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SémIDEEV à l’UMR Génétique Quantitative et Évolution – Le Moulon

Ferme du Moulon – Salle de conférences

Vendredi 18 octobre 2019


Bénédicte RHONÉ
IRD, UMR DIADE, DYNADIV team, Villeurbanne

Invitée par Jérôme Enjalbert

Pearl millet genomic vulnerability to climate change in Africa highlights
the need of regional collaboration for agriculture's adaptation


Climate change is likely to affect agro-ecosystems and to threaten food security by reducing crop productivity and enhancing harvest uncertainty. In this context it is crucial to adapt agricultural practices and to develop strategies to mitigate climate impact. Among them, the use of available agro-biodiversity acts as a valuable strategy to compose with rapid environmental change.

Here we focus on pearl millet, a nutritious staple cereal cultivated in arid and low-fertility soils of sub-Saharan Africa. In this region characterized by rainfed agriculture, the cultivation period depends on the monsoon onset. We analyzed the genomic diversity of 173 landraces of pearl millet collected in West Africa together with climate variation of metrics of agronomical importance aligned with the local monsoon onset. Using ecological genomic model, we project current genomic-environment relationship across space and through time and create landscape predictions under 2 RCP scenarios and 17 models projection of climate change by 2050. We identify the northern edge of both early and late flowering culture areas as the most vulnerable areas to future climate condition. From the model, we predict that future vulnerable areas could benefit from the use of existing landraces from West-Africa with nowadays equivalent climate condition.

However such seed-exchange scenario should involve long-distance and trans-boundaries assisted migrations throughout the region and call for regional collaboration for adaptation of West African agriculture.