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Vol. 15, No. 1, pp. 79-89, January 1, 2001
1 Department of Cell Biology, John Innes Centre, Norwich,
NR4 7UH, UK; 2 INRA, Unité Santé
Végétale et Environnement, 06600 Antibes, France;
3 Botany Department, University College, Belfield, Dublin
4, Ireland
The cell wall is an important determinant of plant cell form. Here
we define a class of Arabidopsis root hair mutants with defective cell walls. Plants homozygous for kojak (kjk)
mutations initiate root hairs that rupture at their tip soon after
initiation. The KJK gene was isolated by positional cloning,
and its identity was confirmed by the molecular complementation of the
Kjk
phenotype and the sequence of three kjk
mutant alleles. KOJAK encodes a cellulose synthase-like
protein, AtCSLD3. KOJAK/AtCSLD3 is the first member of this subfamily
of proteins to be shown to have a function in cell growth. Subcellular
localization of the KOJAK/AtCSLD3 protein using a GFP fusion shows that
KOJAK/AtCSLD3 is located on the endoplasmic reticulum, indicating that
KOJAK/AtCSLD3 is required for the synthesis of a noncellulosic wall
polysaccharide. Consistent with the cell specific defect in the roots
of kjk mutants, KOJAK/AtCSDL3 is preferentially
expressed in hair cells of the epidermis. The Kjk
phenotype and the pattern of KOJAK/AtCSLD3 expression
suggest that this gene acts early in the process of root hair
outgrowth. These results suggest that KOJAK/AtCSLD3 is involved in the
biosynthesis of 
-glucan-containing polysaccharides that are
required during root hair elongation.
[Key Words:
Arabidopsis; cell wall; cellulose
synthase-like gene; -glucan; root hair; morphogenesis]
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