Abstract
Self-incompatibility (SI) is a genetically con- trolled system used by many flowering plants to prevent self-pollination. We established, using calcium imaging, that the SI response in Papaver rhoeasL. (poppy) pollen involves a Ca 2+ -mediated intracellular signalling path- way. Here we review what is known about the signalling components and cascades implicated in the SI response in poppy pollen. We present some studies using calcium green (CG-1) that show SI-induced alterations in CG-1 fluorescence and localization. We have begun to exam- ine potential sources of Ca 2+ involved in the responses induced by SI. This work presents preliminary data showing that influx of extracellular Ca 2+ at the "shank" of the pollen tube is possible. This is the first evidence suggesting that influx at this localization may play a role in the SI response. We also describe preliminary studies that begin to investigate whether the phosphoinositide signalling pathway is implicated in the SI response.
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