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Originally published in Science Express on 24 April 2003
Science 13 June 2003:
Vol. 300. no. 5626, pp. 1715 - 1718
DOI: 10.1126/science.1083529
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Research Articles

Sustained Microtubule Treadmilling in Arabidopsis Cortical Arrays

Sidney L. Shaw,1 Roheena Kamyar,2 David W. Ehrhardt2*

Plant cells create highly structured microtubule arrays at the cell cortex without a central organizing center to anchor the microtubule ends. In vivo imaging of individual microtubules in Arabidopsis plants revealed that new microtubules are initiated at the cell cortex and exhibit dynamics at both ends. Polymerization-biased dynamic instability at one end and slow depolymerization at the other end result in sustained microtubule migration across the cell cortex by a hybrid treadmilling mechanism. This motility causes widespread microtubule repositioning and contributes to changes in array organization through microtubule reorientation and bundling.

1 Department of Biological Sciences, Stanford University, Stanford, CA 94305, USA.
2 Department of Plant Biology, Carnegie Institution of Washington, Stanford, CA 94305, USA.

* To whom correspondence should be addressed. E-mail: ehrhardt{at}andrew2.stanford.edu

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