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THE PLANT CELL, Vol 9, Issue 10 1815-1824, Copyright © 1997 by American Society of Plant Biologists
Probing the Plant Actin Cytoskeleton during Cytokinesis and Interphase by Profilin Microinjection
A. H. Valster, E. S. Pierson, R. Valenta, P. K. Hepler and AMC. Emons
Department of BioMolecular Sciences, Wageningen Agricultural University, Arboretumlaan 4, NL-6703 BD Wageningen, The Netherlands
We have examined the cytological effects of microinjecting recombinant
birch profilin in dividing and interphase stamen hair cells of Tradescantia
virginiana. Microinjection of profilin at anaphase and telophase led to a
marked effect on cytokinesis; cell plate formation was often delayed,
blocked, or completely inhibited. In addition, the initial appearance of
the cell plate was wrinkled, thin, and sometimes fragmented. Injection of
profilin at interphase caused a thinning or the collapse of cytoplasmic
strands and a retardation or inhibition of cytoplasmic streaming in a
dose-dependent manner. Confocal laser scanning microscopy of
rhodamine-phalloidin staining in vivo revealed that high levels of
microinjected profilin induced a degradation of the actin cytoskeleton in
the phragmoplast, the perinuclear zone, and the cytoplasmic strands.
However, some cortical actin filaments remained intact. The data
demonstrate that profilin has the ability to act as a regulator of
actin-dependent events and that centrally located actin filaments are more
sensitive to microinjected profilin than are cortical actin filaments.
These results add new evidence supporting the hypothesis that actin
filaments play a crucial role in the formation of the cell plate and
provide mechanical support for the cytoplasmic strands in interphase cells.
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