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Acknowledgements Foreword Introduction The Dioscorea rotundata Poir. yam Botanical aspects Geographical distribution Botanical origins of Dioscorea rotundata Organization of diversity in Dioscorea rotundata . Yam diversity on African farms . State of the scientific knowledge Morphological and physiological diversity Genetic diversity Chemical diversity Cooking quality Sexual features Cultivation requirements Intrinsic productivity of the plant material Market adaptation Wild yams Dioscorea praehensilis Benth and Dioscorea abyssinica Hochst ex Kunth General Dioscorea praehensilis Dioscorea abyssinica Addendum: Dioscorea togoensis Knuth Phenomena that could explain the variability of wildand domesticated yams Climatic disturbance Anthropogenic pressure Reciprocal gene flow between wild and cultivated yams Effects of periodic fallows Variations in genome expression Mutation Ploidization Domestication leading to Dioscorea rotundata Definitions and general aspects Rationales and limits of domestication . Significance and importance of domestication for farmers . Framework of domestication Cultivation techniques used to transform wild yams into double-harvest Dioscorea rotundata yams General Domestication process and effects Thoughts on domestication leading to double-harvest Dioscorea rotundata yams Conclusion Glossary of technical terms References

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