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Analysis of genetic diversity and population structure of sesame accessions from Africa and Asia as major centers of its cultivation

Dossa Komivi, Wei Xin, Zhang Yanxin, Fonceka Daniel, Yang Wenjuan, Diouf Diégane, Liao Boshou, Cissé Ndiaga, Zhang Xiurong. 2016. Analysis of genetic diversity and population structure of sesame accessions from Africa and Asia as major centers of its cultivation. Genes, 7 (4):14, 13 p.

Journal article ; Article de revue à facteur d'impact Revue en libre accès total
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Quartile : Q2, Sujet : GENETICS & HEREDITY

Abstract : Sesame is an important oil crop widely cultivated in Africa and Asia. Understanding the genetic diversity of accessions from these continents is critical to designing breeding methods and for additional collection of sesame germplasm. To determine the genetic diversity in relation to geographical regions, 96 sesame accessions collected from 22 countries distributed over six geographic regions in Africa and Asia were genotyped using 33 polymorphic SSR markers. Large genetic variability was found within the germplasm collection. The total number of alleles was 137, averaging 4.15 alleles per locus. The accessions from Asia displayed more diversity than those from Africa. Accessions from Southern Asia (SAs), Eastern Asia (EAs), and Western Africa (WAf) were highly diversified, while those from Western Asia (WAs), Northern Africa (NAf), and Southeastern Africa (SAf) had the lowest diversity. The analysis of molecular variance revealed that more than 44% of the genetic variance was due to diversity among geographic regions. Five subpopulations, including three in Asia and two in Africa, were cross-identified through phylogenetic, PCA, and STRUCTURE analyses. Most accessions clustered in the same population based on their geographical origins. Our results provide technical guidance for efficient management of sesame genetic resources in breeding programs and further collection of sesame germplasm from these different regions. (Résumé d'auteur)

Mots-clés géographiques Agrovoc : Asie, Afrique

Classification Agris : F30 - Plant genetics and breeding

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

Auteurs et affiliations

  • Dossa Komivi, CAAS (CHN)
  • Wei Xin, CAAS (CHN)
  • Zhang Yanxin, CAAS (CHN)
  • Fonceka Daniel, CIRAD-BIOS-UMR AGAP (SEN)
  • Yang Wenjuan, CAAS (CHN)
  • Diouf Diégane, UCAD (SEN)
  • Liao Boshou, CAAS (CHN)
  • Cissé Ndiaga, CERAAS (SEN)
  • Zhang Xiurong, CAAS (CHN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/580661/)

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