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Plant Physiology 47:87-90 (1971)
© 1971 American Society of Plant Biologists

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Articles

Cytokinin Activity in Water-stressed Shoots 1

Chanan Itai and Yoash Vaadia2

a Division of Life Sciences, Negev Institute for Arid Zone Research, Beer-Sheva, Israel

Water stress applied to the plant shoot through enhanced evaporative demands reduced cytokinin activity in extracts of xylem exudate and leaves. This reduction resembled the changes in cytokinin activity caused by water stress applied to the root. Cytokinin activity in detached wilting leaves decreased rapidly. Recovery took place after several hours in a humid chamber. Experiments with 14C-kinetin indicated that the mechanism of the inactivation and its reversal involve a chemical transformation of the cytokinin molecule.

2 Present address: Volcani Institute for Agricultural Research, Beit Dagan, Israel.

1 The research was supported by the United States Department of Agriculture under Contract FG-IS-32.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1971 by the American Society of Plant Biologists