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Enhanced potassium uptake and phosphatidylinositol ‐phosphate turnover by hypertonic mannitol shock
Author(s) -
Srivastava Alaka,
Pines Mark,
Jacoby Benjamin
Publication year - 1989
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1989.tb05648.x
Subject(s) - mannitol , tonicity , phosphatidylinositol , potassium , chemistry , inositol , phosphate , biochemistry , biology , phosphorylation , receptor , organic chemistry
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)P 3 ) 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 (PIP 2 ) turnover cycle. Maximal Ins (1,4,5)P 3 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.