I. Introduction and Methodology. 1. Introduction: nature, occurrence and functioning of plant hormones (R.E. Cleland). 2. Physico-chemical methods of plant hormone analysis (A. Crozier, T. Moritz). 3. Immunological methods of plant hormone research (M.H. Beale). 4. Structure activity relationships of plant growth regulators (G.F. Katekar). II Control of Hormone Synthesis and Metabolism. 5. Auxins (J.T. Slovin, R.S. Bandurski, J.D. Cohen). 6. Control of cytokinin biosynthesis and metabolism (E. Zazimalova, A. Brezinova, V. Motyka, M. Kaminek). 7. Regulation of gibberellin biosynthesis (P. Hedden). 8. Abscisis acid metabolism and its regulation (J.A.D. Zeevaart). 9. Control of ethylene synthesis and metabolism (H. Imaseki). 10. Oligosaccharins as regulators of plant growth (S.C. Fry). 11. Jasmonic acid and related compounds (T. Yoshihara). 12. Brassinosteroids (T. Yokota). 13. Salicylic acid and biosynthesis (M.C. Verberne, R.A.B. Muljono, R. Verpoorte). III Hormone Perception and Transduction. 14. Molecular characteristics and cellular roles of guanine nucleotide binding proteins in plant cells (P.A. Millner, T.H. Carr). 15. Hormonal regulation of ion transporters: the guard cell system (S.M. Assmann, F. Armstrong). 16. Hormone-cytoskeleton interactions in plant cells (F. Baluska, D. Volkmann, P.W. Barlow). 17. Molecular approaches to study plant hormone signalling (R. Offringa, P.J.J. Hooykaas). 18. Auxin perception and signal transduction (M. Estelle). 19. Auxin regulated genes and promoters (T.J. Guilfoyle). 20. Cytokinin perception and signal transduction (J.-D. Faure, S.H. Howell). 21. Perception and transduction of ethylene (M.A. Hall, A.R. Smith, G.V. Novikova, I.E. Moshkov). 22. Abscisic acid perception and transduction (P.K. Busk, A. Borrell, D. Kizis, M. Pages). 23. Salicylic acid: signal perception and transduction (J. Shah, D.F. Klessig).