Assoumane Aichatou, Zoubeirou Alzouma Mayaki, Rodier-Goud Marguerite, Favreau Bénédicte, Bezançon Gilles, Verhaegen Daniel. 2013. Highlighting the occurrence of tetraploidy in Acacia senegal (L.) Willd. and genetic variation patterns in its natural range revealed by DNA microsatellite markers. Tree Genetics and Genomes, 9 (1) : 93-106.
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Quartile : Q1, Sujet : FORESTRY / Quartile : Q1, Sujet : HORTICULTURE / Quartile : Q3, Sujet : GENETICS & HEREDITY
Résumé : Acacia senegal (L.) Willd. is the main species producing the internationally traded gum arabic. Genetic studies of this species are rare and until now the chromosome number was thought to be diploid (2n02x026). Here, using chromosome number counting, we demonstrate for the first time that tetraploids (2n04x052) also occur in A. senegal. Nuclear and chloroplast microsatellite markers were used to estimate and compare genetic variation within this newly described polyploidy complex in the Sudano- Sahelian region in Africa. Genetic diversity was higher in diploids, suggesting that the formation of tetraploids is recent and that mutation-drift equilibrium has not yet been reached. The two cytotypes do not have the same genetic structure and are genetically differentiated. Among tetraploids, populations are greatly differentiated and do not share the same chlorotypes. Based on these results, we discuss recurrent formation of tetraploids from different diploid progenitors across the distribution range of A. senegal in the Sudano-Sahelian zone.
Mots-clés Agrovoc : Acacia senegal, polyploïdie, diploïdie, tétraploïdie, nombre chromosomique, variation génétique, marqueur génétique, microsatellite, génétique des populations, cytogénétique, chloroplaste, hybridation
Mots-clés géographiques Agrovoc : Afrique, Zone soudano-sahélienne
Mots-clés complémentaires : SSR
Classification Agris : F30 - Génétique et amélioration des plantes
K10 - Production forestière
Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique
Auteurs et affiliations
- Assoumane Aichatou, Université Abdou Moumouni (NER)
- Zoubeirou Alzouma Mayaki, Université Abdou Moumouni (NER)
- Rodier-Goud Marguerite, CIRAD-DG-EVALUATION (FRA)
- Favreau Bénédicte, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0003-2786-9374
- Bezançon Gilles, IRD (NER)
- Verhaegen Daniel, CIRAD-BIOS-UMR AGAP (FRA)
Source : Cirad - Agritrop (https://agritrop.cirad.fr/567501/)
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