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Biodiversity and Domestication of Yams in West Africa

Traditional Practices Leading to Dioscorea rotundata Poir.

by Philippe Vernier (writer), Alexandre Dansi (writer), Jeanne Zoundjihèkpon (writer), Roland Dumont (writer)
january 2006
eBook [ePub]
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11,99 €
eBook [PDF]
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A study of yam domestication practices among smallholders has provided an insight into how farmers exploit wild plant genetic resources so as to adapt them to agriculture. This book describes the domestication operations leading to Dioscorea rotundata yams in Africa. The biodiversity of these yams and of their wild relatives is investigated, and the authors put forward hypotheses to explain the phenotypic changes resulting from smallholder practices. These hypotheses could be possible lines of research for breeders.



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

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

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

Domestication process and effects
Thoughts on domestication leading to double-harvest Dioscorea rotundata yams


Glossary of technical terms


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Language(s): English

Publisher: Éditions Quae

Co-publishers: Irstea, Inra, Ifremer

Edition: 1st edition

Collection: Update Sciences & technologies

Published: 1 january 2006

Reference eBook [ePub]: CI953EPB

Reference eBook [PDF]: CI953NUM

EAN13 eBook [ePub]: 9782759211135

EAN13 eBook [PDF]: 9782759201495

Interior: Two-colour

Pages count eBook [PDF]: 104

Size: 5,3 Mo (ePub), 11 Mo (PDF)