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PMID:11331608

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Citation

Baumberger, N, Ringli, C and Keller, B (2001) The chimeric leucine-rich repeat/extensin cell wall protein LRX1 is required for root hair morphogenesis in Arabidopsis thaliana. Genes Dev. 15:1128-39

Abstract

In plants, the cell wall is a major determinant of cell morphogenesis. Cell enlargement depends on the tightly regulated expansion of the wall, which surrounds each cell. However, the qualitative and quantitative mechanisms controlling cell wall enlargement are still poorly understood. Here, we report the molecular and functional characterization of LRX1, a new Arabidopsis gene that encodes a chimeric leucine-rich repeat/extensin protein. LRX1 is expressed in root hair cells and the protein is specifically localized in the wall of the hair proper, where it becomes insolubilized during development. lrx1-null mutants, isolated by a reverse-genetic approach, develop root hairs that frequently abort, swell, or branch. Complementation and overexpression experiments using modified LRX1 proteins indicate that the interaction with the cell wall is important for LRX1 function. These results suggest that LRX1 is an extracellular component of a mechanism regulating root hair morphogenesis and elongation by controlling either polarized growth or cell wall formation and assembly.

Links

PubMed PMC312681 Online version:10.1101/gad.200201

Keywords

Amino Acid Motifs; Amino Acid Sequence; Arabidopsis/cytology; Arabidopsis/physiology; Arabidopsis Proteins; Cell Differentiation; Cell Wall/metabolism; Cloning, Molecular; DNA Transposable Elements; Gene Expression Regulation, Plant; Molecular Sequence Data; Mutation; Plant Proteins/genetics; Plant Proteins/metabolism; Plant Roots/cytology; Plant Roots/physiology

Significance

Annotations

Gene product Qualifier GO ID GO term name Evidence Code with/from Aspect Notes Status


See also

References

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