Abstract
Abstract Measurements were made on the fluxes of chloride and sulphate in excised maize roots as affected by ABA or kinetin at final concentrations 10−5 M. It was shown that addition of ABA stimulates the translocation of chloride and sulphate at 22 °C not only during the first hours of incubation, but also up to 24 hours. Kinetin on the contrary inhibits it, but mainly after the 6th hours. Moreover, ABA inhibits accumulation and efflux of chloride slowly, while kinetin has no effect on both. These data are interpreted as further support to the hypothesis that the principal action of ABA is the stimulation of ion release in xylem, while the principal action of kinetin is its inibition. The action of hormones appears similar either on chloride or sulphate ions, in spite of their different metabolic significance. These results may demonstrate that the effect of the hormons here considered is unspecific.
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