Plant Physiology Preview
Published on May 24, 2002; 10.1104/pp.004184
Received February 11, 2002
Accepted March 18, 2002
Cytokinesis-Defective Mutants of Arabidopsis
Rosi Söllner , Gerti Glässer , Gehard Wanner , Chris R. Somerville , Gerd Jürgens , and Farhah F. Assaad *
Genetics and Microbiology Institute, Ludwig Maximillian University, Maria Ward Strasse 1a, 80638 Munich, Germany (R.S., G.G., F.F.A.); Botany Institute, Ludwig Maximillian University, Menzingerstrasse 67, 80638 Munich, Germany (G.W.); Carnegie Institution, Department of Plant Biology, 260 Panama Street, Stanford, California 94305 (C.R.S.); and Lehrstuhl für Entwicklungsgenetik, Universität Tübingen, D--72076 Tübingen, Germany (G.J.)
* Corresponding author; email: fassaad{at}andrew2.stanford.edu.
We have identified mutations in six previously uncharacterized genes of Arabidopsis, named club, bublina, massue, rod, bloated, and bims, that are required for cytokinesis. The mutants are seedling lethal, have morphological abnormalities, and are characterized by cell wall stubs, gapped walls, and multinucleate cells. In these and other respects, the new mutants are phenotypically similar to knolle, keule, hinkel, and pleiade mutants. The mutants display a gradient of stomatal phenotypes, correlating roughly with the severity of their cytokinesis defect. Similarly, the extent to which the different mutant lines were capable of growing in tissue culture correlated well with the severity of the cytokinesis defect. Phenotypic analysis of the novel and previously characterized loci indicated that the secondary consequences of a primary defect in cytokinesis include anomalies in body organization, organ number, and cellular differentiation, as well as organ fusions and perturbations of the nuclear cycle. Two of the 10 loci are required for both cytokinesis and root hair morphogenesis. The results have implications for the identification of novel cytokinesis genes and highlight the mechanistic similarity between cytokinesis and root hair morphogenesis, two processes that result in a rapid deposition of new cell walls via polarized secretion.
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