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

Titelangaben

Hose, Elenor ; Steudle, Ernst ; Hartung, Wolfram:
Abscisic acid and hydraulic conductivity of maize roots: a study using cell- and root-pressure probes.
In: Planta. Bd. 211 (2000) Heft 6 . - S. 874-882.
ISSN 0032-0935
DOI: https://doi.org/10.1007/s004250000412

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 maps 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 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 the organ level. From the results it was concluded that ABA acts at the plasma-lemma. 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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER33619
Institutionen der Universität: Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzenökologie
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 24 Sep 2015 09:38
Letzte Änderung: 24 Sep 2015 09:38
URI: https://eref.uni-bayreuth.de/id/eprint/19656