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First published online 10 January 2007
doi: 10.1242/dev.02753
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1 Department of Plant Systems Biology, Flanders Interuniversity Institute for
Biotechnology (VIB), Ghent University, Technologiepark 927, B-9052 Gent,
Belgium.
2 Plant Sciences Division, School of Biosciences, University of Nottingham,
Sutton Bonington Campus, Loughborough LE12 5RD, UK.
3 Unité Mixte de Recherche 1098, Institut de Recherche pour le
Développement, 911 Avenue Agropolis, F-34394 Montpellier cedex 5,
France.
4 Departamento de Ciencias Morfológicas y Biología Celular y
Animal, Universidad de Extremadura, Avenida de Elvas s/n, E-06071 Badajoz,
Spain.
Author for correspondence (e-mail:
tom.beeckman{at}psb.ugent.be)
Accepted 21 November 2006
In plants, the developmental mechanisms that regulate the positioning of lateral organs along the primary root are currently unknown. We present evidence on how lateral root initiation is controlled in a spatiotemporal manner in the model plant Arabidopsis thaliana. First, lateral roots are spaced along the main axis in a regular left-right alternating pattern that correlates with gravity-induced waving and depends on AUX1, an auxin influx carrier essential for gravitropic response. Second, we found evidence that the priming of pericycle cells for lateral root initiation might take place in the basal meristem, correlating with elevated auxin sensitivity in this part of the root. This local auxin responsiveness oscillates with peaks of expression at regular intervals of 15 hours. Each peak in the auxin-reporter maximum correlates with the formation of a consecutive lateral root. Third, auxin signaling in the basal meristem triggers pericycle cells for lateral root initiation prior to the action of INDOLE-3-ACETIC ACID14 (SOLITARY ROOT).
Key words: Arabidopsis, Auxin, Basal meristem, Lateral root, Root branching
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