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Evolutionary drivers of species delimitation in African polyploid complex trees genus Afzelia: insights from molecular phylogeny
Donkpegan, Segbedji; Duminil, Jérôme; Daïnou, Kasso et al.
201552TH INTERNATIONAL WORKSHOP FOR ASSOCIATION FOR TROPICAL BIOLOGY AND CONSERVATION- ATBC 2015
 

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Abstract :
[en] Background:. Molecular markers can improve our knowledge of the rain forest biodiversity, especially to decipher species evolution and delimitation within genera. In this study, we investigated evolutionary relationships among the Afzelia genus, an important tropical timber taxon in Africa.. Method: We used nuclear and chloroplast DNA associated with partial plastome sequences data to infer phylogenetic relationships among the six broadly distributed species of the genus: A. africana and A. quanzensis (savannah species), A. bipindensis, A. bella, A. pachyloba and A. parviflora (forest species). Using microsatellite markers (SSR), we also applied a clustering analysis (STRUCTURE) to verify whether the current taxonomic species delimitation matches the biological species concept. Result and discussion: Our SSR data showed for the first time that savannah species were diploid while forest species were tetraploid. Nuclear DNA separates diploid and tetraploid species in two distinct cladesbut plastid markers show that one diploid species forms a well-supported clade with the tetraploids, suggesting historical hybridization, possibly in relation with genome duplication (polyploidization) and habitat shift from dry to rain forests. The genetic structure observed with SSR confirms the taxonomic delimitation of the two diploid species and one tetraploid species (A. pachyloba). It also suggests the existence of a single Afzelia forest species in West Africa, and the presence of two distint species within the A. bipindensis taxon, with potential hybridization with A. bella. Conclusion: The evolutionary history of the genus Afzelia is complex and the potential link between polyploidization and habitat shift needs further investigation. Our data also show that species delimitation must be revisited, at least among three of the four rain forest species.
Disciplines :
Genetics & genetic processes
Author, co-author :
Donkpegan, Segbedji ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Duminil, Jérôme;  Bioversity International
Daïnou, Kasso  ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Hardy, Olivier;  Université Libre de Bruxelles - ULB > Biologie des Organismes > Evolution Biologique et Ecologie
Doucet, Jean-Louis ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Language :
English
Title :
Evolutionary drivers of species delimitation in African polyploid complex trees genus Afzelia: insights from molecular phylogeny
Publication date :
13 July 2015
Number of pages :
segbedji
Event name :
52TH INTERNATIONAL WORKSHOP FOR ASSOCIATION FOR TROPICAL BIOLOGY AND CONSERVATION- ATBC 2015
Event place :
Honolulu (Hawaii), United States
Event date :
Du 12 au 16 juillet 2015
Audience :
International
Available on ORBi :
since 23 May 2016

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