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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).

Record type: Article

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.

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More information

Submitted date: 14 August 2001
Published date: March 2002

Identifiers

Local EPrints ID: 45438
URI: http://eprints.soton.ac.uk/id/eprint/45438
ISSN: 1040-4651
PURE UUID: 3ef5c668-9410-4816-b937-06efd55a9154

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Date deposited: 03 Apr 2007
Last modified: 17 Jul 2017 15:12

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Contributors

Author: Alan Marchant
Author: Rishikesh Bhalerao
Author: Ilda Casimiro
Author: Jan Eklof
Author: Pedro J Casero
Author: Malcolm Bennett
Author: Goran Sandberg

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