at Google ScholarTitle data
Nürk, Nicolai M. ; Madriñán, Santiago ; Carine, Mark A. ; Chase, Mark W. ; Blattner, Frank R.:
Molecular phylogenetics and morphological evolution of St. John's wort (Hypericum; Hypericaceae).
In: Molecular Phylogenetics and Evolution.
Vol. 66
(2013)
Issue 1
.
- pp. 1-16.
ISSN 1055-7903
DOI: https://doi.org/10.1016/j.ympev.2012.08.022
Abstract in another language
Phylogenetic hypotheses for the large cosmopolitan genus Hypericum (St. John’s wort) have previously been based on morphology, and molecular studies have thus far included only a few species. In this study, we used 360 sequences of the internal transcribed spacer (ITS) region of nuclear ribosomal DNA (nrDNA) for 206 species representing Hypericum (incl. Triadenum and Thornea) and three other genera of Hypericaceae to generate an explicit phylogenetic hypothesis for the genus using parsimony and model-based methods. The results indicate that the small genus Triadenum is nested in a clade within Hypericum containing most of the New World species. Sister to Hypericum is Thornea from Central America. Within Hypericum, three large clades and two smaller grades were found; these are based on their general morphology, especially characters used previously in taxonomy of the genus. Relative to the most recent classification, around 60% of the sections of Hypericum were monophyletic. We used a Bayesian approach to reconstruct ancestral states of selected morphological characters, which resulted in recognition of characters that support major clades within the genus and a revised interpretation of morphological evolution in Hypericum. The shrubby habit represents the plesiomorphic state from which herbs evolved several times. Arborescent species have radiated convergently in high-elevation habitats in tropical Africa and South America.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Additional notes: | BAYCEER139317 |
| Keywords: | Character evolution; Hypericaceae; Internal transcribed spacer (ITS); Phylogeny; Thornea; Triadenum |
| Institutions of the University: | Research Institutions Research Institutions > Research Centres Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Systematics Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science |
| Date Deposited: | 25 Jan 2018 08:26 |
| Last Modified: | 18 Sep 2019 09:57 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/41464 |