When Morphology and Biogeography Approximate Nuclear ITS but Conflict with Plastid Phylogeny: Phylogeography of the Lotus dorycnium Species Complex (Leguminosae)статья
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Аннотация:Lotus dorycnium s.l. is a complex of taxa traditionally regarded as members of Dorycnium.It has a wide Mediterranean range, extending in the north to Central and Eastern Europe, and inthe east to the Crimea, the Caucasus, and the Western Caspian region. Molecular phylogenetic data support placement of the L. dorycnium complex in the genus Lotus. The present study investigatedthe phylogeny, phylogeography and morphological variability of the L. dorycnium complex acrossits distribution range to reveal the main trends in genetic and morphological differentiation in this group. The results of the morphological analyses demonstrated some degree of differentiation, with L. d. ssp. herbaceus, ssp. gracilis, and ssp. anatolicus more or less well defined, whereasssp. dorycnium, ssp. germanicus, and ssp. haussknechtii can be hardly distinguished from each otherusing morphology. Analyses of the L. dorycnium complex based on nrITS revealed a tendencytowards a geographic differentiation intoWestern, Eastern, and Turkish groups. Phylogenetic andphylogeographic analyses of the same set of specimens using concatenated plastid markers trnL-F, rps16, and psbA-trnH demonstrated a low resolution between the L. dorycnium complex and L. hirsutus, as well as among the taxa within the L. dorycnium complex, which can be interpreted as evidence of an incomplete lineage sorting or hybridization. The evolutionary processes responsible for incongruencein phylogenetic signals between plastid and nuclear sequences of the morphologically well-defined species L. dorycnium and L. hirsutus were most likely localized in the Eastern Mediterranean. A possibility of rare gene exchange between the L. dorycnium complex and the group of L. graecus is revealed for the first time.