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), pp. 589-597. (doi:10.1105/tpc.010354).

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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
Digital Object Identifier (DOI): doi:10.1105/tpc.010354
ISSNs: 1040-4651 (print)
Subjects:
ePrint ID: 45438
Date :
Date Event
14 August 2001Submitted
March 2002Published
Date Deposited: 03 Apr 2007
Last Modified: 16 Apr 2017 18:41
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/45438

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