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Science 306 (5697): 862-865

Copyright © 2004 by the American Association for the Advancement of Science

A PINOID-Dependent Binary Switch in Apical-Basal PIN Polar Targeting Directs Auxin Efflux

Jirí Friml,1 Xiong Yang,2,3 Marta Michniewicz,1 Dolf Weijers,1,2 Ab Quint,2 Olaf Tietz,4 René Benjamins,2,6 Pieter B. F. Ouwerkerk,2 Karin Ljung,5 Göran Sandberg,5 Paul J. J. Hooykaas,2 Klaus Palme,4 Remko Offringa2*

Abstract: Polar transport–dependent local accumulation of auxin provides positional cues for multiple plant patterning processes. This directional auxin flow depends on the polar subcellular localization of the PIN auxin efflux regulators. Overexpression of the PINOID protein kinase induces a basal-to-apical shift in PIN localization, resulting in the loss of auxin gradients and strong defects in embryo and seedling roots. Conversely, pid loss of function induces an apical-to-basal shift in PIN1 polar targeting at the inflorescence apex, accompanied by defective organogenesis. Our results show that a PINOID-dependent binary switch controls PIN polarity and mediates changes in auxin flow to create local gradients for patterning processes.

1 Developmental Genetics, Center for Molecular Biology of Plants, University Tübingen, Auf der Morgenstelle 3, D-72076 Tübingen, Germany.
2 Developmental Genetics, Institute of Biology, Leiden University, Clusius Laboratory, Wassenaarseweg 64, 2333 AL Leiden, Netherlands.
3 College of Life Sciences, Peking University, Beijing 100871, China.
4 Albert-Ludwigs-Universität, Biologie II, Schaenzlestrasse 1, D-79104 Freiburg, Germany.
5 Umeå Plant Science Center, Department of Forest and Plant Physiology, Swedish University of Agricultural Sciences, S 901 83 Umeå, Sweden.
6 Institute of Applied Genetics and Cell Biology, BOKU–University of Natural Resources and Applied Life Sciences, Muthgasse 8, A-1190 Vienna, Austria.

* To whom correspondence should be addressed. E-mail: offringa{at}rulbim.leidenuniv.nl


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