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First published online September 28, 2005
doi: 10.1242/10.1242/dev.02027
niewska1,3
í Friml1,*
1 Centre for Molecular Biology of Plants, University Tübingen, Auf der
Morgenstelle 3, 72076 Tübingen, Germany
2 Department of Plant Systems Biology, Flanders Interuniversity Institute for
Biotechnology, Gent University, Technologiepark 927, B-9052 Gent,
Belgium
3 Department of Biotechnology, Institute of General and Molecular Biology,
87-100 Toru, Poland
4 Institute for Applied Genetics and Cell Biology, University of Applied Life
Sciences and Natural Resources, Muthgasse 18, A-1190 Vienna, Austria
* Author for correspondence (e-mail: jiri.friml{at}zmbp.uni-tuebingen.de)
Accepted 4 August 2005
Plant development displays an exceptional plasticity and adaptability that involves the dynamic, asymmetric distribution of the phytohormone auxin. Polar auxin flow, which requires polarly localized transport facilitators of the PIN family, largely contributes to the establishment and maintenance of the auxin gradients. Functionally overlapping action of PIN proteins mediates multiple developmental processes, including embryo formation, organ development and tropisms. Here we show that PIN proteins exhibit synergistic interactions, which involve cross-regulation of PIN gene expression in pin mutants or plants with inhibited auxin transport. Auxin itself positively feeds back on PIN gene expression in a tissue-specific manner through an AUX/IAA-dependent signalling pathway. This regulatory switch is indicative of a mechanism by which the loss of a specific PIN protein is compensated for by auxin-dependent ectopic expression of its homologues. The compensatory properties of the PIN-dependent transport network might enable the stabilization of auxin gradients and potentially contribute to the robustness of plant adaptive development.
Key words: Arabidopsis, Auxin transport, PINs, Functional redundancy
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