biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 43:407-411, 2000 | DOI: 10.1023/A:1026702729389

Effect of Osmotic Stress on Abscisic Acid Efflux and Compartmentation in the Roots of Two Maize Lines Differing in Drought Susceptibility

Lj. Jovanović1,*, R. Stikić2, W. Hartung3
1 Agricultural Research Institute "Serbia", Pesticides and Environmental Research Centre, Belgrade, Yugoslavia e-mail
2 Department of Agrochemistry and Plant Physiology, Faculty of Agriculture, University of Belgrade, Belgrade, Yugoslavia
3 Julius-von-Sachs-Institut für Biowissenschaften, Lehrstuhl für Botanik I, Würzburg, Germany

Roots of two Zea mays L. lines (drought-resistant Polj 17, and drought-susceptible F-2) were exposed to osmotic stress induced by sorbitol (osmotic potential -1.0 MPa). The following parameters were determined in cortex cells: membrane permeability for abscisic acid (ABA), ABA fluxes across membranes, pH values and ABA content in cytoplasm and vacuole. Osmotic stress induced different distribution of ABA within cell compartments in the investigated lines. ABA transport in the F-2 line occurred according to the intracellular pH gradient and the anion trap concept. In Polj 17, however, osmotic stress did not cause any significant effect on pH gradient and compartmental ABA content, but had a stimulating effect on ABA efflux from cytoplasm to apoplast and than via xylem to the leaf. These findings indicate different mechanisms of ABA transport between the investigated lines in response to osmotic stress.

Keywords: compartmental analysis; osmotic stress; root cortex cells; Zea mays L.
Subjects: abscisic acid, efflux, drought susceptibility; compartmental analysis, drought susceptibility; maize lines, drought susceptibility; osmotic stress, drought susceptibility; root cortex cells, drought susceptibility; Zea mays

Published: September 1, 2000  Show citation

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Jovanović, L., Stikić, R., & Hartung, W. (2000). Effect of Osmotic Stress on Abscisic Acid Efflux and Compartmentation in the Roots of Two Maize Lines Differing in Drought Susceptibility. Biologia plantarum, 43(3), 407-411. doi: 10.1023/A:1026702729389
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