The auxin influx carrier LAX3 promotes lateral root emergence.

Kamal Swarup , Eva Benková (1) , Ranjan Swarup , Ilda Casimiro (2) , Benjamin Péret (3) , Yaodong Yang , Geraint Parry (4) , Erik Nielsen (5) , Ive de Smet (6) , Steffen Vanneste , Mitch P Levesque , David Carrier , Nicholas James , Vanessa Calvo , Karin Ljung (7) , Eric Kramer , Rebecca Roberts , Neil Graham , Sylvestre Marillonnet , Kanu Patel , Jonathan D G Jones , Christopher G Taylor , Daniel P Schachtman , Sean May , Goran Sandberg , Philip Benfey (8) , Jiri Friml (9) , Ian Kerr , Tom Beeckman (10) , Laurent Laplaze (11) , Malcolm J Bennett (3)

1 Flanders Institute for Biotechnology
2 UEX - Universidad de Extremadura - University of Extremadura
3 CPIB - Centre for Plant Integrative Biology [Nothingham]
4 Division of Biology [La Jolla]
5 Danish Road Institute
6 DPCS - Division of Plant and Crop Sciences
7 UPSC - Umea Plant Science Center
8 Department of Biology and Institute for Genome Science and Policy Center for Systems Biology
9 Department of Plant Biotechnology and Genetics [Ghent]
10 PSB Center - Center for Plant Systems Biology
11 UMR DIADE - Diversité, adaptation, développement des plantes

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.

Keywords: cultured tobacco cells; arabidopsis-thaliana; gene; initiation; organization

Keywords: transport; expression; mutations

Domains: Vegetal Biology

Kamal Swarup, Eva Benková, Ranjan Swarup, Ilda Casimiro, Benjamin Péret, et al.. The auxin influx carrier LAX3 promotes lateral root emergence.. Nature Cell Biology, 2008, 10 (8), pp.946-54. ⟨10.1038/ncb1754⟩. ⟨cea-00848585⟩