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PLANT PHYSIOLOGY , Vol 113, Issue 1 111-118, Copyright © 1997 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

Oscillations in H+ and Ca2+ Ion Fluxes around the Elongation Region of Corn Roots and Effects of External pH

S. N. Shabala, I. A. Newman and J. Morris
Department of Physics, University of Tasmania, G.P.O. Box 252 C, Hobart, Tasmania 7001, Australia

Net fluxes of H+ and Ca2+ around the elongation region of low-salt corn (Zea mays L.) roots were measured using the microelectrode ion flux estimation (MIFE) technique. At pH 5.2 two oscillatory components were found. Fast, 7-min oscillations in H+ flux were superimposed on slow oscillations of about 1.5 h. Fast oscillations in Ca2+ flux showed a strong dependence on the H+ oscillations and were normally leading in phase by about 1 to 1.5 min. Both oscillatory components were strongly affected by external pH values. Preincubation for 20 h in buffered pH 4.0 solution suppressed the slow oscillatory component and caused huge H+ influxes in the elongation region. The fast oscillations were 8 times larger in amplitude and were slightly lengthened. Preincubation at pH 6.0 did not suppress the rhythmic character of the ion fluxes but it shifted the average H+ flux to greater efflux. The fast and slow oscillatory components of H+ flux seem to relate to biophysical and biochemical mechanisms of intracellular pH homeostasis, respectively. The origin of the Ca2+ flux oscillations is discussed in terms of the "weak acid Donnan Manning" model of cell wall ion exchanges.


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Copyright © 1997 by the American Society of Plant Biologists