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Polar flow of the phytohormone auxin requires plasma membrane-associatedPIN proteins and underlies multiple developmental processesin plants. Here we address the importance of the polarity ofsubcellular PIN localization for the directionality of auxintransport in Arabidopsis thaliana. Expression of different PINsin the root epidermis revealed the importance of PIN polar positionsfor directional auxin flow and root gravitropic growth. Interferingwith sequence-embedded polarity signals directly demonstratesthat PIN polarity is a primary factor in determining the directionof auxin flow in meristematic tissues. This finding providesa crucial piece in the puzzle of how auxin flow can be redirectedvia rapid changes in PIN polarity.
1 Center for Plant Molecular Biology (ZMBP), Tübingen University, D-72076 Tübingen, Germany. 2 Department of Molecular Genetics, Utrecht University, 3584CH Utrecht, Netherlands. 3 Department of Biotechnology, Institute of General and Molecular Biology, 87-100 Toru, Poland.
* Present address: Bayer CropScience, F-06560 Sophia AntipolisCedex, France.
To whom correspondence should be addressed. E-mail: jiri.friml{at}zmbp.uni-tuebingen.de
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