Integrative taxonomy and phylogeny of leafless Vanilla orchids from the South‐West Indian Ocean region reveal two new Malagasy species

Andriamihaja Cathucia, Botomanga Alemao, Misandeau Chantal, Ramarosandratana Ndriana Aro Vonjy H., Grisoni Michel, Da Silva Denis, Pailler Thierry, Jeannoda Vololoniaina, Besse Pascale. 2023. Integrative taxonomy and phylogeny of leafless Vanilla orchids from the South‐West Indian Ocean region reveal two new Malagasy species. Journal of Systematics and Evolution, 61 (1), Celebrating the legacy and life of Professor Wen-Tsai Wang : 80-98.

https://doi.org/10.1111/jse.12858

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

Prévisualisation

Version Online first - Anglais
Sous licence

.
603006.pdf
Télécharger (5MB) | Prévisualisation

Prévisualisation

Version publiée - Anglais
Sous licence

.
603006.pdf
Télécharger (5MB) | Prévisualisation

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/3OFMLH

Résumé : The leafless Vanilla species complex from the South-West Indian Ocean (SWIO) region has long been a taxonomic challenge, due to limited patterns of morphological differentiation and an absence of variation within chloroplast sequences. This complex includes seven known morphospecies: V. madagascariensis, V. bosseri, V. decaryana, and V. perrieri endemic to Madagascar, V. humblotii presumed as endemic to the Comoros Archipelago, but also present in Madagascar, V. roscheri from the East African coast, and V. phalaenopsis endemic to Seychelles. A previous population genetic study using microsatellite markers allowed us to distinguish, in addition to the five recognized Malagasy taxa, two other genetic clusters present in the East of the island. An integrative taxonomy approach was therefore conducted by combining microsatellite and morphological data used in the previous study with new data sets, and by adding ITS sequencing data, to validate the taxonomic level of these Malagasy genetic clusters and unravel phylogenetic relationships between SWIO species. As a result, based on phylogenetic, genotypic and morphological evidence, nine species were discriminated in the SWIO region, including seven in Madagascar, with two new eastern species. The leafless Vanilla group originated and diversified in Madagascar, from an ancestor of African descent, with three subsequent independent colonization events from Madagascar to the other territories of SWIO within the two main lineages (white versus yellow flower species). The new Malagasy species, V. allorgeae Andriamihaja & Pailler sp. nov., and V. atsinananensis Andriamihaja & Pailler sp. nov., are described and a new identification key is proposed.

Mots-clés Agrovoc : morphologie végétale, génotype, taxonomie, phylogénie, espèce nouvelle, Vanilla

Mots-clés géographiques Agrovoc : Madagascar, Mayotte, Seychelles, Comores

Mots-clés complémentaires : Vanilla allorgeae, Vanilla atsinananensis, Vanilla madagascariensis, Vanilla bosseri, Vanilla decaryana, Vanilla perrieri, Vanilla humblotii, Vanilla roscheri, Vanilla phalaenopsis

Mots-clés libres : ITS, Madagascar, Microsatellites, Morphology, Phylogeography, Species delimitation, Systematic

Classification Agris : F70 - Taxonomie végétale et phytogéographie
F50 - Anatomie et morphologie des plantes

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations