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Planta

, Volume 211, Issue 6, pp 874–882 | Cite as

Abscisic acid and hydraulic conductivity of maize roots: a study using cell- and root-pressure probes

  • Elenor Hose
  • Ernst Steudle
  • Wolfram Hartung

Abstract.

Using root- and cell-pressure probes, the effects of the stress hormone abscisic acid (ABA) on the water-transport properties of maize roots (Zea mays L.) were examined in order to work out dose and time responses for root hydraulic conductivity. Abscisic acid applied at concentrations of 100–1,000 nM increased the hydraulic conductivity of excised maize roots both at the organ (root Lpr: factor of 3–4) and the root cell level (cell Lp: factor of 7–27). Effects on the root cortical cells were more pronounced than at the organ level. From the results it was concluded that ABA acts at the plasmalemma, presumably by an interaction with water channels. Abscisic acid therefore facilitated the cell-to-cell component of transport of water across the root cylinder. Effects on cell Lp were transient and highly specific for the undissociated (+)-cis-trans-ABA. The stress hormone ABA facilitates water uptake into roots as soils start drying, especially under non-transpiring conditions, when the apoplastic path of water transport is largely excluded.

Key words: Abscisic acid – Aquaporin – Hydraulic conductivity – Root – Water transport –Zea 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Elenor Hose
    • 1
  • Ernst Steudle
    • 2
  • Wolfram Hartung
    • 1
  1. 1.Julius-von-Sachs-Institut für Biowissenschaften der Universität Würzburg, Lehrstuhl Botanik I, Julius-von-Sachs-Platz 2, 97082 Würzburg, GermanyDE
  2. 2.Lehrstuhl für Pflanzenökologie der Universität Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, GermanyDE

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