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

Using root- and cell-pressure probes, the effects of the stress hormone abs cisic acid (ABA) on the water-transport properties of maize roots (Zea maps L.) were examined in order to work out dose and time responses for root hy draulic conductivity. Abscisic acid applied at concentrations of 100-1.000 nM increased the hydraulic conductivity of excised maize roots both at the organ (root Lp(r): 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 t he organ level. From the results it was concluded that ABA acts at the plas ma-lemma. presumably by an interaction with water channels. Abscisic acid t herefore facilitated the cell-to-cell component of transport of water acros s 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-transp iring conditions. when the apoplastic path of water transport is largely ex cluded.