Co-Authors:
Srivastava, A., Dept of Agric. Botany, Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot, 76100, Israel
Pines, M., Inst. of Animal Sci, Volcani Center, ARO, Beit Dagan, 50250, Israel
Jacoby, B., Dept of Agric. Botany, Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot, 76100, Israel
Abstract:
A hypertonic mannitol shock enhanced K+ uptake by Beta vulgaris L. (cv. early flat Egyptian) storage tissue slices and also increased the inositol 1,4,5‐trisphosphate [Ins(1,4,5)P3) content of the slices as well as of Sorghum bicolor L. (cv. Hazera) and Vigna radiata L. (cv. unknown) roots. K+ uptake by B. vulgaris slices could be enhanced, in the absence of mannitol, by application of effectors that mimic products of the phosphatidylinositol 4,5‐bisphosphate (PIP2) turnover cycle. Maximal Ins (1,4,5)P3 content was found 10 min after hypertonic induction and maximal K+ uptake was obtained 10 min later. The hypertonic mannitol shock, administered to intact B. vulgaris slices, also enhanced the phosphorylation of a 39 kDa protein in the plasmalemma. Copyright © 1989, Wiley Blackwell. All rights reserved
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