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Plant Physiol, June 2001, Vol. 126, pp. 575-586
AtCSLD3, A Cellulose Synthase-Like Gene Important for
Root Hair Growth in Arabidopsis1
Xuan
Wang,2
Gerda
Cnops,2
Rudy
Vanderhaeghen,
Sabine
De Block,
Marc
Van Montagu, and
Mieke
Van
Lijsebettens*
Vakgroep Moleculaire Genetica & Departement Plantengenetica, Vlaams
Interuniversitair Instituut voor Biotechnologie, Universiteit Gent,
K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
A member of the cellulose synthase-like (subfamily D) gene family
of Arabidopsis, AtCSLD3, has been identified by T-DNA
tagging. The analysis of the corresponding mutant,
csld3-1, showed that the AtCSLD3 gene
plays a role in root hair growth in plants. Root hairs grow in phases:
First a bulge is formed and then the root hair elongates by polarized
growth, the so-called "tip growth." In the mutant, root hairs were
initiated at the correct position and grew into a bulge, but their
elongation was severely reduced. The tips of the csld3-1
root hairs easily leaked cytoplasm, indicating that the tensile
strength of the cell wall had changed at the site of the tip. Based on
the mutant phenotype and the functional conservation between CSLD3 and
the genuine cellulose synthase proteins, we hypothesized that the CSLD3
protein is essential for the synthesis of polymers for the fast-growing
primary cell wall at the root hair tip. The distinct mutant phenotype
and the ubiquitous expression pattern indicate that the CSLD3 gene
product is only limiting at the zone of the root hair tip, suggesting particular physical properties of the cell wall at this specific site
of the root hair cell.
1
This work was supported by a grant from the Fund
for Scientific Research, Flanders (grant no.
G.0075.97).
2
These authors contributed equally to this work.
*
Corresponding author; e-mail milij{at}gengenp.rug.ac.be; fax
32-9-2645349.
© 2001 American Society of Plant Physiologists
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