THE EFFECT OF KINETIN AND ABSCISIC ACID ON WATER AND ION TRANSPORT IN ISOLATED MAIZE ROOTS

Abstract

S ummary Exudation from the xylem of excised maize roots was studied in roots bathed in solutions containing kinetin or abscisic acid (ABA). Kinetin reduced the water permeability of the roots whilst ABA increased it. The action of both hormones was reversible and both were effective at concentrations of 10 ‐6 M and below. The possible in vivo role of these two hormones is discussed.