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Journal of Experimental Botany, Vol. 51, No. 346, pp. 929-935, May 2000
© 2000 Oxford University Press

Radial transport of abscisic acid conjugates in maize roots: its implication for long distance stress signals

Angela Sauter and Wolfram Hartung1

Julius von Sachs Institut für Biowissenschaften der Universität Würzburg, Lehrstuhl Botanik I, Julius von Sachs Platz 2, D-97082 Würzburg, Germany

Conjugated, alkaline hydrolysable ABA (predominantly abscisic acid glucose ester, ABA-GE), which is transported in the xylem from roots to shoots of Zea mays L. plants, has its origin in the root symplast rather than from soil, although it was detectable in soil solution with concentrations up to 30 nM. External ABA glucose ester cannot be dragged with the water flow across the exodermis and the endodermis because of its hydrophobic properties. Experimental evidence is presented that enzymes in the cortical apoplast cleave ABA-GE thus releasing ABA from its conjugates. Liberated ABA can then be translocated apoplastically and symplastically to the xylem vessels. Endogenous ABA-GE can be released from isolated cortical and stelar tissues to the surrounding media, with rates that are up to 5-fold higher from stelar tissues than those from cortical tissues. Release of ABA-GE is highest under conditions of inhibited ABA-metabolism.

Key words: ABA and ABA glucose ester, Zea mays L., roots, xylem sap, soil.


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