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Yam genomics supports West Africa as a major cradle of crop domestication
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Edité par CCSD ; American Association for the Advancement of Science (AAAS) -
Data and materials availability: All scripts used for bioinformatic treatment and statistical analyses are available in a github repository accessible at https://github.com/Africrop/Yam. Raw data (.fastq) are available on GenBank, Bioproject PRJNA515691. SNP matrix (.vcf file) is available at https://doi.org/10.5281/zenodo.2540773. Remaining DNA or leaf samples can be provided by CSIR-CRI (Ghana), University of Parakou (Benin), NRCRI (Nigeria) or University Yaoundé I (Cameroon), pending scientific review, and a completed materials transfer agreement. Requests for the DNA or leaf samples should be submitted to the corresponding author (N.S.). All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Additional data related to this paper may be requested from the authors.. International audience. While there has been progress in our understanding of the origin and history of agriculture in sub-Saharan Africa, a unified perspective is still lacking on where and how major crops were domesticated in the region. Here, we investigated the domestication of African yam (Dioscorea rotundata), a key crop in early African agriculture. Using whole-genome resequencing and statistical models, we show that cultivated yam was domesticated from a forest species. We infer that the expansion of African yam agriculture started in the Niger River basin. This result, along-side with the origins of African rice and pearl millet, supports the hypothesis that the vicinity of the Niger River was a major cradle of African agriculture.
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