Plant Physiol. Drug Metab Dispos
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Plant Physiology 72:1094-1099 (1983)
© 1983 American Society of Plant Biologists

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Articles

Cavitation Events in Thuja occidentalis L.? 1

Utrasonic Acoustic Emissions from the Sapwood Can Be Measured

Melvin T. Tyree and Michael A. Dixon

Department of Botany, University of Toronto, Toronto, Canada M5S 1A1

Ultrasonic acoustic emissions (AE) in the frequency range of 0.1 to 1 megahertz appear to originate in the sapwood of Thuja occidentalis L. The AE are vibrations of an impulsive nature. The vibrations can be transduced to a voltage waveform and amplified. The vibrations of each AE event begin at a large amplitude which decays over 20 to 100 microseconds. Strong circumstantial evidence indicates that the ultrasonic AE result from cavitation events because: (a) they occur only when the xylem pressure potential {Psi}xp is more negative than a threshold level of about —1 megapascal; (b) the rate of AE events increases as {Psi}xp decreases and when the net rate of water loss increases; (c) the AE can be stopped by raising {Psi}xp above —1 megapascal. Ultrasonic AE have been measured in whole terminal shoots allowed to dry in the laboratory, in isolated pieces of sapwood as they dried in the laboratory, and in whole terminal shoots in a pressure bomb when {Psi}xp was decreased by lowering the gas pressure in the pressure bomb.

1 Supported by funds from the Natural Sciences and Engineering Research Council of Canada grant number A6919.




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Copyright © 1983 by the American Society of Plant Biologists