Phylogenetic positions of Thai members of Gymnema, Gymnemopsis and Sarcolobus (Apocynaceae, Asclepiadoideae, Marsdenieae), and two new Sarcolobus species uncovered by morpho-molecular evidence.
Marsdenia
CpDNA
ITS
Mainland Southeast Asia
Molecular phylogeny
Morphological taxonomy
Journal
Journal of plant research
ISSN: 1618-0860
Titre abrégé: J Plant Res
Pays: Japan
ID NLM: 9887853
Informations de publication
Date de publication:
27 Aug 2024
27 Aug 2024
Historique:
received:
21
04
2024
accepted:
08
07
2024
medline:
27
8
2024
pubmed:
27
8
2024
entrez:
27
8
2024
Statut:
aheadofprint
Résumé
The present study assesses the phylogenetic position of certain Thai members of Gymnema, Gymnemopsis, and Sarcolobus in relation to other known Marsdenieae species. Fifteen accessions newly sequenced from Thailand were added to the dataset of the homologous sequences of 125 accessions of Marsdenieae downloaded from GenBank. In our molecular phylogeny, almost all the delimited major clades and their relationships are largely congruent with those revealed in previous studies. The monophyly of Gymnema (including the former Jasminanthes species) and that of Sarcolobus, as presently circumscribed, are confirmed. The new accessions of these two genera from Thailand are well grouped with the members of their respective genera. Our analyses provide the first molecular evidence for recognition of Gymnemopsis, a small Asian genus that has never been included in the previous phylogenetic studies, as a distinct genus. All elements of Gymnemopsis are retrieved as a well-supported monophyletic group that is strongly supported as sister to Lygisma, another small Asian genus that most closely resembles it in growth habit, color of latex, indumentum on plant parts, corona structure and follicle traits. Combined molecular phylogenetic, morphological and ecological data also support recognition of two new Sarcolobus species from Thailand, Sarcolobus busbanianus sp. nov. and S. flavus sp. nov. Similarities and differences between these new species and their close relative, S. carinatus, are discussed. In addition, this study also reveals the first record for Thailand of Gymnema lacei. Keys to the species of Gymnemopsis (for all members of the genus), Gymnema and Sarcolobus (for Thai members of these genera) are provided.
Identifiants
pubmed: 39190238
doi: 10.1007/s10265-024-01562-z
pii: 10.1007/s10265-024-01562-z
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Thailand Science Research and Innovation Fund Chulalongkorn University
ID : Thailand Science Research and Innovation Fund Chulalongkorn University
Informations de copyright
© 2024. The Author(s) under exclusive licence to The Botanical Society of Japan.
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