The intracellular events triggered by the self-incompatibility response inPapaver rhoeas |
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Authors: | M J Wheeler A C Allan N D Jordan J J Rudd V E Franklin-Tong F C H Franklin |
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Institution: | (1) Wolfson Laboratory for Plant Molecular Biology, School of Biological Sciences, University of Birmingham, B15 2TT Edgbaston, Birmingham, UK;(2) HortResearch, Auckland |
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Abstract: | Summary In recent years self-incompatibility (SI) has come to be recognised as an important model system for studying cell-cell interactions and signalling in flowering plants. In this article we discuss the intracellular events associated with the SI response in the field poppy,Papaver rhoeas. The SI response inP. rhoeas is known to involve a Ca2+-based signalling pathway, activated following molecular interactions on the surface of incompatible pollen tubes. Evidence demonstrates that, following a transient increase in the concentration of cytosolic free Ca2+ (Ca2+];) initiated by the SI response, phosphorylation of certain cytosolic proteins occurs, followed by activation of pollen gene expression. The magnitude of this transient Ca2+ wave and the localisation of cytosolic Ca2+]i following the SI response are discussed. We also describe the character of the proteins specifically phosphorylated in the SI response and the nature of the protein kinases involved in their phosphorylation. Finally, we consider the possibility that the end result of the SI response inP. rhoeas may be analogous to programmed-cell-death mechanisms such as those seen in developmental processes and defence responses in various plant cells. |
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Keywords: | Papaver rhoeas Self-incompatibility Calcium Signal transduction Cell-cell recognition |
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