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Molecular phylogenetics and morphological evolution of St. John's wort (Hypericum; Hypericaceae)

Title 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: 25 Jan 2018 08:26
URI: https://eref.uni-bayreuth.de/id/eprint/41464