Kilian, Norbert and Galbany-Casals, Merce and Sommerer, Ronny and Oberprieler, Christoph and Smissen, Rob and Miller, Antony and Rabe, Katharina (2017) Systematics of Libinhania, a new endemic genus of Gnaphalieae (Asteraceae) from the Socotra archipelago (Yemen), inferred from plastid, low-copy nuclear and nuclear ribosomal DNA loci. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY, 183 (3). pp. 373-412. ISSN 0024-4074, 1095-8339
Full text not available from this repository. (Request a copy)Abstract
The Socotra archipelago off the Horn of Africa shelters morphologically diverse endemic species of Asteraceae tribe Gnaphalieae, eight species placed in Helichrysum and five newly discovered. We reconstructed their phylogenetic relationships, analysing nuclear ribosomal DNA (nrDNA) internal transcribed spacer and external transcribed spacer, three plastid DNA and two low-copy nuclear DNA loci with Bayesian inference and maximum parsimony. The plastid DNA and nrDNA trees resolve the endemic helichrysoids as a monophyletic group and agree in that they are not members of Helichrysum or even part of the Helichrysum-Anaphalis-Pseudognaphalium clade, but disagree as to their sister group. In the nrDNA tree, they are nested in the Filago-Leontopodium-Antennaria-Gamochaeta (FLAG) clade, whereas in the plastid DNA tree they are sister to Syncarpha mucronata. The endemic helichrysoids possess two divergent copies of each of the nDNA low-copy markers, similar to those previously found for the FLAG clade. This suggests an ancient allopolyploid origin, with the putative ancestors among the ancestors of Gnaphalium or relatives and of S. mucronata or relatives. The reconstruction of ancestral states of morphological characters suggested hypotheses on the origin and evolution of the morphological diversity of the endemic helichrysoids. We conclude a taxonomic treatment with a key to, and descriptions for, the 13 species accommodated in a new genus, Libinhania.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MEDITERRANEAN HELICHRYSUM ASTERACEAE; SOUTHERN ARABIAN PENINSULA; LONG-DISTANCE DISPERSAL; CAPE-VERDE ISLANDS; PHYLOGENETIC-RELATIONSHIPS; CHLOROPLAST SEQUENCES; GENERIC DELIMITATION; MOLECULAR PHYLOGENY; CARDUEAE COMPOSITAE; INSULAR WOODINESS; allopolyploidy; ancestral state reconstruction; Compositae; Helichrysum; morphology; phylogenetics; reticulate evolution; taxonomy |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Group Plant Systematics and Evolution (Prof. Dr. Christoph Oberprieler) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:00 |
| Last Modified: | 12 Feb 2019 10:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/255 |
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