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Control of lateral root development in Arabidopsis thaliana
Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet, 901 83 Umeå.
2001 (English)Licentiate thesis, comprehensive summary (Other academic)Alternative title
Lateral root development and auxin signalling in Arabidopsis thaliana (English)
Place, publisher, year, edition, pages
Umeå: Sveriges Lantbruksuniversitet, 2001. , 23 p.
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: urn:nbn:se:umu:diva-135417Libris ID: 3317632Local ID: SLU-SKOGENV-R--13--SEOAI: oai:DiVA.org:umu-135417DiVA: diva2:1098883
Available from: 2017-09-26 Created: 2017-05-27 Last updated: 2017-09-26Bibliographically approved
List of papers
1. Shoot-derived auxin is essential for early lateral root emergence in Arabidopsis seedlings
Open this publication in new window or tab >>Shoot-derived auxin is essential for early lateral root emergence in Arabidopsis seedlings
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2002 (English)In: The Plant Journal, ISSN 0960-7412, E-ISSN 1365-313X, Vol. 29, no 3, 325-332 p.Article in journal (Refereed) Published
Abstract [en]

Lateral root formation is profoundly affected by auxins. Here we present data which indicate that light influences the formation of indole-3-acetic acid (IAA) in germinating Arabidopsis seedlings. IAA transported from the developing leaves to the root system is detectable as a short-lived pulse in the roots and is required for the emergence of the lateral root primordia (LRP) during early seedling development. LRP emergence is inhibited by the removal of apical tissues prior to detection of the IAA pulse in the root, but this treatment has minimal effects on LRP initiation. Our results identify the first developing true leaves as the most likely source for the IAA required for the first emergence of the LRP, as removal of cotyledons has only a minor effect on LRP emergence in contrast to removal of the leaves. A basipetal IAA concentration gradient with high levels of IAA in the root tip appears to control LRP initiation, in contrast to their emergence. A significant increase in the ability of the root system to synthesize IAA is observed 10 days after germination, and this in turn is reflected in the reduced dependence of the lateral root emergence on aerial tissue-derived auxin at this stage. We propose a model for lateral root formation during early seedling development that can be divided into two phases: (i) an LRP initiation phase dependent on a root tip-localized IAA source, and (ii) an LRP emergence phase dependent on leaf-derived IAA up to 10 days after germination.

Place, publisher, year, edition, pages
Blackwell Publishing, 2002
Keyword
auxin, IAA, lateral root, Arabidopsis thaliana
National Category
Developmental Biology Cell Biology
Identifiers
urn:nbn:se:umu:diva-139912 (URN)10.1046/j.0960-7412.2001.01217.x (DOI)11844109 (PubMedID)
Available from: 2017-09-26 Created: 2017-09-26 Last updated: 2017-09-26Bibliographically approved
2. AUX1 promotes lateral root formation by facilitating indole-3-acetic acid distribution between sink and source tissues in the Arabidopsis seedling
Open this publication in new window or tab >>AUX1 promotes lateral root formation by facilitating indole-3-acetic acid distribution between sink and source tissues in the Arabidopsis seedling
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2002 (English)In: The Plant Cell, ISSN 1040-4651, E-ISSN 1532-298X, Vol. 14, no 3, 589-597 p.Article 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.

National Category
Developmental Biology Cell Biology Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:umu:diva-139913 (URN)10.1105/tpc.010354 (DOI)11910006 (PubMedID)
Available from: 2017-09-26 Created: 2017-09-26 Last updated: 2017-09-26Bibliographically approved

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