AUX1 promotes lateral root formation by facilitating indole-3-acetic acid distribution between sink and source tissues in the arabidopsis seedling


Marchant, Alan, Bhalerao, Rishikesh, Casimiro, Ilda, Eklof, Jan, Casero, Pedro J, Bennett, Malcolm and Sandberg, Goran (2002) AUX1 promotes lateral root formation by facilitating indole-3-acetic acid distribution between sink and source tissues in the arabidopsis seedling. The Plant Cell, 14, (3), 589-597. (doi:10.1105/tpc.010354).

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Original Publication URL: http://dx.doi.org/10.1105/tpc.010354

Description/Abstract

Arabidopsis root architecture is regulated by shoot-derived signals such as nitrate and auxin. We report that mutations
in the putative auxin influx carrier AUX1 modify root architecture as a result of the disruption in hormone transport be-
tween indole-3-acetic acid (IAA) source and sink tissues. Gas chromatography–selected reaction monitoring–mass
spectrometry measurements revealed that the
aux1
mutant exhibited altered IAA distribution in young leaf and root tis-
sues, the major IAA source and sink organs, respectively, in the developing seedling. Expression studies using the
auxin-inducible reporter
IAA2
::
uidA
revealed that AUX1 facilitates IAA loading into the leaf vascular transport system.
AUX1 also facilitates IAA unloading in the primary root apex and developing lateral root primordium. Exogenous appli-
cation of the synthetic auxin 1-naphthylacetic acid is able to rescue the
aux1
lateral root phenotype, implying that root
auxin levels are suboptimal for lateral root primordium initiation in the mutant.

Item Type: Article
ISSNs: 1040-4651 (print)
Related URLs:
Subjects: S Agriculture > SB Plant culture
Q Science > QH Natural history > QH301 Biology
Divisions: University Structure - Pre August 2011 > School of Biological Sciences
ePrint ID: 45438
Date Deposited: 03 Apr 2007
Last Modified: 27 Mar 2014 18:29
Contact Email Address: goran.sandbeg@genfys.slu..se
URI: http://eprints.soton.ac.uk/id/eprint/45438

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