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- W2095030526 abstract "The control of ion concentration in the cytosol and the accumulation of ions in vacuoles are thought to be key factors in salt tolerance. These processes depend on the establishment in vacuolar membranes of an electrochemical H+ gradient generated by two distinct H+-translocating enzymes: a H+-PPase and a H+-ATPase. H+-lrans locating activities were characterized in tonoplast-enriched membrane fractions isolated by sucrose gradient centrifugation from sunflower (Helianthus annuus L.) roots exposed for 3 days to different NaCl regimes. The 15/32% sucrose interface was enriched in membrane vesicles possessing a vacuolar-type H+-ATPase and a H+-PPase, as indicated by inhibitor sensitivity, pH optimum, substrate specificity, ion effects kinetic data and immunolabelling with specific antibodies. Mild and severe stress did not alter the pH profile, ion dependence, apparent Km nor the amount of antigenic protein of either enzyme. Saline treatments slightly increased K+-stimulaied PPase activity with no change in ATPase activity, while both PPi-dependent and NO3-sensitive ATP-dependent H+ transport activities were strongly stimulated. These results are discussed in terms of an adaptative mechanism of the moderately tolerant sunflower plants to salt stress." @default.
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- W2095030526 date "1996-08-01" @default.
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- W2095030526 title "Effects of salt stress on H<sup>+</sup>- ATPase and H<sup>+</sup>-PPase activities of tonoplast-enriched vesicles isolated from sunflower roots" @default.
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- W2095030526 doi "https://doi.org/10.1034/j.1399-3054.1996.970208.x" @default.
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