AtPRP3

Wed, 27 Dec 2006 17:17:56 GMT

clipped by: arabido

Plant Physiol. 2000 March; 122(3): 705–714.

Expression of AtPRP3, a Proline-Rich Structural Cell Wall Protein from Arabidopsis, Is Regulated by Cell-Type-Specific Developmental Pathways Involved in Root Hair Formation¹

Christine Bernhardt and Mary L. Tierney^*

Department of Botany and Agricultural Biochemistry, University of Vermont, Burlington, Vermont 05405

^*Corresponding author; e-mail mtierney@zoo.uvm.edu; fax 802–656–0440.

Received August 24, 1999; Accepted November 29, 1999.

This article has been cited by other articles in PMC.

The tightly regulated expression patterns of structural cell wall proteins in several plant species indicate that they play a crucial role in determining the extracellular matrix structure for specific cell types. We demonstrate that AtPRP3, a proline-rich cell wall protein in Arabidopsis, is expressed in root-hair-bearing epidermal cells at the root/shoot junction and within the root differentiation zone of light-grown seedlings. Several lines of evidence support a direct relationship between AtPRP3 expression and root hair development. AtPRP3/β-glucuronidase (GUS) expression increased in roots of transgenic seedlings treated with either 1-aminocyclopropane-1-carboxylic acid (ACC) or α-naphthaleneacetic acid (α-NAA), compounds known to promote root hair formation. In the presence of 1-α-(2-aminoethoxyvinyl)glycine (AVG), an inhibitor of ethylene biosynthesis, AtPRP3/GUS expression was strongly reduced, but could be rescued by co-addition of ACC or α-NAA to the growth medium. In addition, AtPRP3/GUS activity was enhanced in ttg and gl2 mutant backgrounds that exhibit ectopic root hairs, but was reduced in rhd6 and 35S-R root-hair-less mutant seedlings. These results indicate that AtPRP3 is regulated by developmental pathways involved in root hair formation, and are consistent with AtPRP3's contributing to cell wall structure in Arabidopsis root hairs.

Tags: prp3, cell wall, arabidopsis, root hair, promoteur/gus

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AtPRP3