Mechanisms of Control of Leaf Movements

INTRODUCTION 84 NYCTINASTIC SPECIES 84 Extensor and Flexor Regions 85 THE CIRCADIAN OSCILLATOR 85 Effects of Light on the Clock 86 Chemical and Physical Probes of the Mechanism 86 RAPIDLY DETECTABLE RESPONSES TO LIGHT AND TEMPERATURE CHANGES 88 Light Effects 88 Temperature Effects 89 TURGOR REGULATION IN THE PULVINUS 89 [(1, ct, and Cell Turgor 90 Evidence for Apoplastic Transport of [(I and ct 92 Roles of the Tonoplast and the Plasmalemma 95 THE MEMBRANE POTENTIAL 95 Methods 95 Data and Interpretations 96 MODEL FOR K+ AND CLMOVEMENTS 97 Basic Postulates 98 [(I and the Membrane Potential: Comparative Kinetics 102 CONCLUSIONS 104