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- W2048408422 abstract "The effects of ionizing radiation, used in post-harvest treatment of fruit and vegetables. were investigated on cultured apple cells (Pyrus malus L. cv. Royal Red) on a short-term period. Irradiation (2 kGy) induced an increase of passive ion effluxes from cells and a decrease of cell capacity to regulate external pH. These alterations are likely due to effects on plasma membrane structure and function and were further investigated by studying the effects of irradiation on plasma membrane H+-ATPase activity. Plasma membrane-enriched vesicles were prepared and the H+-ATPase activity was characterized. Irradiation of the vesicles induced a dose dependent inhibition of H+-ATPase activity. The loss of enzyme activity was immediate, even at low doses (0.5 kGy), and was not reversed by the addition of 2mM dithiothreitol. This inhibition may be the result of an irreversible oxidation of enzyme sulfhydryl moieties and/or the result of changes induced within the lipid bilayer affecting the membrane-enzyme interactions. Further analysis of the H+-ATPase activity was carried out on vesicles obtained from irradiated cells confirming the previous results. In vivo recovery of activity was not observed within 5 h following the treatment, thus explaining the decrease of cell capacity to regulate external pH. This rapid irreversible inhibition of the plasma membrane H+-ATPase must be considered as one of the most important primary biochemical events occurring in irradiated plant material." @default.
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- W2048408422 date "1994-02-01" @default.
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- W2048408422 title "Effects of gamma irradiation on the plasma membrane of suspension-cultured apple cells. Rapid irreversible inhibition of H+-ATPase activity" @default.
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