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JXB Advance Access originally published online on July 2, 2004
Journal of Experimental Botany 2004 55(403):1635-1641; doi:10.1093/jxb/erh193
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Journal of Experimental Botany, Vol. 55, No. 403, © Society for Experimental Biology 2004; all rights reserved

RESEARCH PAPER

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

Daniela Schraut1, Cornelia I. Ullrich2 and Wolfram Hartung1,*

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

* To whom correspondence should be addressed. Fax: +49 931 888 6158. E-mail: hartung{at}botanik.uni-wuerzburg.de

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.

Key words: ABA immunolocalization, exodermis, lateral ABA transport, maize root sections


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