Agritrop
Accueil

Niger-wide assessment of in situ sorghum genetic diversity with microsatellite markers

Niger-wide assessment of in situ sorghum genetic diversity with microsatellite markers. Deu Monique, Sagnard Fabrice, Chantereau Jacques, Calatayud Caroline, Herault Damien, Mariac Cédric, Pham Jean Louis, Vigouroux Yves, Kapran Issoufou, Traoré P.S., Mamadou Aïssata, Gérard Bruno, Ndjeunga Jupiter, Bezançon Gilles. 2008. Theoretical and Applied Genetics, 116 (7) : 903-913.
http://dx.doi.org/10.1007/s00122-008-0721-7

[img] Version publiée - Anglais
Accès réservé aux agents Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
document_543875.pdf

Télécharger (597kB)

Article de revue ; Article de revue à facteur d'impact

Résumé : Understanding the geographical, environmental and social patterns of genetic diversity on different spatial scales is key to the sustainable in situ management of genetic resources. However, few surveys have been conducted on crop genetic diversity using exhaustive in situ germplasm collections on a country scale and such data are missing for sorghum in sub-Saharan Africa, its centre of origin. We report here a genetic analysis of 484 sorghum varieties collected in 79 villages evenly distributed across Niger, using 28 microsatellite markers. We found a high level of SSR diversity in Niger. Diversity varied between eastern and western Niger, and allelic richness was lower in the eastern part of the country. Genetic differentiation between botanical races was the first structuring factor (Fst = 0.19), but the geographical distribution and the ethnic group to which farmers belonged were also significantly associated with genetic diversity partitioning. Gene pools are poorly differentiated among climatic zones. The geographical situation of Niger, where typical western African (guinea), central African (caudatum) and eastern Sahelian African (durra) sorghum races converge, explained the high observed genetic diversity and was responsible for the interactions among the ethnic, geographical and botanical structure revealed in our study. After correcting for the structure of botanical races, spatial correlation of genetic diversity was still detected within 100 km, which may hint at limited seed exchanges between farmers. Sorghum domestication history, in relation to the spatial organisation of human societies, is therefore key information for sorghum in situ conservation programs in sub-Saharan Africa. (Résumé d'auteur)

Mots-clés Agrovoc : Sorghum, Collection de matériel génétique, Variation génétique, Microsatellite, Marqueur génétique, Provenance, Distribution géographique, Conservation des ressources

Mots-clés géographiques Agrovoc : Afrique au sud du Sahara, Niger

Mots-clés complémentaires : SSR

Classification Agris : F30 - Génétique et amélioration des plantes
F70 - Taxonomie végétale et phyto-géographie

Axe stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Document en bibliothèque : http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=199842

Localisation du document : CD_BR14891 [(Bibliothèque de Lavalette)]

Auteurs et affiliations

  • Deu Monique, CIRAD-BIOS-UMR DAP (FRA)
  • Sagnard Fabrice, CIRAD-BIOS-UMR DAP (KEN)
  • Chantereau Jacques, CIRAD-BIOS-UPR Agrobiodiversité en savane (FRA)
  • Calatayud Caroline, CIRAD-BIOS-UMR DAP (FRA)
  • Herault Damien
  • Mariac Cédric, IRD (FRA)
  • Pham Jean Louis, IRD (FRA)
  • Vigouroux Yves, IRD (NER)
  • Kapran Issoufou, INRAN (NER)
  • Traoré P.S.
  • Mamadou Aïssata, INRAN (NER)
  • Gérard Bruno, ICRISAT (NER)
  • Ndjeunga Jupiter, ICRISAT (NER)
  • Bezançon Gilles, INRAN (NER)

Source : Cirad - Agritrop

Accès réservé

Voir la notice Voir la notice

[ Page générée et mise en cache le 2016-11-17 ]