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First published online September 24, 2003; 10.1105/tpc.014977

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The Plant Cell, Vol. 15, 2666-2679, November 2003, www.plantcell.org ©2003, American Society of Plant Biologists

Phospholipase D Activation Correlates with Microtubule Reorganization in Living Plant Cells

Pankaj Dhonukshea, Ana M. Laxalt1,b, Joachim Goedharta, Theodorus W. J. Gadellaa and Teun Munnik2,b

a Section of Molecular Cytology, Swammerdam Institute for Life Sciences, University of Amsterdam, NL-1090 GB Amsterdam, The Netherlands
b Section of Plant Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, NL-1090 GB Amsterdam, The Netherlands

2 To whom correspondence should be addressed. E-mail munnik{at}science.uva.nl; fax 31-20-5257934

A phospholipase D (PLD) was shown recently to decorate microtubules in plant cells. Therefore, we used tobacco BY-2 cells expressing the microtubule reporter GFP-MAP4 to test whether PLD activation affects the organization of plant microtubules. Within 30 min of adding n-butanol, a potent activator of PLD, cortical microtubules were released from the plasma membrane and partially depolymerized, as visualized with four-dimensional confocal imaging. The isomers sec- and tert-butanol, which did not activate PLD, did not affect microtubule organization. The effect of treatment on PLD activation was monitored by the in vivo formation of phosphatidylbutanol, a specific reporter of PLD activity. Tobacco cells also were treated with mastoparan, xylanase, NaCl, and hypoosmotic stress as reported activators of PLD. We confirmed the reports and found that all treatments induced microtubule reorganization and PLD activation within the same time frame. PLD still was activated in microtubule-stabilized (taxol) and microtubule-depolymerized (oryzalin) situations, suggesting that PLD activation triggers microtubular reorganization and not vice versa. Exogenously applied water-soluble synthetic phosphatidic acid did not affect the microtubular cytoskeleton. Cell cycle studies revealed that n-butanol influenced not just interphase cortical microtubules but also those in the preprophase band and phragmoplast, but not those in the spindle structure. Cell growth and division were inhibited in the presence of n-butanol, whereas sec- and tert-butanol had no such effects. Using these novel insights, we propose a model for the mechanism by which PLD activation triggers microtubule reorganization in plant cells.




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