African yam domestication in light of the NGS revolution

Scarcelli Nora, Cubry Philippe, Akakpo Roland, Thuillet Anne-Céline, Obidiegwu Jude, Baco Mohamed N., Otoo Emmanuel, Sonké Bonaventure, Dansi Alexandre, Djedatin Gustave, Mariac Cédric, Couderc Marie, Causse Sandrine, Alix Karine, Chaïr Hâna, François Olivier, Vigouroux Yves. 2019. African yam domestication in light of the NGS revolution. In : Dedicated to the origins of agriculture and the domestication, evolution and utilization of genetic resources. Abstracts book. IRD, Bioversity International, Agropolis International, CIRAD, Montpellier SupAgro, Université de Montpellier, INRA. Montpellier : IRD, Résumé, p. 42. Jack R. Harlan International Symposium. 3, Montpellier, France, 3 June 2019/7 June 2019.

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Abstract : Yam (Dioscorea sp.) produces a starchy tuber cultivated for human consumption. It is a backbone for food security in tropical countries, especially in West Africa. The most cultivated species, D. rotundata, originated from Africa. However, due to the lack of archaeological data and genetic tools, very little is known about yam domestication. Currently, the wild progenitor of yam is unclear and the geographical origin of yam cultivation has not been elucidated. Here, we took advantage of the recent sequencing of the D. rotundata genome and the development of new powerful analyses to get new insights into the domestication process of African yam. We analyzed a large sampling of cultivated yam and its two closest wild relatives, the savannah species D. abyssinica and the forest species D. praehensilis, collected in West Africa and Cameroon. Whole genome resequencing produced more than 3 million good quality SNPs and revealed a strong genetic structure between the three species, as well as between Cameroon and West African countries. Using coalescent models, we showed that cultivated yam was domesticated from the forest species D. praehensilis. Spatially explicit models inferred an origin of yam culture expansion in the Niger River basin, in a region located in north Benin.

Auteurs et affiliations

  • Scarcelli Nora, IRD (FRA)
  • Cubry Philippe, CIRAD-BIOS-UMR DAP (FRA)
  • Akakpo Roland, IRD (FRA)
  • Thuillet Anne-Céline, IRD (FRA)
  • Obidiegwu Jude, NRCRI (NGA)
  • Baco Mohamed N., Université de Parakou (BEN)
  • Otoo Emmanuel, CSIR (GHA)
  • Sonké Bonaventure, Université de Yaoundé (CMR)
  • Dansi Alexandre, UAC (BEN)
  • Djedatin Gustave, UAC (BEN)
  • Mariac Cédric, IRD (FRA)
  • Couderc Marie, IRD (FRA)
  • Causse Sandrine, CIRAD-BIOS-UMR AGAP (FRA)
  • Alix Karine, INRA (FRA)
  • François Olivier, Université de Grenoble (FRA)
  • Vigouroux Yves, IRD (FRA)

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