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JXB Advance Access originally published online on February 7, 2005
Journal of Experimental Botany 2005 56(413):879-886; doi:10.1093/jxb/eri080
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

RESEARCH PAPER

Radial transport of water and abscisic acid (ABA) in roots of Zea mays under conditions of nutrient deficiency

Daniela Schraut1, Hermann Heilmeier2 and Wolfram Hartung1,*

1Julius-von-Sachs-Institut für Biowissenschaften, Universität Würzburg, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany
2Interdiszipliäres Ökologisches Zentrum, TU Bergakademie, Freiberg, Leipziger Str. 29, D-09599 Freiberg, Germany

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

Radial water (JV) and abscisic acid (ABA) flows (JABA) through maize root seedlings have been investigated under different conditions of nutrient deficiency. Whereas JV was reduced under nitrogen deficiency, potassium deficiency stimulated JV. A substantial increase of JABA was observed in roots kept under potassium deficiency. The observed changes of JV might have resulted from changed barrier properties of the endodermis. Nitrogen and potassium deficiency also caused an accumulation of endogenous ABA in root tissues. Under all conditions studied, except under K+-deficiency, external ABA (100 nM) caused an increase of JV. The data of this study were used to analyse the relations between internal and endogenous root ABA, JV, and JABA. The internal ABA of root tissues was positively correlated with JV and was highly significant (P <0.001 for internal and P=0.03 for endogenous root ABA) within the range 2–300 pmol g–1 FW. It was also highly positively correlated to the radial ABA flows. There was also a highly positive correlation between JV and JABA. The data of this study indicate, for the first time, the relations between internal ABA, water, and ABA flows. Independent of treatment with external ABA, an ABA transport by solvent drag across the endodermis is confirmed.

Key words: Abscisic acid, nutrient deficiency, radial water transport


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