The 9th International Conference on Plant Growth Substances was held at the University of Lausanne, August 30-September 4, 1976. This meet­ ing was sponsored by the National Swiss Foundation for Scientific Re­ search (FNRS), the Fonds Herbette of the Faculty of Sciences of Lau­ sanne, by several other official sources, and by a few Swiss indus­ tries. The conference was attended by over 420 scientists, represent­ ing 42 countries, with a total of 550 participants. Our 9th conference was rather different from the previous ones. The usual short submitted papers followed by a too brief discussion were replaced by three kinds of scientific communications. First in the reports, authors gave a critical analysis of a selection of broad to­ pics, directing their comments to new perspectives of research and me­ thodology. Second, the paper demonstrations, presented by over 200 scientists, induced large and fruitful discussions and ensured that personal contacts were made. Finally, during four workshops, several interesting points - introduced in the reports and paper demonstra­ tions - were developed and discussed.

Inhalt

I. The Wall of Growing Cells.- 1. The Molecular Structure of the Primary Cell Wall and Elongation Growth.- 2. Cellulose Metabolism and Cell Growth.- 3. Wall Extensibility in Relation to Auxin Effects.- II. Hormones - Membranes.- 4. Membrane-Bound Auxin Receptors: Solubilization and Characterization.- 5. Auxin Hormone-Plasma Membrane Interactions.- 6. Interactions Between Indole-3-Acetic Acid and Phospholipids in Deuterochloroform as Determined by 1H, 13C, and 31P NMR Spectrometry.- 7. Physiologic Implications of the Hormonal Control of Ion Transport in Plants.- III. Hormone Analysis.- 8. The Application of High Performance Liquid Chromatography to the Analysis of Plant Hormones.- 9. Gas Chromatographic Identification and Quantitative Estimation of Natural Auxins in Developing Plant Organs.- IV. Auxins and Root Growth Inhibitors.- 10. Interactions in Translocation of Growth Regulators in Shoots with Special Reference to Auxin Transport as Affected by Two Inhibitors, a Morphactin and Lycoricidinol.- 11. Auxins and the Regulation of Root Growth.- 12. Root Growth Inhibitors.- 13. Growth Inhibitors in Growing and Geostimulated Maize Roots.- V. Gibberellins and Cytokinins.- 14. Some Aspects of Gibberellin Metabolism in Higher Plants.- 15. Cytokinin-Binding Proteins in Higher Plants.- 16. Cytokinin Relations in the Whole Plant.- 17. Cytokinin and Cell Metabolism.- VI. Ethylene and Other Regulators.- 18. Auxin and Ethylene and the Control of Cell Growth. Identification of Three Classes of Target Cells.- 19. On the Role of Ethylene in Aging.- 20. Phenolic Substances and Their Possible Role in Plant Growth Regulation.- 21. Some effects of Dikegulac on the Physiology of Whole Plants and Tissues; Interactions with Plant Hormones.- VII. Gravity and Light Effects.- 22. Geotropic Response Mechanism in Root and Shoots.- 23. Ultrastructural Aspects of Georeceptors in Roots.- 24. Hormonal Regulation of Phototropism in Dicotyledonous Seedlings.- 25. Light, Rhythmus, and the Problem of Florigen.- VIII. Hormonal Control.- 26. The Hormonal Regulation of the Cell Division Cycle.- 27. Hormonal Controls of Abscission: Biochemical and Ultrastructural Aspects.- 28. Hormonal Regulators of Plant Flowering.- 29. Hormonal Relationships in Whole Plant Senescence.- 30. Growth Substances and Protoplasts.- IX. Paper Demonstrations.