Journal Article

Aberrant Cell Plate Formation in the <i>Arabidopsis thaliana</i> <i>microtubule organization 1</i> Mutant

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 4, pages 671-675
Published in print April 2005 | ISSN: 0032-0781
Published online April 2005 | e-ISSN: 1471-9053 | DOI:
Aberrant Cell Plate Formation in the Arabidopsis thaliana microtubule organization 1 Mutant

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry


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MICROTUBULE 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; Cell division; Cortical microtubules; Phragmoplast; Roots

Journal Article.  2980 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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