Abstract
Based on nucleotide polymorphism of cpDNA intergenic spacers psbA-trnH, trnL-trnF, and trnS-trnG, we studied the genetic diversity and population structure of a mountain species Oxytropis vasskovskyi Jurtz., endemic to East Siberia. The populations were characterized by medium and high haplotype (0.524–1.000) and low nucleotide (0.0003–0.0008) diversity. Variability distribution analysis showed a moderate level of diff erentiation; the interpopulation component accounted for about 44% of the total genetic variation in O. vasskovskyi. We observed demographic expansion for three of fi ve O. vasskovskyi populations. The haplotypes of the fi ve studied populations form a single complex in the genealogical network, which is probably due to their common origin, relatively recent divergence and incomplete lineage sorting, as well as the existing gene exchange between populations. Thus, in four of the fi ve studied populations, a low level of nucleotide diversity and the absence of nucleotide substitutions were determined, which indicates the need to use certain measures to protect all known habitats, conduct regular monitoring of their state and search for new locations of the species.
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