A regulated auxin minimum is required for seed dispersal in Arabidopsis

Karim Sorefan, Thomas Girin, Sarah J. Liljegren, Karin Ljung, Pedro Robles, Carlos S. Galván-Ampudia, Remko Offringa, Jiří Friml, Martin F. Yanofsky and Lars Østergaard ()
Additional contact information
Karim Sorefan: John Innes Centre, Norwich Research Park, Colney Lane, Norwich, Norfolk NR4 7UH, UK
Thomas Girin: John Innes Centre, Norwich Research Park, Colney Lane, Norwich, Norfolk NR4 7UH, UK
Sarah J. Liljegren: Section of Cell and Developmental Biology, University of California at San Diego, La Jolla, California 92093-0116, USA
Karin Ljung: Umeå Plant Science Centre
Pedro Robles: Section of Cell and Developmental Biology, University of California at San Diego, La Jolla, California 92093-0116, USA
Carlos S. Galván-Ampudia: Institute of Biology, Leiden University, Wassenaarseweg 64, 2333 AL Leiden, The Netherlands
Remko Offringa: Institute of Biology, Leiden University, Wassenaarseweg 64, 2333 AL Leiden, The Netherlands
Jiří Friml: VIB, Ghent University
Martin F. Yanofsky: Section of Cell and Developmental Biology, University of California at San Diego, La Jolla, California 92093-0116, USA
Lars Østergaard: John Innes Centre, Norwich Research Park, Colney Lane, Norwich, Norfolk NR4 7UH, UK

Nature, 2009, vol. 459, issue 7246, 583-586

Abstract: Cell fate determined by hormonal minima The concept of local accumulation and concentration gradients of plant or animal hormones in organ development or tissue patterning is a familiar one. Now a study of the seed dispersal mechanism in Arabidopsis thaliana introduces a new concept: a regulated minimum level of a cell-signalling molecule as a determinant of cell fate. During seed dispersal A. thaliana fruits split open (or dehisce) along the valve margins. The transcription factor INDEHISCENT (IND) is known to be important for differentiation of valve margin cells. IND is now shown to produce an auxin minimum by controlling the expression of auxin efflux carriers, and it is the existence of this auxin minimum that specifies the valve margin separation layer than allows the fruit to open. The relative simplicity of forming and maintaining local hormone minima suggests that it might be more general method with which to seal the fate of small groups of cells.

Date: 2009
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DOI: 10.1038/nature07875

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