The petD group II intron as a species level marker: utility for tree inference and species identification in the diverse genus Campanula (Campanulaceae)
Authors: Borsch, Thomas; Korotkova, Nadja; Raus, Thomas; Lobin, Wolfram; Löhne, Cornelia
Source: Willdenowia - Annals of the Botanic Garden and Botanical Museum Berlin-Dahlem, Volume 39, Number 1, July 2009 , pp. 7-33(27)
Abstract:Chloroplast introns have a high potential as tools for phylogeny inference and DNA barcoding. This study examines the molecular evolution of the petD group II intron in Campanulaceae based on a sequence data set of 114 ingroup taxa. Three small mutational hotspots had to be excluded from phylogenetic analysis, the two most variable being located in the D4 loop (domain IV). A (GT)4-7 microsatellite in domain II is conserved at species level but of limited phylogenetic use due to unclear homology of individual repeat units. Sequences of the petD group II intron depict Cyphioideae, Lobelioideae and Campanuloideae as major Campanulaceae clades. Core Campanuloideae comprise two major radiations of Campanula species: a Musschia clade (including C. lactiflora) and a Jasione clade. Campanula is highly paraphyletic to a number of smaller genera such as Azorina, Michauxia and Edraianthus. The closed-tubular flowered taxa (Phyteuma and allies) are resolved sister to C. persicifolia. Within core campanuloids petD sequences identify 90 % of the taxon samples included in this study. Considering the ease of amplification and sequencing, and its high information content, the petD intron appears to be a good candidate in a two-tailed approach integrating molecular phylogenetics and species identification in the needed sampling of all core Campanuloideae species.
Document Type: Research Article
Publication date: July 1, 2009
- Willdenowia is a peer-reviewed botanical journal with an international authorship, publishing original research papers in English from the entire fields of plant, algal and fungal taxonomy and systematics, also covering related fields. Its precursor was founded in 1895 as Notizblatt des Königlichen Botanischen Gartens und Museums zu Berlin and 1954 continued with its present title commemorating Carl Ludwig Willdenow, 1765-1812, director of the Botanic Garden, first professor of botany in Berlin and author of the fourth edition of Linne's Species Plantarum. Willdenowia appears in two issues per year in a print edition and an open access online edition.
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