Highlighting the occurrence of tetraploidy in Acacia senegal (L.) Willd. and genetic variation patterns in its natural range revealed by DNA microsatellite markers

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 (2 n  = 2 x  = 26). Here, using chromosome number counting, we demonstrate for the first time that te...

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Bibliographic Details
Published in:Tree genetics & genomes 2013-02, Vol.9 (1), p.93-106
Main Authors: Assoumane, A., Zoubeirou, A. M., Rodier-Goud, M., Favreau, B., Bezançon, G., Verhaegen, D.
Format: Article
Language:English
Subjects:
Acacia senegal
Biodiversity and Ecology
Biomedical and Life Sciences
Biotechnology
Chloroplasts
Chromosome number
Chromosomes
Diploids
Enumeration
Environmental Sciences
Forestry
Genetic diversity
Genetic markers
Genetic structure
Genomes
Leaves
Life Sciences
Microsatellites
Original Paper
Plant Breeding/Biotechnology
Plant Genetics and Genomics
Polyploidy
Rare species
Stem cells
Tetraploidy
Tree Biology
Trees
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Summary: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 (2 n  = 2 x  = 26). Here, using chromosome number counting, we demonstrate for the first time that tetraploids (2 n  = 4 x  = 52) 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.
ISSN:1614-2942
1614-2950
DOI:10.1007/s11295-012-0537-0