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Shoot-derived auxin is essential for early lateral root emergence in Arabidopsis seedlings
Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden.
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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. Vol. 29, no 3, 325-332 p.
Keyword [en]
auxin, IAA, lateral root, Arabidopsis thaliana
National Category
Developmental Biology Cell Biology
Identifiers
URN: urn:nbn:se:umu:diva-139912DOI: 10.1046/j.0960-7412.2001.01217.xPubMedID: 11844109OAI: oai:DiVA.org:umu-139912DiVA: diva2:1144514
Available from: 2017-09-26 Created: 2017-09-26 Last updated: 2017-09-26Bibliographically 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. 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: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: 2017-09-26Bibliographically approved

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