Past and present dynamics of sorghum and pearl millet diversity in Mount Kenya region

Labeyrie Vanesse, Deu Monique, Dussert Yann, Rono Bernard, Lamy Françoise, Marangu Charles, Kiambi Dan, Calatayud Caroline, Coppens D'Eeckenbrugge Geo, Robert Thierry, Leclerc Christian. 2016. Past and present dynamics of sorghum and pearl millet diversity in Mount Kenya region. Evolutionary Applications, 9 (10) : 1241-1257.

Quartile : Q1, Sujet : EVOLUTIONARY BIOLOGY

Résumé : Crop populations in smallholder farming systems are shaped by the interaction of biological, ecological, and social processes, occurring on different spatiotemporal scales. Understanding these dynamics is fundamental for the conservation of crop genetic resources. In this study, we investigated the processes involved in sorghum and pearl millet diversity dynamics on Mount Kenya. Surveys were conducted in ten sites distributed along two elevation transects and occupied by six ethnolinguistic groups. Varieties of both species grown in each site were inventoried and characterized using SSR markers. Genetic diversity was analyzed using both individual- and population-based approaches. Surveys of seed lot sources allowed characterizing seed-mediated gene flow. Past sorghum diffusion dynamics were explored by comparing Mount Kenya sorghum diversity with that of the African continent. The absence of structure in pearl millet genetic diversity indicated common ancestry and/or important pollen- and seed-mediated gene flow. On the contrary, sorghum varietal and genetic diversity showed geographic patterns, pointing to different ancestry of varieties, limited pollen-mediated gene flow, and geographic patterns in seed-mediated gene flow. Social and ecological processes involved in shaping seed-mediated gene flow are further discussed.

Mots-clés Agrovoc : Sorghum, Cenchrus americanus, production de semences, flux de gènes, génétique des populations, variation génétique, germoplasme, organisation socioéconomique, petite exploitation agricole, distribution géographique, marqueur génétique, variété, variété indigène, ressource génétique végétale, enquête sur les exploitations agricoles, adaptation, diversification, agriculteur, technologie traditionnelle, conservation des ressources génétiques, modèle

Mots-clés géographiques Agrovoc : Kenya, Afrique

Mots-clés complémentaires : SSR

Mots-clés libres : Crop diversity, Farmers' seed systems, Gene flow, Population genetics, Social organization

Classification Agris : F01 - Culture des plantes
F30 - Génétique et amélioration des plantes
F03 - Production et traitement des semences
E51 - Population rurale

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Labeyrie Vanesse, CIRAD-ES-UPR GREEN (FRA) ORCID: 0000-0001-5282-8780
• Deu Monique, CIRAD-BIOS-UMR AGAP (FRA)
• Dussert Yann, CNRS (FRA)
• Rono Bernard, KARI (KEN)
• Lamy Françoise, Université Paris-Sud (FRA)
• Marangu Charles, KARI (KEN)
• Kiambi Dan, ICRISAT (KEN)
• Calatayud Caroline, CIRAD-BIOS-UMR AGAP (FRA)
• Coppens D'Eeckenbrugge Geo, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-1970-0627
• Robert Thierry, Université Paris-Sud (FRA)
• Leclerc Christian, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/581904/)

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