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Plant and Cell Physiology Advance Access published online on June 7, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj067
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received February 17, 2006
Accepted May 24, 2006

Regular Paper

Cortical Microtubule Arrays Lose Uniform Alignment between Cells and Are Oryzalin Resistant in the Arabidopsis Mutant, radially swollen 6

Alex Bannigan 1 *, Allison M. D. Wiedemeier 2, Richard E. Williamson 3, Robyn L. Overall 4, and Tobias I. Baskin 5

1 Biology Department, University of Massachusetts, Amherst, MA, USA; School of Biological Sciences, University of Sydney, NSW, Australia
2 Division of Biological Sciences, University of Missouri, Columbia, MO, USA
3 Plant Cell Biology Group, Australian National University, Canberra, ACT, Australia
4 School of Biological Sciences, University of Sydney, NSW, Australia
5 Biology Department, University of Massachusetts, Amherst, MA, USA

* To whom correspondence should be addressed.
Alex Bannigan, E-mail: alexb{at}bio.umass.edu


  Abstract

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 co-ordination of microtubule organization at a multicellular level.

Keywords: root; epidermis; oryzalin; radial expansion; taxol; cytoskeleton.
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