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PLANT PHYSIOLOGY , Vol 115, Issue 2 533-542, Copyright © 1997 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Anion-Channel Blockers Interfere with Auxin Responses in Dark-Grown Arabidopsis Hypocotyls
S. Thomine, F. Lelievre, M. Boufflet, J. Guern and H. Barbier-Brygoo
Institut des Sciences Vegetales, Centre National de la Recherche Scientifique, Bat. 22, Avenue de la Terrasse, F-91198 Gif-sur-Yvette cedex, France
Anion channels are thought to participate in signal transduction and turgor
regulation in higher plant cells. The regulation of hypocotyl cell
elongation is a situation in which these channels could play important
roles because it involves ionic fluxes that are implicated in turgor
control and orchestrated by various signals. We have used a pharmacological
approach to reveal the contribution of anion channels in the regulation of
the development of hypocotyls by auxins. Auxins induce an inhibition of
elongation, a disintegration of the cortical cell layers, and the formation
of adventitious roots on Arabidopsis thaliana hypocotyls grown in the dark.
Anion-channel blockers such as anthracene-9-carboxylic acid,
4,4[prime]-diisothiocyanatostilbene-2-2[prime]-disulfonic acid,
4-acetamido-4[prime]-isothiocyanato-stilbene-2-2[prime]-disulfonic acid,
and R(+)-methylindazone; indanyloxyacteic acid-94, which produce little or
no stimulation of hypocotyl elongation by themselves, are able to
counteract the inhibition and the disintegration induced by auxins with
various efficiencies. This interference appears to be specific for auxins
and does not occur when hypocotyl elongation is inhibited by other growth
regulators such as ethylene or cytokinins. The putative involvement of
anion channels in auxin signal transduction is discussed.
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