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Generic affiliations of Canthium species placed under Pyrostria group B sensu Bridson (Vanguerieae, Rubiaceae) inferred from morphology and molecular data.

ABSTRACT: BACKGROUND:Pyrostria sensu lato (s.l.) is regarded as one of the polyphyletic group within Vanguerieae formerly comprising of Pyrostria sensu stricto (s.s.), Pyrostria group A and Pyrostria group B delineated by the number of locules and geographical occurrence. Recent molecular phylogenetic studies within the genus have narrowed its circumscription that resulted in the merging of Pyrostria group A and Pyrostria s.s. Although some species of Pyrostria group B were already transferred to Pyrostria s.s. and Psydrax based on morphology, other representatives of the group remain unsettled. RESULTS:Bayesian and parsimony analysis of the combined ITS (nrDNA) and trnL-F (cpDNA) datasets showed a well-supported clade of the whole Vanguerieae containing four Philippine endemic representatives of Pyrostria group B. The placement of Canthium oligophlebium, Canthium obovatifolium and Canthium ramosii within Pyrostria s.s. (PP = 0.99; BS = 85%) is robustly supported likewise the affiliation of C. gynochthodes with Psydrax (PP = 0.94; BS = 85%). Morphological features shared by our species with Pyrostria s.s. and Psydrax further supports our molecular data. CONCLUSION:Our study supports the earlier hypothesis that Canthium oligophlebium, C. obovatifolium and C. ramosii should be placed under Pyrostria s.s. except for C. gynochthodes that grouped with Psydrax. Four new combinations are proposed in this study. The generic affiliations of other species of Pyrostria group B should be reinvestigated towards a more natural classfication in Vanguerieae.

SUBMITTER: Alejandro GJD

PROVIDER: S-EPMC5432757 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature

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Generic affiliations of Canthium species placed under Pyrostria group B sensu Bridson (Vanguerieae, Rubiaceae) inferred from morphology and molecular data.

Alejandro Grecebio Jonathan D GJD Magdaleno Carizza Marie M CMM Pacia Joseph Alvin T JAT Paraguison Lyn D LD Quiogue Kim Karlo C KKC Wong Annie Eliza D AED Yayen Krysten Marie R KMR Arriola Axel H AH

Botanical studies 20140911 1

<h4>Background</h4>Pyrostria sensu lato (s.l.) is regarded as one of the polyphyletic group within Vanguerieae formerly comprising of Pyrostria sensu stricto (s.s.), Pyrostria group A and Pyrostria group B delineated by the number of locules and geographical occurrence. Recent molecular phylogenetic studies within the genus have narrowed its circumscription that resulted in the merging of Pyrostria group A and Pyrostria s.s. Although some species of Pyrostria group B were already transferred to ...[more]

PMID: 28510947

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Project description:Background and aimsThe tribe Danaideae (Rubiaceae) is almost exclusively endemic to the Western Indian Ocean Region (WIOR), and encompasses the genera Danais, Payera and Schismatoclada that occur in humid, sub-humid and mountain and mountain bio climate zones. Much of the species diversity is endemic to restricted, remote and/or mountainous areas of Madagascar and recent field work on the island indicates substantial unknown diversity of the Danaideae. Furthermore, the monophyly of the Malagasy genera Payera and Schismatoclada has been questioned in previous work, species delimitations and phylogenetic relationships within the genera are poorly understood, and the distribution and evolution of gross morphological features have not been assessed.MethodsWe conducted morphological investigations, and produced robust phylogenies of Danaideae based on nuclear and plastid sequence data from 193 terminals. Ample plant material has been newly collected in the WIOR for the purpose of the present study, including potentially new species unknown to science. We performed Bayesian non-clock and relaxed-clock analyses employing three alternative clock models of a dataset with a dense sample of taxa from the entire geographical ranges of Danaideae. Based on the results, we discuss species diversity and distribution, relationships, and morphology in Danaideae.Key resultsOur results demonstrate the monophyly of Danaideae, its three genera and 42 species. Nine species are resolved as non-monophyletic. Many geographically distinct but morphologically heterogeneous lineages were identified, and morphological features traditionally considered diagnostic of subgroups of the genera, used for example in species identification keys, are not clade-specific.ConclusionsOur results demonstrate that Madagascar contains ample previously undocumented morphological and species diversity of Danaideae. Our novel approach to molecular phylogenetic analyses as a precursor to taxonomic revisions provides numerous benefits for the latter. There are tentative indications of parallel northward diversification in Payera and Schismatoclada on Madagascar, and of geographical phylogenetic clustering despite the anemochorous condition of Danaideae.

Dataset Information

Generic affiliations of Canthium species placed under Pyrostria group B sensu Bridson (Vanguerieae, Rubiaceae) inferred from morphology and molecular data.

Publications

Generic affiliations of Canthium species placed under Pyrostria group B sensu Bridson (Vanguerieae, Rubiaceae) inferred from morphology and molecular data.

Similar Datasets

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