Abstract
The plant hormone auxin plays a role in virtually every aspect of plant growth and development. Temporal and spatial distribution of auxin largely depends on the dynamic expression and subcellular localization of the PIN auxin-efflux carrier proteins. We show here that the Arabidopsis thaliana JAGGED LATERAL ORGAN (JLO) gene, a member of the LATERAL ORGAN BOUNDARY DOMAIN (LBD) gene family, is required for coordinated cell division during embryogenesis. JLO promotes expression of several PINFORMED (PIN) genes during embryonic and root development. Inducible JLO misexpression reveals that JLO activity is sufficient for rapid and high level PIN1 and PIN3 transcription. Genes of the PLETHORA (PLT) family respond to auxin and direct PIN expression, but PLT genes were severely underexpressed in jlo mutants. JLO controls embryonic patterning together with the auxin dependent MONOPTEROS/BODENLOS pathway, but is itself only mildly auxin inducible. We further show that all known auxin responses in the root require JLO activity. We thereby identify JLO as a central regulator of auxin distribution and signaling throughout plant development.
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Acknowledgments
We are grateful to Carin Theres and Cornelia Gieseler for technical support and to members of the R.S. laboratory for critical comments. We specifically thank Jiri Friml, Frans Tax, Thomas Berleth, Gerd Jürgens, Dolf Weijers and Ben Scheres for generously supplying plant materials. This work was funded through an EU Marie Curie Research and Training Network “SyStem”, grant number MCRTN-CT-2004005336, and the DFG through grants Si677/2-1, 2-2 and Si947/3-1.
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Marina Bureau, Madlen I. Rast contributed equally to this work.
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Bureau, M., Rast, M.I., Illmer, J. et al. JAGGED LATERAL ORGAN (JLO) controls auxin dependent patterning during development of the Arabidopsis embryo and root. Plant Mol Biol 74, 479–491 (2010). https://doi.org/10.1007/s11103-010-9688-2
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DOI: https://doi.org/10.1007/s11103-010-9688-2