Anthony Yeo

15.1 Introduction 371

15.2 Occurrence of desiccation tolerance 372

15.3 Desiccation tolerance in seeds 372

15.3.1 Intracellular physical characteristics 374

15.3.2 Intracellular de-differentiation 374

15.3.3 'Switching-off' metabolism 375

15.3.4 Antioxidant systems 375

15.3.5 Protective molecules 376

15.3.6 Amphiphilic molecules 378

15.3.7 Oleosins 379

15.3.8 Damage repair 379

15.4 Vegetative tissues 379

15.4.1 Gene expression 382

15.4.2 Physical characteristics 382

15.4.3 Metabolism and antioxidants 383

15.4.4 Low-molecular-weight carbohydrates 383

15.4.5 Hydrins or LEA proteins 385

15.4.6 Signals 385

15.4.7 Constraints to the development of desiccation tolerance 386

15.5 Concluding remarks 388 Acknowledgements 388

References 388

Index 391

The colour plate section appears after page 78

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