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The Relationship between myo ‐Inositol, ATP and Rotational Streaming
Author(s) -
Soran Viorel,
Lazăr Georgeta
Publication year - 1969
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.1399-3054.1969.tb07410.x
Subject(s) - inositol , stimulation , chemistry , uranyl , biophysics , biochemistry , biology , receptor , endocrinology , organic chemistry , ion
The rotational streaming of cytoplasm in barley root hairs has been stimulated about 1.3–1.8 times through continuous treatment with various solutions of myo ‐inositol. The stimulation attained the same level as after ATP administration and was dependent on the external myo ‐inositol supply with the employed concentrations. The stimulation was cut off by simultaneous treatment with myo ‐inositol and uranyl salts. By using uranyl acetate the rate of streaming was maintained about the value of the control. The uranyl chloride caused an inhibition in the rotational streaming and later made it to cease altogether. The simultaneous treatment with myo ‐inositol and 2.4‐DNP (dinitrophenol) induced a quick inhibition in 60% of the root hairs. consecutively stopping rotational streaming. It is assumed that the stimulation of rotational streaming is not due to the direct effect of myo ‐inositol but to ATP formed in the reaction: inositol hexaphosphate ++ ADP ↔ ATP + inositol. According to the results obtained by testing with uranyl salts, the phosphorylation of inositol probably takes place at the cell surface. The effect of 2,4‐nNP points to the presence of two competitive metabolic processes involved in ATP consumption: the upkeep of rotational streaming and the uptake of substances by the plant cell.