Journal Article

Cortical Microtubule Arrays Lose Uniform Alignment Between Cells and are Oryzalin Resistant in the Arabidopsis Mutant, <i>radially swollen 6</i>

Alex Bannigan, Allison M. D. Wiedemeier, Richard E. Williamson, Robyn L. Overall and Tobias I. Baskin

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 7, pages 949-958
Published in print July 2006 | ISSN: 0032-0781
Published online July 2006 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcj067
Cortical Microtubule Arrays Lose Uniform Alignment Between Cells and are Oryzalin Resistant in the Arabidopsis Mutant, radially swollen 6

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

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The coordinated expansion of cells is essential to the formation of correctly shaped plant tissues and organs. Members of the radially swollen (rsw) class of temperature-sensitive arabidopsis mutants were isolated in a screen for reduced anisotropic expansion, by selecting plants with radially swollen root tips. Here we describe rsw6, in which cortical microtubules in the root epidermis are well organized in parallel arrays within cells, but neighboring cells frequently contain arrays differing in their mean orientation by up to 90°. Microtubules in rsw6 are more resistant to oryzalin-induced depolymerization than wild-type microtubules, and their reorientation is accompanied by swelling of the epidermal cells. The reorientation phenotype is blocked by taxol and by the depolymerization of actin filaments. We propose that rsw6 microtubule organization is functional on a local level, but defective on a global scale. The rsw6 mutant provides a unique tool with which to study the coordination of microtubule organization at a multicellular level.

Keywords: Cytoskeleton; Epidermis; Oryzalin; Radial expansion; Root; Taxol

Journal Article.  5490 words.  Illustrated.

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

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