| Abstract Detail
Systematics Eriksson, Torsten [1], Persson, Nannie [2], Toresen, Ingrid [3], Smedmark, Jenny [3], Andersen, Heidi [3]. Finding the cinquefoil phylogenetic backbone: Resolving the position of moving clades in Potentilla (Rosaceae). Previous phylogenetic analyses have recovered five mostly well supported major clades in Potentilla (the cinquefoils; comprises more than 300 species): the Anserina, Alba, Reptans, Ivesioid, and Argentea clades. Some of these clades –in particular the Reptans clade that includes the type species of Potentilla – were recovered differently in relation to the other clades when using chloroplast or ribosomal DNA sequence data. We studied this “moving clades” effect by analyzing four low copy nuclear markers in addition to ITS and chloroplast data with a set of phylogenetic and multispecies coalescent analyses. A selective taxon removal strategy clearly demonstrated that the presence of two diploid species (or species groups: P. dickinsii and P. fragarioides) were destabilizing the trees, causing the apparent moving of the clades. The effect was gone when these two culprits were removed, resulting in a well resolved backbone phylogeny of Potentilla. Notably this backbone includes the Ivesioid clade, well nested inside Potentilla. A multispecies coalescent analysis including all sampled taxa resolved the same intrageneric relationships, with P. dickinsii and P. fragarioides in unresolved positions.
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1 - University Of Bergen, University Museum, Department Of Natural History, Postboks 7800, Bergen, N-5007 , Norway
2 - University Museum Of Bergen, Postboks 7800, Bergen, 5020, Norway
3 - University of Bergen, University Museum, Department of Natural History, Postboks 7800, Bergen, N-5020, Norway
Keywords:
phylogeny
multispecies coalescent
low copy gene
Rosaceae.
Presentation Type: Oral Paper
Session: SYS2, Systematics II: Rosids part 1 to Asterids part 1
Location: Tucson G/Starr Pass
Date: Wednesday, July 31st, 2019
Time: 8:45 AM
Number: SYS2004
Abstract ID:803
Candidate for Awards:None |
