Plant Cell Journal of Pharmacology and Experimental Therapeutics
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First published online August 23, 2002; 10.1105/tpc.002873

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The Plant Cell, Vol. 14, 2001-2013, September 2002, Copyright © 2002,
American Society of Plant Biologists

KOBITO1 Encodes a Novel Plasma Membrane Protein Necessary for Normal Synthesis of Cellulose during Cell Expansion in Arabidopsis

Silvère Paganta, Adeline Bicheta, Keiko Sugimotob, Olivier Lerouxelc, Thierry Despreza, Maureen McCannb, Patrice Lerougec, Samantha Vernhettesa and Herman Höfte1,a

a Laboratoire de Biologie Cellulaire, Institut National de la Recherche Agronomique, Route de Saint-Cyr, 78026 Versailles Cedex, France
b Department of Cell and Developmental Biology, John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, United Kingdom
c Signaux et Régulations Chez les Végétaux 6037 Unité Mixte de Recherche Centre National de la Recherche Scientifique, IFRMP23, Université des Sciences, 76821 Mount St. Aignan, France

1 To whom correspondence should be addressed. E-mail hofte{at}versailles.inra.fr; fax 33-1-30-83-30-99

The cell wall is the major limiting factor for plant growth. Wall extension is thought to result from the loosening of its structure. However, it is not known how this is coordinated with wall synthesis. We have identified two novel allelic cellulose-deficient dwarf mutants, kobito1-1 and kobito1-2 (kob1-1 and kob1-2). The cellulose deficiency was confirmed by the direct observation of microfibrils in most recent wall layers of elongating root cells. In contrast to the wild type, which showed transversely oriented parallel microfibrils, kob1 microfibrils were randomized and occluded by a layer of pectic material. No such changes were observed in another dwarf mutant, pom1, suggesting that the cellulose defect in kob1 is not an indirect result of the reduced cell elongation. Interestingly, in the meristematic zone of kob1 roots, microfibrils appeared unaltered compared with the wild type, suggesting a role for KOB1 preferentially in rapidly elongating cells. KOB1 was cloned and encodes a novel, highly conserved, plant-specific protein that is plasma membrane bound, as shown with a green fluorescent protein–KOB1 fusion protein. KOB1 mRNA was present in all organs investigated, and its overexpression did not cause visible phenotypic changes. KOB1 may be part of the cellulose synthesis machinery in elongating cells, or it may play a role in the coordination between cell elongation and cellulose synthesis.




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