Journal Article

The <i>Arabidopsis</i> Root Hair Mutants <i>der2–der9</i> are Affected at Different Stages of Root Hair Development

Christoph Ringli, Nicolas Baumberger and Beat Keller

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 7, pages 1046-1053
Published in print July 2005 | ISSN: 0032-0781
Published online July 2005 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pci115
The Arabidopsis Root Hair Mutants der2–der9 are Affected at Different Stages of Root Hair Development

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  • Biochemistry
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Root hairs are an excellent model system to study cell developmental processes as they are easily accessible, single-celled, long tubular extensions of root epidermal cells. In a genetic approach to identify loci important for root hair development, we have isolated eight der (deformed root hairs) mutants from an ethylmethanesulfonate (EMS)-mutagenized Arabidopsis population. The der lines represent five new loci involved in root hair development and show a variety of abnormalities in root hair morphology, indicating that different root hair developmental stages are affected. A double mutant analysis with the short root hair actin2 mutant der1-2 confirmed that the der mutants are disturbed at different time points of root hair formation. Auxin and ethylene are known to be important for trichoblast cell fate determination and root hair elongation. Here, we show that they are able to suppress the phenotype of two der mutants. As the auxin- and ethylene-responsive der mutants are affected at different stages of root hair formation, our results demonstrate that the function of auxin and ethylene is not limited to cell differentiation and root hair elongation but that the two hormones are effective throughout the whole root hair developmental process.

Keywords: Auxin; der mutants; Ethylene; Root hairs; ACC, aminocyclopropane carboxylic acid; der, deformed root hair; EMS, ethylmethanesulfonate

Journal Article.  6484 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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