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JXB Advance Access published online on July 2, 2004
Journal of Experimental Botany, doi:10.1093/jxb/erh193
© 2004 by Oxford University Press
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Received January 14, 2004
Accepted May 5, 2004

RESEARCH PAPER

Lateral ABA transport in maize roots (Zea mays): visualization by immunolocalization

Daniela Schraut 1, Cornelia I. Ullrich 2, Wolfram Hartung 1*

1 Julius-von-Sachs-Institut für Biowissenschaften, Universität Würzburg, Julius-von-Sachs-Platz 2, 97082 Würzburg, Germany
2 Institut für Botanik, Technische Universität, Schnittspahnstr. 3, 64287 Darmstadt, Germany

* To whom correspondence should be addressed. E-mail: hartung{at}botanik.uni-wuerzburg.de.


  Abstract

The intensity of an ABA (abscisic acid) signal as a root-to-shoot signal, as well as its action on root hydraulic conductivity, strongly depends on the distribution of ABA during its radial transport across roots. Therefore ABA was visualized by immunolocalization with monoclonal ABA antibodies under conditions of lateral water flow induced by the application of a pressure gradient to the cut surface of the mesocotyl of maize seedlings. From the labelling of rhizodermis, hypodermis, cortical cells, and endodermis of roots of hydroponically (no exodermis) and aeroponically (with exodermis) grown seedlings it is concluded that the exodermis acts as a barrier to apoplastic transport that controls ABA uptake and efflux, but that the endodermis can easily be overcome via an apoplastic bypass. In longitudinal sections the strongest ABA signals originated from the root cap and the meristematic root tip, which is in agreement with the non-vacuolated cells of these tissues being an effective anion trap for ABA.

Keywords: ABA immunolocalization; exodermis; lateral ABA transport; maize root sections.
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