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Journal of Experimental Botany, Vol. 52, No. 355, pp. 251-255, February 2001
© 2001 Oxford University Press

Original Papers

Fusicoccin- and IAA-induced elongation growth share the same pattern of K+ dependence

Katrin Tode and Hartwig Lüthen1

Institut für Allgemeine Botanik der Universität, Ohnhorststr. 18, D-22609 Hamburg, Germany

The dependence of growth induced by the fungal toxin fusicoccin (FC) on the K+ content of the incubation medium was investigated in abraded maize coleoptiles. If the divalent ion Ca2+ was included in the bathing medium, no FC-induced growth occurred in the absence of K+, whereas a strong response was detected in presence of K+. The optimal K+ concentration was in the range of 1–10 mM. With the exception of Rb+, none of the other alkali ions (Na+, Li+, Cs+) could replace for K+ in sustaining FC-induced growth. The potassium channel blocker tetraethylammonium (TEA) reversibly inhibited FC-induced growth. As shown earlier for auxin-induced growth, no strict potassium dependence of FC-triggered elongation was observed in Ca2+-free media. However, TEA abolished this apparently K+ independent FC-induced growth. It is concluded that FC-induced growth, like auxin-induced growth, requires K+ uptake through K+ channels.

Key words: Fusicoccin, auxin, channel blocker, potassium channel, elongation growth.


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