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Plant and Cell Physiology Advance Access published online on March 7, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci068
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received January 3, 2005
Accepted February 4, 2005

Short Communication

Aberrant Cell Plate Formation in the Arabidopsis thaliana Microtubule Organization 1 Mutant

Eleftherios P. Eleftheriou 1, Tobias I. Baskin 2*, and Peter K. Hepler 2

1 Biology Department, University of Massachusetts, Amherst, MA, 01003 USA; Botany Department, School of Biology, Aristotle University of Thessaloniki, 542 50 Thessaloniki, Greece
2 Biology Department, University of Massachusetts, Amherst, MA, 01003 USA

* To whom correspondence should be addressed.
Tobias I. Baskin, E-mail: baskin{at}bio.umass.edu


  Abstract

MICTROUBULE ORGANIZATION 1 encodes a microtubule-associated protein in Arabidopsis thaliana but different alleles have contradictory phenotypes. The original mutant mor1 alleles were reported to have disrupted cortical microtubules, swollen organs, and normal cytokinesis, whereas other alleles, embryo-lethal gemini pollen 1 (gem1), have defective pollen cytokinesis. To determine whether MOR1 functions generally in cytokinesis, we examined the ultrastructure of cell division in roots of the original mor1-1 allele. Cell plates are misaligned, branched, and meandering; the forming cell plates remain partly vesicular, with electron-dense or lamellar content. Phragmoplast microtubules are abundant but organized aberrantly. Thus, MOR1 functions in both phragmoplast and cortical arrays.

Keywords: Arabidopsis thaliana; cortical microtubules; phragmoplast; cell division; roots.
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