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Article (Scientific journals)
Evolution in African tropical trees displaying ploidy-habitat association: The genus Afzelia (Leguminosae)
Donkpegan, Segbedji  ; Doucet, Jean-Louis  ; Migliore, Jérémy et al.
2016 • In Molecular Phylogenetics and Evolution
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Keywords :
Afzelia; Leguminosae (Detarioideae); Diversification; Morphometry; Niche evolution; Molecular phylogeny; Polyploidy
Abstract :
[en] Polyploidy has rarely been documented in rain forest trees but it has recently been found in African species of the genus Afzelia (Leguminosae), which is composed of four tetraploid rain forest species and two diploid dry forest species. The genus Afzelia thus provides an opportunity to examine how and when polyploidy and habitat shift occurred in Africa, and whether they are associated. In this study, we combined three plastid markers (psbA, trnL, ndhF), two nuclear markers (ribosomal ITS and the single-copy PEPC E7 gene), plastomes (obtained by High Throughput Sequencing) and morphological traits, with an extensive taxonomic and geographic sampling to explore the evolutionary history of Afzelia. Both nuclear DNA and morphological vegetative characters separated diploid from tetraploid lineages. Although the two African diploid species were well differentiated genetically and morphologically, the relationships among the tetraploid species were not resolved. In contrast to the nuclear markers, plastid markers revealed that one of the diploid species forms a well-supported clade with the tetraploids, suggesting historical hybridisation, possibly in relation with genome duplication (polyploidization) and habitat shift from dry to rain forests. Molecular dating based on fossil-anchored gene phylogenies indicates that extant Afzelia started diverging c. 14.5 or 20 Ma while extant tetraploid species started diverging c. 7.0 or 9.4 Ma according to plastid and nuclear DNA, respectively. Additional studies of tropical polyploid plants are needed to assess whether the ploidy-habitat association observed in African Afzelia would reflect a role of polyploidization in niche divergence in the tropics.
Disciplines :
Genetics & genetic processes
Author, co-author :
Donkpegan, Segbedji ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Doucet, Jean-Louis ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Migliore, Jérémy;  Université Libre de Bruxelles - ULB > Biologie des organismes > EBE
Duminil, Jérôme;  Institut de Recherche pour le Développement > UMR-DIADE
Daïnou, Kasso ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Pineiro, Rosalia;  Royal Botanic Gardens > Conservation > Jodrell Laboratory
Wieringa, Jan;  National Herbarium of The Netherlands > Naturalis Biodiversity Centre
Champluvier, Dominique;  Botanical Garden of Meise
Hardy, Olivier;  Université Libre de Bruxelles - ULB > Biologie des organismes > EBE
Language :
English
Title :
Evolution in African tropical trees displaying ploidy-habitat association: The genus Afzelia (Leguminosae)
Publication date :
November 2016
Journal title :
Molecular Phylogenetics and Evolution
ISSN :
1055-7903
eISSN :
1095-9513
Publisher :
Academic Press, San Diego, United States - California
Peer reviewed :
Peer Reviewed verified by ORBi

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