Variability of Chloroplast DNA in Oxytropis Section Polyadena (Fabaceae) from Asian Russia: Population Analysis and Phylogenetic Relationships

Nucleotide polymorphism of the intergenic spacers psbA–trnH, trnL–trnF, and trnS–trnG of chloroplast DNA was analyzed in populations of six Oxytropis species of the section Polyadena from Asian Russia. A low level of nucleotide diversity (0.0001–0.0014) was found, except for two O. glandulosa populations (0.0036 and 0.0059). It was noted that the haplotype diversity varies from 0.133 to 0.911. It was established that high interspecific genetic distances and detected species-specific nucleotide substitutions and indels indicate a significant differentiation of the chloroplast genomes of O. muricata, O. microphylla, O. trichophysa, and O. glandulosa (lineages 2, 3). The species O. pseudoglandulosa, O. muricata, O. varlakovii, and O. glandulosa (lineage 1) form a weakly differentiated complex, which is probably caused by their relatively recent divergence.