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JXB Advance Access originally published online on September 14, 2007
Journal of Experimental Botany 2008 59(3):481-490; doi:10.1093/jxb/erm195
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Focus Review Paper

Self-incompatibility in Papaver: signalling to trigger PCD in incompatible pollen

Maurice Bosch* and Vernonica E. Franklin-Tong

School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

* To whom correspondence should be addressed. E-mail: M.Bosch{at}bham.ac.uk

Sexual reproduction in higher plants uses pollination, involving interactions between pollen and pistil. Self-incompatibility (SI) prevents self-fertilization, providing an important mechanism to promote outbreeding. SI is controlled by the S-locus; discrimination occurs between incompatible pollen, which is rejected, while compatible pollen can achieve fertilization. In Papaver rhoeas, S proteins encoded by the pistil part of the S-locus interact with incompatible pollen to effect rapid inhibition of tip growth. This self-incompatible interaction triggers a Ca2+-dependent signalling cascade. SI-specific events triggered in incompatible pollen include rapid depolymerization of the actin cytoskeleton; phosphorylation of soluble inorganic pyrophosphatases, and activation of a MAPK. It has recently been shown that programmed cell death (PCD) is triggered by SI. This provides a precise mechanism for the specific destruction of ‘self’ pollen. Recent data providing evidence for SI-induced caspase-3-like protease activity, and the involvement of actin depolymerization and MAPK activation in SI-mediated PCD will be discussed. These studies not only significantly advance our understanding of the mechanisms involved in SI, but also contribute to our understanding of functional links between signalling components and initiation of PCD in a plant cell. Recent data demonstrating SI-mediated modification of soluble inorganic pyrophosphatases are also described.

Key words: Actin cytoskeleton, caspase, MAP kinase, Papaver rhoeas, pollen tube inhibition, programmed cell death (PCD), self-incompatibility

Received 1 May 2007; Revised 18 July 2007 Accepted 24 July 2007


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