List of tables. List of colour plates. List of figures. Preface. 1. General introduction. 2. Mutagenic treatments. Introduction. Chemical mutagens. Physical mutagens. References. 3. Other sources of genetic variation. Introduction. Ploidy mutations. Somaclonal variations. References. 4. Shoot apices: Organization and post-irradiation behaviour. Introduction. Structure and functioning of shoot apices. Behaviour of axillary and adventitious buds. The position of a mutated cell within a plant; chimerism. Rearrangements of cell layers. Shoot apices after irradiation. Patterns of radiation-induced morphological/histological damage and recovery. The fate of a mutated apical cell; diplontic selection. References. 5. Adventitious bud techniques and other in vivo or in vitro methods of asexual propagation of relevance to mutation breeding. Introduction. In vivo techniques. In vitro techniques. 6. Root and tuber crops. General. Cassava. Garlic and shallots. Jerusalem artichoke. Potato. Sweet potato. Yams and various other (tropical) root and tuber crops. 7. Ornamental crops. General. Tuber and bulb crops. Flowering pot plants. Foliage pot plants. Cut flowers. Garden plants. Woody plants. 8. Woody perennials and forest trees. General. Broad-leaved trees. Coniferous trees. Trees used in sericulture (Morus). 9. Fruit crops. Temperate fruit crops. Tree fruits. Small fruits. Grapevine. Tropical fruit crops. 10. Other crops. Essential oil crops. Fiber crops. Rubber. Hops. Sugarcane. Tea. Grasses. Index of references. Index of plant names.