The Measurement of Diffusion Pressure Deficit in Plants by a Method of Vapour Equilibration

Abstract

A method for measuring diffusion pressure deficit (DPD) in plants is described and compared with the standard floating techniques. Basically the method is a modification of that described by Arcichovskij and Arcichovskaja (1931) and differs from the standard floating methods in that it involves the equilibration of tissue in vapour of known water potential rather than in solutions of known osmotic potential.