Marchant, Alan, Bhalerao, Rishikesh, Casimiro, Ilda, Eklof, Jan, Casero, Pedro J, Bennett, Malcolm and Sandberg, Goran
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), . (doi:10.1105/tpc.010354).
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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
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
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
lateral root phenotype, implying that root
auxin levels are suboptimal for lateral root primordium initiation in the mutant.
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