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First published online March 8, 2002; 10.1105/tpc.010354

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The Plant Cell, Vol. 14, 589-597, March 2002, Copyright © 2002,
American Society of Plant Biologists

AUX1 Promotes Lateral Root Formation by Facilitating Indole-3-Acetic Acid Distribution between Sink and Source Tissues in the Arabidopsis Seedling

Alan Marchant1,a, Rishikesh Bhalerao1,b, Ilda Casimiroc, Jan Eklöfb, Pedro J. Caseroc, Malcolm Bennetta and Goran Sandberg2,b

a Plant Science Division, School of Biosciences, University of Nottingham, Nottingham NG7 2RD, United Kingdom
b Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, S-901 83, Umea, Sweden
c Departmento de Ciencias Morfologicas y Biologia Celular y Animal, University of Extremadura, Badajoz, Spain

2 To whom correspondence should be addressed. E-mail goran.sandberg{at}genfys.slu.se; fax 46-90-786-5901

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 between 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 tissues, 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 application 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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