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Plant and Cell Physiology, 1978, Vol. 19, No. 2 345-348
© 1978

Short communication

Inhibition of ethylene production by osmotic shock. Further evidence for membrane control of ethylene production

Hidemasa Imaseki and Akira Watanabe

Research Institute for Biochemical Regulation, Faculty of Agriculture, Nagoya University, Chikusa Nagoya 464, Japan

Effects of osmotic shock applied to mung bean hypocotyl segments were examined to see if auxin-induced ethylene production is regulated by membrane activity. Uptake of {alpha}-aminoisobutyric acid was significantly inhibited by osmotic shock. While cold shock alone also inhibited the uptake, cold osmotic shock was most effective. Auxin-induced ethylene production by the osmotically shocked tissue was similarly inhibited. Shock treatment of auxin-pretreated tissue also suppressed the subsequent ethylene production. Oxygen uptake was not affected by the shock treatment. Sorbitol and sucrose used as osmotic substance were as effective as mannitol. The results suggest that ethylene production is controlled by membrane activity.

(Received July 18, 1977; )
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