H + -ATPase activity is not entirely resolved, although it was suggested that Cd might decrease H + -ATPase activity by the alteration of the membrane fluidity and lipid composition (Ros et al 1992a, Fodor et al 1995, Hernández and Cooke 1997, Ouariti et al 1997 or by the binding of the metal to sulfhydryl groups of the enzyme (Stobart et al 1985, Van Assche and Clijsters 1990, Lagriffoul et al 1998.…”

Plant Plasma Membrane H+-ATPase in Adaptation of Plants to Abiotic Stresses

“…But in rice roots only 100 µM concentrations of Ni lead to stimulation of the enzyme protein (Ros et al, 1992a). The increase of ATPase activity in conditions of Ni and Cd metal stress was observed simultaneously with decrease in the degree of unsaturation and length of the phospholipid fatty acyl chain (Ros et al, 1992b). In contrast, Hernandez & Cook (1997) observed an increased degree of unsaturation of phospholipid-associated fatty acid in pea root plasma membrane as a result of 10-day cadmium treatment of plants.…”

Comparison of heavy metal effect on the proton pumps of plasma membrane and tonoplast in cucumber root cells

“…Phospholipids and sterols are potent regulatory factors modulating H + -ATPase activity in the PM. Two mechanisms for lipid modulation of membrane-bound enzyme have been postulated: first, by a direct binding of lipids to the enzyme protein and second, by an indirect lipid action via alteration of membrane fluidity and conformational enzyme changes (Ros et al, 1990(Ros et al, , 1992.…”