Plant Hormones in Lower Plants.- Endogenous Plant Hormones in Rice in Relation to the Regulation of Its Life Cycle.- I Genetic Approaches.- The Benefit of Biosynthesis and Response Mutants to the Study of the Role of Abscisic Acid in Plants.- A Genetic Approach to Auxins and Cytokinins.- Development of Genetic and Analytical Systems for Studies of Auxin Metabolism.- Developmental Studies of Physcomitrella patens Using Auxin and Cytokinin Sensitivity Mutants.- Dwarf Mutants of Maize — Research Tools for the Analysis of Growth.- Gibberellin Synthesis and Sensitivity Mutants in Pisum.- Gibberellin-Insensitive and Overgrowth Mutations in Temperate Cereals.- II Molecular Aspects.- Auxin and Gene Expression.- IAA Perception and Auxin-Regulated Gene-Expression.- Membrane-Bound Auxin Receptors.- Wound-Induced ACC Synthase, an Immunochemical Comparison of the Wound-Induced and Auxin-Induced Enzymes.- Polyphosphoinositide Turnover and Signal Transduction of Auxin on Isolated Membranes of Daucus carota L..- Complexity of the Barley ?-Amylase Gene Families: Determination of Gene Numbers for Each Family and mRNA Levels for Individual Members.- Regulation of Gene Expression by Abscisic Acid in Barley Aleurone Layers.- Novel Affinity Probes for Gibberellin Receptors in Aleurone Protoplasts of Avena Fatua.- Fusicoccin-Binding Sites in Higher Plants.- Cytokinin Mode of Action — Problems and Perspectives.- A Functional Cytokinin-Binding Protein in Photochemical Reactions of Chloroplast.- Structure-Activity Relationship Studies and Development of s-Triazine and Carbamate Anticytokinins.- Construction of a System for Regulated Alterations of Endogenous Cytokinins.- Ethylene Binding Receptors — Is There More Than One?.- III Hormones and Calcium.- Calcium and Second Messengers in Hormonal Regulation.- The Role of Calcium in the Response of Roots to Auxin and Gravity.- The Role of Calcium in Stimulus-Response Coupling.- IV Hormone Synthesis and Metabolism.- Recent Studies of the Metabolism of Abscisic Acid.- Recent Investigations of the Biochemistry of Abscisic Acid.- Tissue-Specific Metabolism of Both Abscisic Acid and Gibberellins in Legume Seeds.- An Overview of Cytokinin Biosynthesis.- Genetic Differences in the Enzymatic Regulation of Zeatine Metabolism in Phaseolus Embryos.- Xylem-Translocated Cytokinin: Metabolism and Function.- Cytokinin Oxidase and the Degradative Metabolism of Cytokinins.- Metabolic Aspects of Ethylene Biosynthesis.- Conjugation of Gibberellins in Zea mays.- Metabolism of Gibberellins A20 and A9 in Plants: Pathways and Enzymology.- The Dioxygenases in Gibberellin Biosynthesis after Gibberellin A12-Aldehyde.- The Action of Plant Growth Retardants at the Biochemical Level.- Measurement of the in Vivo Rate of Indole-3-Acetic Acid Turnover.- Relationship Between Stimuli, IAA and Growth.- Oxidation of Indole-3-Acetylaspartic Acid in Vicia.- Indole-3-Ethanol Metabolism and Its Possible Role in the Regulation of Indole-3-Acetic Acid Biosynthesis.- The Oxindole-3-Acetic Acid Pathway in Zea mays.- Metabolism of Jasmonic Acid.- V Hormones: Physiology and Effects.- How Abscisic Acid Causes Depressions of the Photosynthetic Capacity of Leaves.- The Role of Abscisic Acid in Chilling Resistance.- Dormancy in Cereals — Levels of and Response to Abscisic Acid.- Auxin Regulation of Cell Differentiation in Moss Protonema.- The Second Messenger in Apical Dominance Controlled by Auxin.- Auxin Transport and Its Regulation by Flavonoids.- GC-MS Quantifications of Free and Ester Indol-3-Acetic Acid in Relation to Root Growth and Gravitropism.- Hemmstoff und Wachstum: Growth Inhibitors, Not Auxin, Regulate Phototropism.- Cytokinins as Metabolic Stimulants Which Induce Pod Set.- Gibberellins in Embryo Development.- Gibberellins and Flower Initiation in Herbaceous Angiosperms.- Cytokinins in Flower Initiation.- Hormones and Cuscuta Development: Influence of Hormones on Secondary Xylem Differentiation, Phenylalanine Ammonia Lyase Activity and Lignification.- The Regulation of Tumor Morphology in Crown Gall.- Cytokinin: Evidence for Spatial Control of Signal Transduction.- Plant Wound Signals and Translation.- The Effect of Growth Regulators on the Winter Survival of Winter Wheat.- Hormonal Control of Senescence.- The Possible Role of Protein Kinases in the Plant Cell Response to Phytohormones.- VI Practical Applications and Economic Implications.- New Types of Plant Growth Regulators of Microbial Origin: The Likelihood of Practical Use.- Can PGRs Alleviate the Recently Evolved Cross Resistances to Herbicides?.- Economic Aspects of Plant Growth Regulators.- Practical Considerations in Using Growth Regulators on Turfgrass.- New Aspects for the Practical Use of Ethylene-Releasing Compounds.- Commercial Uses of Gibberellins and Cytokinins and New Areas of Applied Research.- New Types of Plant Growth Retardants: Additional Perspectives for Practical Application in Agriculture and Horticulture.