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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
Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, S-901 83, Umeå, Sweden.
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2002 (English)In: The Plant Cell, ISSN 1040-4651, E-ISSN 1532-298X, Vol. 14, no 3, p. 589-597Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2002. Vol. 14, no 3, p. 589-597
National Category
Developmental Biology Cell Biology Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:umu:diva-139913DOI: 10.1105/tpc.010354PubMedID: 11910006OAI: oai:DiVA.org:umu-139913DiVA, id: diva2:1144510
Available from: 2017-09-26 Created: 2017-09-26 Last updated: 2018-06-09Bibliographically approved
In thesis
1. Control of lateral root development in Arabidopsis thaliana
Open this publication in new window or tab >>Control of lateral root development in Arabidopsis thaliana
2001 (English)Licentiate thesis, comprehensive summary (Other academic)
Alternative title[en]
Lateral root development and auxin signalling in Arabidopsis thaliana
Place, publisher, year, edition, pages
Umeå: Sveriges Lantbruksuniversitet, 2001. p. 23
Series
Rapport / Sveriges lantbruksuniversitet, Institutionen för skoglig genetik och växtfysiologi, ISSN 0348-7954 ; 13
National Category
Cell Biology Developmental Biology
Research subject
Physiological Botany; Molecular Cellbiology
Identifiers
urn:nbn:se:umu:diva-135417 (URN)SLU-SKOGENV-R--13--SE (Local ID)SLU-SKOGENV-R--13--SE (Archive number)SLU-SKOGENV-R--13--SE (OAI)
Available from: 2017-09-26 Created: 2017-05-27 Last updated: 2018-06-09Bibliographically approved

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Eklöf, Jan

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