List of contributors; Preface; 1. Sexual signalling in Chlamydomonas H. van den Ende; 2. Gamete recognition and fertilisation in the fucoid algae J. A. Callow, C. J. Stafford and J. R. Green; 3. The fungal surface and its role in sexual interactions G. W. Gooday; 4. Gamete recognition in angiosperms: model and strategy for analysis A. Chaboud, R. Perez, C. Digonnet and C. Dumas; 5. The molecular biology of self-incompatible responses F. C. H. Franklin, R. M. Hackett and V. E. Franklin-Tong; 6. Cell surface arabinogalactan proteins, arabinogalactans and plant development R. I. Pennell; 7. Local and systemic signalling during a plant defence response D. Bowles; 8. Contact sensing during infection by fungal pathogens N. J. Read, L. J. Kellock, H. Knight and A. J. Trewavas; 9. The electrophysiology of root-zoospore interactions N. A. R. Gow, B. M. Morris and B. Reid; 10. Molecular differentiation and development of the host-parasite interface in powdery mildew of pea J. R. Green, A. J. Mackie, A. M. Roberts and J. A. Callow; 11. Recognition signals and initiation of host responses controlling basic incompatibility between fungi and plants J. P. Ride; 12. Cell surface interactions in endomycorrhizal symbiosis P. Bonfante-Fasolo, R. Peretto and S. Perotto; 13. Host recognition in the Rhizobium leguminosarum-pea symbiosis J. A. Downie, M. -A. Barny, T. M. Cubo, A. Davies, A. Economou, J. L. Firmin, A. W. B. Johnston, C. Marie, A. Mavridou, R. Rivilla, A. -K. Scheu, J. M. Sutton and K. E. Wilson; 14. The Rhizobium trap: root hair curling in the root nodule symbiosis J. W. Kijne, R. Bakhuizen, A. A. N. van Brussel, H. C. J. Canter Cremers, C. L. Diaz, B. S. de Pater, G. Smit, H. P. Spiank, S. Swart, C. A. Wijffelman and B. J. J. Lugtenberg; 15. Structure and function of Rhizobium lipopolysaccharide in relation to legume nodule development N. J. Berwin, E. A. Rathburn, S. Perotto, A. Gunder, A. L. Rae and E. L. Kannenberg; Index.