Molecular support for a basal grade of morphologically peculiar, monotypic genera in the species-rich Vanguerieae alliance (Rubiaceae): its systematic and conservation implications
(English)Manuscript (preprint) (Other academic)
The species-rich coffee family (Rubiaceae) contains 211 monotypic genera, representing 34.5% of the total number of rubiaceous genera. We rigorously assessed the generic status and phylogenetic positions of the enigmatic, monotypic genera, the Seychellean Glionnetia, the Southeast Asian Jackiopsis, and the Chinese Trailliaedoxa, in Rubiaceae using sequence data from four plastid markers (ndhF, rbcL, rps16, and trnT-F). The present study provides molecular support for isolated phylogenetic positions of these genera in the subfamily Ixoroideae, and reveals the presence of a basal grade of morphologically odd, monotypic genera (Crossopteryx, Jackiopsis, Scyphiphora, Trailliaedoxa, and Glionnetia, respectively) in the species-rich Vanguerieae alliance. We consider these phylogenetically isolated genera potential candidates for a high conservation priority, as they appear to be sole representatives of their respective lineages and therefore carry unique genetic information and evolutionary history. The monogeneric tribe Jackieae as defined by Ridsdale is supported.
Conservation, Crossopteryx, Glionnetia, Jackiopsis, Rubiaceae, Scyphiphora, systematics, Trailliaedoxa
Research subject Plant Systematics
IdentifiersURN: urn:nbn:se:su:diva-48800OAI: oai:DiVA.org:su-48800DiVA: diva2:376006
FunderKnut and Alice Wallenberg Foundation
Manuscript part of second authors Thesis in Systematic Botany.2010-12-092010-12-092010-12-14Bibliographically approved