Farmers seed systems and management practices determine pearl millet genetic diversity patterns in semiarid regions of India

Vom Brocke Kirsten, Christinck Anja, Weltzien Eva, Presterl T., Geiger Hartwig H.. 2003. Farmers seed systems and management practices determine pearl millet genetic diversity patterns in semiarid regions of India. Crop Science, 43 (5) : 1680-1689.

Résumé : Pearl millet [Pennisetum glaucum (L.) R. Br.] landraces provide nutritional quality and security under the harsh environmental conditions of Rajasthan, India. Using amplified fragment length polymorphism (AFLP), this study investigated pearl millet genetic diversity patterns and related the results to farmers' local knowledge and seed systems. Thirty-nine cultivars were assessed: 14 farmer landraces from western Rajasthan, 13 farmer landraces from eastern Rajasthan, and 12 control cultivars. Shannons' information index for western (H = 0.34) and eastern (H = 0.32) Rajasthan landraces was up to 14% higher than in composite-based improved cultivan. Analysis of molecular variance (AMOVA) revealed that variation within landrace populations was much higher than between regional samples. In the west, intra-village variation was higher than inter-village variation. In the east, variation between landrace groups bearing a specific name was higher than infra-group variation. Gene flow, inferred from genetic distances between populations, was used as an indicator for seed exchange between farmers. In western Rajasthan, seed exchange appears to be especially dynamic, as gene flow was greater than N,m = 25 among most of its populations. Farmers' knowledge of local cultivan and seed systems was, for the most part, supported by the AFLP analysis. These results are relevant for in situ maintenance and breeding strategies with a view to improving traditional cultivan, specifically performance and yielding stability.

Mots-clés Agrovoc : Cenchrus americanus, semence, variété, gestion, agriculteur

Mots-clés géographiques Agrovoc : Rajasthan, Inde

Classification Agris : F03 - Production et traitement des semences
F30 - Génétique et amélioration des plantes

Auteurs et affiliations

• Vom Brocke Kirsten, CIRAD-CA-CALIM (BFA)
• Christinck Anja, Institute for Social Sciences of the Agricultural Sector (DEU)
• Weltzien Eva, ICRISAT (MLI)
• Presterl T., Institut für Pflanzenzüchtung, Saatgutforschung und Populationsgenetik (DEU)
• Geiger Hartwig H., Institut für Pflanzenzüchtung, Saatgutforschung und Populationsgenetik (DEU)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/526836/)

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