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First published online 28 September 2005
doi: 10.1242/dev.02062
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1 Division of Biological Sciences, University of California San Diego, La Jolla,
CA 92093, USA
2 Plant Biology Laboratory, The Salk Institute for Biological Studies, La Jolla,
CA 92037, USA
3 Department of Molecular Biology, Max Planck Institute for Developmental
Biology, 72076 Tübingen, Germany
* Author for correspondence (e-mail: marty{at}biomail.ucsd.edu)
Accepted 25 August 2005
In the model plant Arabidopsis thaliana, the establishment of organ polarity leads to the expression of FILAMENTOUS FLOWER (FIL) and YABBY3 (YAB3) on one side of an organ. One important question that has remained unanswered is how does this positional information lead to the correct spatial activation of genes controlling tissue identity? We provide the first functional link between polarity establishment and the regulation of tissue identity by showing that FIL and YAB3 control the non-overlapping expression patterns of FRUITFULL (FUL) and SHATTERPROOF (SHP), genes necessary to form stripes of valve margin tissue that allow the fruit to shatter along two defined borders and disperse the seeds. FIL and YAB3 activate FUL and SHP redundantly with JAGGED (JAG), a gene that also promotes growth in organs, indicating that several pathways converge to regulate these genes. These activities are negatively regulated by REPLUMLESS (RPL), which divides FIL/JAG activity, creating two distinct stripes of valve margin.
Key words: Arabidopsis thaliana, Development, Fruit, Patterning, Polarity, Dehiscence
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