Article abstract

Nature Cell Biology 10, 946 - 954 (2008)
Published online: 11 July 2008 | doi:10.1038/ncb1754

The auxin influx carrier LAX3 promotes lateral root emergence

Kamal Swarup1,17, Eva Benková2,13,17, Ranjan Swarup1,17, Ilda Casimiro3,17, Benjamin Péret4,17, Yaodong Yang5, Geraint Parry1,14, Erik Nielsen5, Ive De Smet6,15, Steffen Vanneste6, Mitch P. Levesque7,16, David Carrier1,8, Nicholas James1, Vanessa Calvo3, Karin Ljung9, Eric Kramer10, Rebecca Roberts1, Neil Graham1, Sylvestre Marillonnet11, Kanu Patel11, Jonathan D.G. Jones11, Christopher G. Taylor5, Daniel P. Schachtman5, Sean May1, Goran Sandberg12, Philip Benfey7, Jiri Friml2,13, Ian Kerr8, Tom Beeckman6, Laurent Laplaze4 & Malcolm J. Bennett1

Lateral roots originate deep within the parental root from a small number of founder cells at the periphery of vascular tissues and must emerge through intervening layers of tissues. We describe how the hormone auxin, which originates from the developing lateral root, acts as a local inductive signal which re-programmes adjacent cells. Auxin induces the expression of a previously uncharacterized auxin influx carrier LAX3 in cortical and epidermal cells directly overlaying new primordia. Increased LAX3 activity reinforces the auxin-dependent induction of a selection of cell-wall-remodelling enzymes, which are likely to promote cell separation in advance of developing lateral root primordia.

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  1. School of Biosciences & Centre for Plant Integrative Biology, University of Nottingham, LE12 5RD, UK.
  2. ZMBP, University of Tubingen, Auf der Morgenstelle 3, Germany.
  3. Universidad de Extremadura, Facultad de Ciencias, Badajoz, Spain.
  4. IRD, UMR DiA-PC (Agro.M/INRA/IRD/UM2), équipe rhizogenèse, 911 avenue Agropolis 34394 Montpellier Cedex 5, France.
  5. Donald Danforth Plant Science Center, 975 North Warson Road, St. Louis, MO 63122, USA.
  6. Department of Plant Systems Biology, VIB, Ghent University, B-9052 Gent, Belgium.
  7. Department of Biology & Institute for Genome Sciences & Policy, Duke University, Durham, North Carolina, USA.
  8. School of Biomedical Sciences, University of Nottingham, NG7 2UH, UK.
  9. Umea Plant Science Centre, Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, SLU, SE-901 83 Umeå, Sweden.
  10. Physics Department, Simon's Rock College, Great Barrington, MA 01201, USA.
  11. Sainsbury Laboratory, John Innes Centre, Norwich, UK.
  12. Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-901 87 Umeå, Sweden.
  13. Current address: Department of Plant Systems Biology, VIB, Ghent University, B-9052 Gent, Belgium.
  14. Department of Biology, University of Indiana, Bloomington, USA.
  15. ZMBP - Entwicklungsgenetik, Universität Tübingen, Germany.
  16. Max Planck Institute for Developmental Biology, Tübingen, Germany.
  17. These authors contributed equally to this work

Correspondence to: Malcolm J. Bennett1 e-mail: malcolm.bennett@nottingham.ac.uk



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