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Reduction of Hydraulic Conductivity during Inhibition of Exudation from Excised Maize and Barley Roots ^1,2

School of Biological Sciences, University of Sydney, N.S.W. 2006, Australia

The uncoupler, carbonyl cyanide m-chlorophenyl hydrazone (CCCP) is shown to reduce the hydraulic conductivity of barley, maize, mung bean, and onion roots. In barley and maize, the reduction in exudation from excised roots is partly due to the reduction in the permeability of the root to water (I_p), but it can be inferred that the rate of salt release to the xylem, is also inhibited. The action of CCCP on L_p is suggested to be mainly in blocking the symplasmic pathway at the plasmodesmata.

² This paper is dedicated to the memory of Noe Higinbotham in appreciation of his contribution to studies of ion transport and his personal assistance and stimulation to his colleagues in Australia.

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