Article (Périodiques scientifiques)
Species delimitation and phylogeography of African tree populations of the genus Parkia (Fabaceae)
Ahossou, O. D.; Daïnou, Kasso; Janssens, S. B. et al.
2020In Tree Genetics and Genomes, 16 (5)
Peer reviewed vérifié par ORBi
 

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Mots-clés :
Clinal morphological variation; Complex of (sub)species; Cryptic species; Genetic clusters; Speciation; Taxonomy
Résumé :
[en] In the pantropical mimosoid legume genus Parkia, taxonomic classification has remained controversial in Africa due to clinal phenotypic variations. Three species (P. biglobosa, P. bicolor, and P. filicoidea) are currently recognized, ranging from West to East Africa, with partially overlapping ranges across different floristic regions. However, additional taxa (species or varieties) have been suggested by different authors. To assess species boundaries of African Parkia and phylogeographic patterns within species, we genotyped 889 individuals using 10 microsatellite markers and compared our results with existing morphological descriptions. Bayesian genetic clustering confirmed the species boundaries assessed from morphological traits and did not reveal introgression but identified genetic discontinuities within each species. Six moderately differentiated genetic clusters were recovered in P. biglobosa (pairwise FST: 0.05–0.19), while P. bicolor and P. filicoidea, each, displayed four well-differentiated clusters (FST: 0.18–0.41 and 0.11–0.34, respectively). Within each species, genetic clusters occurred in parapatry. Parkia biglobosa clusters were congruent with the longitudinal clinal variation in leaflets sizes but 26% of individuals presented admixed genotypes. Genetic clusters in P. bicolor and P. filicoidea followed environmental gradients as well as phytogeographic subdivisions. They were also largely congruent with morphological discontinuities described in previous taxonomic studies and < 10% individuals showed admixed genotypes. We conclude that only one species (P. biglobosa) should be considered in the Guineo-Sudanian savanna. However, P. bicolor and P. filicoidea might each represent a complex of (sub)species. Thus, the hypotheses of cryptic species within P. bicolor and P. filicoidea should be further investigated by testing reproductive barriers.
Disciplines :
Génétique & processus génétiques
Auteur, co-auteur :
Ahossou, O. D.;  Evolutionary Biology and Ecology – CP 160/12, Faculté des Sciences, Université Libre de Bruxelles, Av. F. Roosevelt 50, Brussels, 1050, Belgium
Daïnou, Kasso  ;  Université de Liège - ULiège > Département GxABT > Laboratoire de Foresterie des régions trop. et subtropicales
Janssens, S. B.;  Botanical Garden Meise, Nieuwelaan 38, Meise, 1860, Belgium
Triest, L.;  Laboratory of Plant Biology and Nature Management, Faculty of Sciences, Vrije Universiteit Brussel, Pleinlaan 2, Brussels, 1050, Belgium
Hardy, O. J.;  Evolutionary Biology and Ecology – CP 160/12, Faculté des Sciences, Université Libre de Bruxelles, Av. F. Roosevelt 50, Brussels, 1050, Belgium
Langue du document :
Anglais
Titre :
Species delimitation and phylogeography of African tree populations of the genus Parkia (Fabaceae)
Date de publication/diffusion :
2020
Titre du périodique :
Tree Genetics and Genomes
ISSN :
1614-2942
eISSN :
1614-2950
Maison d'édition :
Springer
Volume/Tome :
16
Fascicule/Saison :
5
Peer reviewed :
Peer reviewed vérifié par ORBi
Organisme subsidiant :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
IFS - International Foundation for Science [SE]
Disponible sur ORBi :
depuis le 09 décembre 2020

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