Phylogenetic relationships of Atocion and Viscaria (Sileneae, Caryophyllaceae) inferred from chloroplast, nuclear ribosomal, and low-copy gene DNA sequences

• Atocion and Viscaria are two of seven small genera recognised in the   tribe Sileneae on the basis of molecular phylogenies. The aim of the   present study is to infer phylogenetic relationships among their  subordinate taxa, using chloroplast (rps16 intron,psbE-petG spacer   region) and nuclear (ITS and the RNA polymerase gene family) DNA   sequences. Relative dating was used to discriminate among intralineage   and interlineage processes that cause incongruence among different   gene-tree topologies. Atocion asterias is demonstrated to belong to   Viscaria, which contains three species: V vulgaris (incl. V   atropurpurea), V alpina, and V asterias. Infraspecific differentiation   of V alpina is not supported by the sequence data. The traditional   sectional delimitation of Atocion taxa within Silene is not supported   phylogenetically, and Silene tatarinowii as well as S. hoefftiana do   not belong to Atocion, as classified previously. Atocion contains six   species: A. armeria, A. compactum, A. lerchenfeldianum, A. reuterianum,   A. rupestre, and A. scythicinum (not included in our study). With this   circumscription, Atocion and Viscaria, respectively, form monophyletic   groups in the cpDNA, ITS, RPD2a and RPD2b trees, but not in the RPA2   tree, where such relationships were possibly distorted by ancient   hybridisation. Hybridisation with subsequent chloroplast capture is   likely to have taken place in the evolutionary history of A. compactum.   Three novel nomenclatural combinations are made: Atocion reuterianum,  A. scythicinum and Viscaria asterias.

Ämnesord

NATURVETENSKAP  -- Biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Nyckelord

BEAST

Lychnis sect. Viscaria

RPA2

RPD2a

RPD2b

Silene sect. Compactae

Silene sect. Rupifraga

Biology

Biologi

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