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First published online July 24, 2009; 10.1104/pp.109.140111

Plant Physiology 151:155-167 (2009)
© 2009 American Society of Plant Biologists

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CELL BIOLOGY AND SIGNAL TRANSDUCTION

Auxin Stimulates Its Own Transport by Shaping Actin Filaments1

Peter Nick*, Min-Jung Han and Gyeunhung An

Institute of Botany 1, University of Karlsruhe, D–76128 Karlsruhe, Germany (P.N.); and National Research Laboratory of Plant Functional Genomics, Department of Life Science, Pohang University of Science and Technology (POSTECH), Pohang 790–784, Republic of Korea (M.-J.H., G.A.)

The directional transport of the plant hormone auxin has been identified as central element of axis formation and patterning in plants. This directionality of transport depends on gradients, across the cell, of auxin-efflux carriers that continuously cycle between plasma membrane and intracellular compartments. This cycling has been proposed to depend on actin filaments. However, the role of actin for the polarity of auxin transport has been disputed. The organization of actin, in turn, has been shown to be under control of auxin. By overexpression of the actin-binding protein talin, we have generated transgenic rice (Oryza sativa) lines, where actin filaments are bundled to variable extent and, in consequence, display a reduced dynamics. We show that this bundling of actin filaments correlates with impaired gravitropism and reduced longitudinal transport of auxin. We can restore a normal actin configuration by addition of exogenous auxins and restore gravitropism as well as polar auxin transport. This rescue is mediated by indole-3-acetic acid and 1-naphthyl acetic acid but not by 2,4-dichlorophenoxyacetic acid. We interpret these findings in the context of a self-referring regulatory circuit between polar auxin transport and actin organization. This circuit might contribute to the self-amplification of auxin transport that is a central element in current models of auxin-dependent patterning.

1 This work was in part supported by a grant from the Biogreen 21 program, Rural Development Administration (to G.A.), and the German Research Council (Priority Programme Phytohormones; P.N.).

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Peter Nick (peter.nick{at}bio.uni-karlsruhe.de).

www.plantphysiol.org/cgi/doi/10.1104/pp.109.140111

* Corresponding author; e-mail peter.nick{at}bio.uni-karlsruhe.de.

Received April 22, 2009; accepted July 17, 2009; published July 24, 2009.


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