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Microtubule array reorientation in response to hormones does not involve changes in microtubule nucleation modes at the periclinal cell surface.

Authors
  • Atkinson, Samantha
  • Kirik, Angela
  • Kirik, Viktor
Type
Published Article
Journal
Journal of Experimental Botany
Publisher
Oxford University Press
Publication Date
Nov 01, 2014
Volume
65
Issue
20
Pages
5867–5875
Identifiers
DOI: 10.1093/jxb/eru325
PMID: 25135522
Source
Medline
Keywords
License
Unknown

Abstract

Aligned microtubule arrays spatially organize cell division, trafficking, and determine the direction of cell expansion in plant cells. In response to changes in environmental and developmental signals, cells reorganize their microtubule arrays into new configurations. Here, we tested the role of microtubule nucleation during hormone-induced microtubule array reorientation. We have found that in the process of microtubule array reorientation the ratios between branching, parallel, and de-novo nucleations remained constant, suggesting that the microtubule reorientation mechanism does not involve changes in nucleation modes. In the ton2/fass mutant, which has reduced microtubule branching nucleation frequency and decreased nucleation activity of the γ-tubulin complexes, microtubule arrays were able to reorient. Presented data suggest that reorientation of microtubules into transverse arrays in response to hormones does not involve changes in microtubule nucleation at the periclinal cell surface.

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