Microtubules regulate tip growth and orientation in root hairs of Arabidopsis thaliana

Microtubules regulate tip growth and orientation in root hairs of Arabidopsis thaliana Summary The polarized growth of cells as diverse as fungal hyphae, pollen tubes, algal rhizoids and root hairs is characterized by a highly localized regulation of cell expansion confined to the growing tip. In apically growing plant cells, a tip‐focused (Ca2+)c gradient and the cytoskeleton have been associated with growth. Although actin has been established to be essential for the maintenance of elongation, the role of microtubules remains unclear. To address whether the microtubule cytoskeleton is involved in root hair growth and orientation, we applied microtubule antagonists to root hairs of Arabidopsis . In this report, we show that depolymerizing or stabilizing the microtubule cytoskeleton of these apically growing root hairs led to a loss of directionality of growth and the formation of multiple, independent growth points in a single root hair. Each growing point contained a tip‐focused gradient of (Ca2+)c. Experimental generation of a new (Ca2+)c gradient in root hairs pre‐treated with microtubule antagonists, using the caged‐calcium ionophore Br‐A23187, was capable of inducing the formation of a new growth point at the site of elevated calcium influx. These data indicate a role for microtubules in regulating the directionality and stability of apical growth in root hairs. In addition, these results suggest that the action of the microtubules may be mediated through interactions with the cellular machinery that maintains the (Ca2+)c gradient at the tip. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

Microtubules regulate tip growth and orientation in root hairs of Arabidopsis thaliana

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Publisher
Wiley
Copyright
Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
D.O.I.
10.1046/j.1365-313X.1999.00415.x
Publisher site
See Article on Publisher Site

Abstract

Summary The polarized growth of cells as diverse as fungal hyphae, pollen tubes, algal rhizoids and root hairs is characterized by a highly localized regulation of cell expansion confined to the growing tip. In apically growing plant cells, a tip‐focused (Ca2+)c gradient and the cytoskeleton have been associated with growth. Although actin has been established to be essential for the maintenance of elongation, the role of microtubules remains unclear. To address whether the microtubule cytoskeleton is involved in root hair growth and orientation, we applied microtubule antagonists to root hairs of Arabidopsis . In this report, we show that depolymerizing or stabilizing the microtubule cytoskeleton of these apically growing root hairs led to a loss of directionality of growth and the formation of multiple, independent growth points in a single root hair. Each growing point contained a tip‐focused gradient of (Ca2+)c. Experimental generation of a new (Ca2+)c gradient in root hairs pre‐treated with microtubule antagonists, using the caged‐calcium ionophore Br‐A23187, was capable of inducing the formation of a new growth point at the site of elevated calcium influx. These data indicate a role for microtubules in regulating the directionality and stability of apical growth in root hairs. In addition, these results suggest that the action of the microtubules may be mediated through interactions with the cellular machinery that maintains the (Ca2+)c gradient at the tip.

Journal

The Plant JournalWiley

Published: Mar 1, 1999

References

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