Influence of Fusicoccin on the Control of Cell Division by Auxins

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Abstract
An indirect stimulation of cell division by fusicoccin is demonstrated. The distribution of 2,4-D molecules between Acer pseudoplatanus cells and their culture medium is strongly modified by a fusicoccin treatment, through the extracellular acidification induced by the toxin. As a consequence, a stimulation of cell division is observed when the intracellular auxin concentration is sufficiently increased to reach the threshold control level (Leguay, J.J. and J. Guern). Independently of this indirect action on cell division, the number of cells per cluster is decreased and the volume of the cells increased in fusicoccin-treated cells which show a typical enlargement response.