Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread
Khaya (Meliaceae) is a widespread genus of trees distributed from the tropical forests of Africa to Madagascar and the Comoros. Khaya species are very close morphologically and some contain considerable phenotypic and ecological diversity, raising the question of their delimitation: this is the case...
| Autores principales: | , , , , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Wiley
2022
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| Acceso en línea: | https://hdl.handle.net/10568/119493 |
| _version_ | 1855515051383848960 |
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| author | Bouka, Gaël U.D. Doumenge, Charles Ekué, Marius Daïnou, Kasso Florence, Jacques Degen, Bernd Loumeto, Jean Joël McKey, Doyl Hardy, Olivier J. |
| author_browse | Bouka, Gaël U.D. Daïnou, Kasso Degen, Bernd Doumenge, Charles Ekué, Marius Florence, Jacques Hardy, Olivier J. Loumeto, Jean Joël McKey, Doyl |
| author_facet | Bouka, Gaël U.D. Doumenge, Charles Ekué, Marius Daïnou, Kasso Florence, Jacques Degen, Bernd Loumeto, Jean Joël McKey, Doyl Hardy, Olivier J. |
| author_sort | Bouka, Gaël U.D. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Khaya (Meliaceae) is a widespread genus of trees distributed from the tropical forests of Africa to Madagascar and the Comoros. Khaya species are very close morphologically and some contain considerable phenotypic and ecological diversity, raising the question of their delimitation: this is the case of Khaya anthotheca s.l. (sensu lato, including K. nyasica), which is often lumped with K. grandifoliola and K. ivorensis. We tested species delimitation within K. anthotheca by combining population‐genetic and morphological data. First, a visual inspection of over a thousand specimens suggested the existence of five morphogroups. Second, after genotyping 498 samples at 71 nuclear SNPs, Bayesian clustering analyses (STRUCTURE) first identified five genetic clusters (K1–K5), while further analyses subdivided K5 into two clusters. The six genetic clusters obtained are distributed in parapatry or allopatry from West Africa to East Africa, except for cluster K4, which is in sympatry with K3 in Central Africa. The partitioning of genetic clusters is also largely congruent with the morphogroups identified. The morphological differentiation of these clusters was confirmed by statistical analyses of 27 leaf characters. The clear‐cut genetic differentiation between clusters, with few admixed genotypes even in contact zones, argues for the recognition of distinct species following the biological species concept. Our analyses highlight that the current taxonomic treatment of Khaya underestimates by one‐half the total number of species. We identify two new species, circumscribe K. anthotheca and support the rehabilitation at the rank of species of three taxa considered to be synonyms of K. anthotheca (K. agboensis, K. euryphylla, K. nyasica). These results illustrate the strength of combining population‐genetic and morphological data to delineate an African rainforest tree species complex. |
| format | Journal Article |
| id | CGSpace119493 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1194932025-12-08T09:54:28Z Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread Bouka, Gaël U.D. Doumenge, Charles Ekué, Marius Daïnou, Kasso Florence, Jacques Degen, Bernd Loumeto, Jean Joël McKey, Doyl Hardy, Olivier J. plant morphology species diversity genetic variation genetic markers rainforests morfología vegetal diversidad de especies variación genética Khaya (Meliaceae) is a widespread genus of trees distributed from the tropical forests of Africa to Madagascar and the Comoros. Khaya species are very close morphologically and some contain considerable phenotypic and ecological diversity, raising the question of their delimitation: this is the case of Khaya anthotheca s.l. (sensu lato, including K. nyasica), which is often lumped with K. grandifoliola and K. ivorensis. We tested species delimitation within K. anthotheca by combining population‐genetic and morphological data. First, a visual inspection of over a thousand specimens suggested the existence of five morphogroups. Second, after genotyping 498 samples at 71 nuclear SNPs, Bayesian clustering analyses (STRUCTURE) first identified five genetic clusters (K1–K5), while further analyses subdivided K5 into two clusters. The six genetic clusters obtained are distributed in parapatry or allopatry from West Africa to East Africa, except for cluster K4, which is in sympatry with K3 in Central Africa. The partitioning of genetic clusters is also largely congruent with the morphogroups identified. The morphological differentiation of these clusters was confirmed by statistical analyses of 27 leaf characters. The clear‐cut genetic differentiation between clusters, with few admixed genotypes even in contact zones, argues for the recognition of distinct species following the biological species concept. Our analyses highlight that the current taxonomic treatment of Khaya underestimates by one‐half the total number of species. We identify two new species, circumscribe K. anthotheca and support the rehabilitation at the rank of species of three taxa considered to be synonyms of K. anthotheca (K. agboensis, K. euryphylla, K. nyasica). These results illustrate the strength of combining population‐genetic and morphological data to delineate an African rainforest tree species complex. 2022-08 2022-05-10T07:56:37Z 2022-05-10T07:56:37Z Journal Article https://hdl.handle.net/10568/119493 en Open Access application/pdf Wiley Bouka, G.U.D.; Doumenge, C.; Ekué, M.R.M.; Daïnou, K.; Florence, J.; Degen, B.; Loumeto, J.J.; McKey, D.; Hardy, O.J. (2022) Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread. Taxon, Online first paper (02 May 2022). 19 p. ISSN: 0040-0262 |
| spellingShingle | plant morphology species diversity genetic variation genetic markers rainforests morfología vegetal diversidad de especies variación genética Bouka, Gaël U.D. Doumenge, Charles Ekué, Marius Daïnou, Kasso Florence, Jacques Degen, Bernd Loumeto, Jean Joël McKey, Doyl Hardy, Olivier J. Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread |
| title | Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread |
| title_full | Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread |
| title_fullStr | Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread |
| title_full_unstemmed | Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread |
| title_short | Khaya revisited: Genetic markers and morphological analysis reveal six species in the widespread |
| title_sort | khaya revisited genetic markers and morphological analysis reveal six species in the widespread |
| topic | plant morphology species diversity genetic variation genetic markers rainforests morfología vegetal diversidad de especies variación genética |
| url | https://hdl.handle.net/10568/119493 |
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