Work related to this thesis is published as: Poulter N. S., Vatovec S. and Franklin-Tong V. E. 2008. Microtubules are a target for self-incompatibility signaling in Papaver pollen. Plant Physiol., 146: 1358-1367 http://eprints.bham.ac.uk/1120/ Wheeler M. J., De Graaf B. H. J., Hadjiosif N., Perry R. M., Poulter N. S., Osman K., Vatovec S., Harper A., Franklin F. C. H. and Franklin-Tong V. E. (2009) Identification of the pollen self-incompatibility determinant in Papaver rhoeas. Nature, 459: 992-995. DOI:10.1038/nature08027 Bosch M., Poulter N. S., Vatovec S. and Franklin-Tong V. E. 2008. Initiation of programmed cell death in self-incompatibility: role for cytoskeleton modifications and several caspase-like activities. Molecular Plant, 1: 879-887. Wheeler M. J., Vatovec S. and Franklin-Tong V. E. (2010) The pollen S-determinant in Papaver: comparisons with known plant receptors and protein ligand partners. Journal of Experimental Botany, 61: 2015-2025. DOI:10.1093/jxb/erp383 De Graaf B.H.J.*, Vatovec S.*, Juárez-Díaz J.A.*, Zou H., Chai L., Kooblall K., Forbes T., Wilkins K.A., Franklin F.C.H. and Franklin-Tong V.E. (2012) The Papaver self-incompatibility pollen S-determinant, PrpS, functions in Arabidopsis thaliana. Current Biology 22, 154–159, January 24, 2012 DOI 10.1016/j.cub.2011.12.006