Cortical microtubule arrays lose uniform alignment between cells and are oryzalin resistant in the Arabidopsis mutant, radially swollen 6

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 swoll...

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Veröffentlicht in:Plant and cell physiology 2006-07, Vol.47 (7), p.949-958
Hauptverfasser: Bannigan, A.(University of Massachusetts, Amherst (USA)), Wiedemeier, A.M.D, Williamson, R.E, Overall, R.L, Baskin, T.I
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container_issue 7
container_start_page 949
container_title Plant and cell physiology
container_volume 47
creator Bannigan, A.(University of Massachusetts, Amherst (USA))
Wiedemeier, A.M.D
Williamson, R.E
Overall, R.L
Baskin, T.I
description 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 90deg. 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.
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subjects Actins - physiology
Anisotropy
Antineoplastic Agents, Phytogenic - pharmacology
ARABIDOPSIS
Arabidopsis - cytology
Arabidopsis - genetics
Arabidopsis Proteins - genetics
Cell Line
Dinitrobenzenes - pharmacology
Drug Resistance
EPIDERME
EPIDERMIS
Genes, Plant - genetics
MICROTUBULE
MICROTUBULES
Microtubules - drug effects
Microtubules - ultrastructure
MICROTUBULOS
MUTANT
MUTANTES
MUTANTS
Mutation - genetics
ORIZALINA
ORYZALIN
Paclitaxel - pharmacology
Phenotype
Plant Roots - cytology
Plant Roots - drug effects
Plant Roots - growth & development
Plants, Genetically Modified
RACINE
RAICES
ROOTS
Sulfanilamides - pharmacology
TAXOL
Tubulin Modulators - pharmacology
title Cortical microtubule arrays lose uniform alignment between cells and are oryzalin resistant in the Arabidopsis mutant, radially swollen 6
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