Patterns and dynamics of genetic diversity in Sorghum

Glaszmann Jean-Christophe. 2012. Patterns and dynamics of genetic diversity in Sorghum. In : International VIPCA conference on 'Molecular Ecology', February 4th-7th, Vienna, Austria. s.l. : s.n., Résumé, 1 p. International VIPCA conference on 'Molecular Ecology', Vienne, Autriche, 4 Février 2012/7 Février 2012.

Note générale : Jean-Christophe Glaszmann est l'expert invité du Cirad

Résumé : Background. Sorghum, the fourth cereal worldwide, was domesticated in Sub-Saharan Africa and is now cultivated on most continents. There are large ex situ collections and many breeding programs. Understanding the patterns of genetic diversity is essential for its conservation and use. Methods. Various projects conducted at CIRAD with INERA and ICRISAT analysed molecular variation at various geographical scales (field, village, region, country, continent), sometimes including temporal variation, using various marker systems. Results. Global assessment of ex situ germplasm collections enabled development of representative samples for association studies. Diversity was highest in the area of origin, with a level of linkage disequilibrium confined to genome segments within the Mb range. Yet certain genes involved in cereal grain quality revealed cases of novel alleles that appeared during geographical radiation, likely selected by the action of the farmers. Studies in Cameroon and Niger villages highlighted the tremendous diversity maintained in traditional agroecosystems, reflecting specific practices of seed exchange in relation to social structure. Conclusion. Crop genetic diversity illustrates intimate association with human populations, their history, practices and needs, to be taken into account for breeding strategies.

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

Auteurs et affiliations

• Glaszmann Jean-Christophe, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-9918-875X

Source : Cirad - Agritrop (https://agritrop.cirad.fr/569892/)

Métriques

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