The auxin influx carrier LAX3 promotes lateral root emergence.
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.
Swarup
Kamal
K
School of Biosciences & Centre for Plant Integrative Biology, University of Nottingham, LE12 5RD, UK.
Benková
Eva
E
Swarup
Ranjan
R
Casimiro
Ilda
I
Péret
Benjamin
B
Yang
Yaodong
Y
Parry
Geraint
G
Nielsen
Erik
E
De Smet
Ive
I
Vanneste
Steffen
S
Levesque
Mitch P
MP
Carrier
David
D
James
Nicholas
N
Calvo
Vanessa
V
Ljung
Karin
K
Kramer
Eric
E
Roberts
Rebecca
R
Graham
Neil
N
Marillonnet
Sylvestre
S
Patel
Kanu
K
Jones
Jonathan D G
JD
Taylor
Christopher G
CG
Schachtman
Daniel P
DP
May
Sean
S
Sandberg
Goran
G
Benfey
Philip
P
Friml
Jiri
J
Kerr
Ian
I
Beeckman
Tom
T
Laplaze
Laurent
L
Bennett
Malcolm J
MJ
D017360:Arabidopsis; D029681:Arabidopsis Proteins / Q000502:physiology*; D002352:Carrier Proteins / Q000235:genetics / Q000502:physiology*; D018506:Gene Expression Regulation, Plant; D007210:Indoleacetic Acids / Q000494:pharmacology*; D026901:Membrane Transport Proteins / Q000502:physiology*; D010937:Plant Growth Regulators / Q000494:pharmacology; D018517:Plant Roots / Q000166:cytology / Q000254:growth & development*
D029681:Arabidopsis Proteins; D002352:Carrier Proteins; D007210:Indoleacetic Acids; C531125:LAX3 protein, Arabidopsis; D026901:Membrane Transport Proteins; D010937:Plant Growth Regulators