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Impact of taxol‐mediated stabilization of microtubules on nuclear morphology, ploidy levels and cell growth in maize roots

Impact of taxol‐mediated stabilization of microtubules on nuclear morphology, ploidy levels and... Direct contact of the radiating perinuclear microtubules (MTs) with the nuclear envelope was visualized with an immunogold technique using specific monoclonal tubulin antibody. The possibility that these perinuclear MT arrays are involved in establishing and maintaining nuclear organization during the interphase of cycling cells in maize root meristems was tested using taxol, a MT‐stabilizing agent. Taxol not only stabilized all MTs against the action of the MT‐disrupters colchicine and oryzalin but also prevented these agents from their usual induction of nuclear enlargement and decondensation of nuclear chromatin. On the contrary, nuclear size decreased and the chromatin became more compact in mitotically cycling cells of the taxol‐treated root apices. Moreover, taxol prevented the stimulation, by colchicine and oryzalin, of the onset of the S phase in cells of the quiescent centre and proximal root meristem. Exposure of maize roots to taxol strongly decreased final cell volumes, suggesting that the more condensed nuclear chromatin is less efficient in genome expression and that this accounts for the restriction of cellular growth. All these findings support the hypothesis that MT arrays, radiating from the nuclear surface, are an essential part of an integrated plant ‘cell body’ consisting of nucleus and the MT cytoskeleton, and that they regulate, perhaps via their impact on chromatin condensation and activity, progress through the plant cell cycle. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biology of the Cell Wiley

Impact of taxol‐mediated stabilization of microtubules on nuclear morphology, ploidy levels and cell growth in maize roots

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References (31)

Publisher
Wiley
Copyright
1997 Société Française des Microscopies and Société Biologie Cellulaire de France
ISSN
0248-4900
eISSN
1768-322X
DOI
10.1111/j.1768-322X.1997.tb01010.x
Publisher site
See Article on Publisher Site

Abstract

Direct contact of the radiating perinuclear microtubules (MTs) with the nuclear envelope was visualized with an immunogold technique using specific monoclonal tubulin antibody. The possibility that these perinuclear MT arrays are involved in establishing and maintaining nuclear organization during the interphase of cycling cells in maize root meristems was tested using taxol, a MT‐stabilizing agent. Taxol not only stabilized all MTs against the action of the MT‐disrupters colchicine and oryzalin but also prevented these agents from their usual induction of nuclear enlargement and decondensation of nuclear chromatin. On the contrary, nuclear size decreased and the chromatin became more compact in mitotically cycling cells of the taxol‐treated root apices. Moreover, taxol prevented the stimulation, by colchicine and oryzalin, of the onset of the S phase in cells of the quiescent centre and proximal root meristem. Exposure of maize roots to taxol strongly decreased final cell volumes, suggesting that the more condensed nuclear chromatin is less efficient in genome expression and that this accounts for the restriction of cellular growth. All these findings support the hypothesis that MT arrays, radiating from the nuclear surface, are an essential part of an integrated plant ‘cell body’ consisting of nucleus and the MT cytoskeleton, and that they regulate, perhaps via their impact on chromatin condensation and activity, progress through the plant cell cycle.

Journal

Biology of the Cell – Wiley

Published: Jun 1, 1997

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