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Plant Cell, Vol. 12, 1239-1252, July 2000, Copyright © 2000, American Society of Plant Physiologists

Alterations in the Actin Cytoskeleton of Pollen Tubes Are Induced by the Self-Incompatibility Reaction in Papaver rhoeas

Anja Geitmanna, Benjamin N. Snowmanb, Anne Mie C. Emonsa, and Vernonica E. Franklin-Tongb
a Experimental Plant Morphology and Cell Biology, Wageningen University, 6703 BD Wageningen, The Netherlands
b Wolfson Laboratory for Plant Molecular Biology, School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom

Correspondence to: Anja Geitmann, anja.geitmann{at}guest.pcm.wau.nl (E-mail), 31-317-485005 (fax)

Self-incompatibility (SI) is a genetically controlled process used to prevent self-pollination. In Papaver rhoeas, the induction of SI is triggered by a Ca2+-dependent signaling pathway that results in the rapid and S allele–specific inhibition of pollen tube tip growth. Tip growth of cells is dependent on a functioning actin cytoskeleton. We have investigated the effect of self-incompatibility (S) proteins on the actin cytoskeleton in poppy pollen tubes. Here, we report that the actin cytoskeleton of incompatible pollen tubes is rapidly and dramatically rearranged during the SI response, not only in our in vitro SI system but also in vivo. We demonstrate that nonspecific inhibition of growth does not result in similar actin rearrangements. Because the SI-induced alterations are not observed if growth stops, this clearly demonstrates that these alterations are triggered by the SI signaling cascade rather than merely resulting from the consequent inhibition of growth. We establish a detailed time course of events and discuss the mechanisms that might be involved. Our data strongly implicate a role for the actin cytoskeleton as a target for signaling pathways involved in the SI response of P. rhoeas.




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