Genetic Diversity of Oxytropis Species from the Center of the Genus Origin: Insight from Molecular Studies

The genus Oxytropis (Fabaceae) was formed from the ancient species of Astragalus presumably approximately 5.6 Ma ago in Southern Siberia. Our study summarized data on the genetic diversity of 69 populations of 31 Oxytropis species in the center of origin of the genus based on the sequencing of plastid genome markers. Most of the populations (82.6%) are characterized by high gene diversity (0.600-1.000), which indicates a relatively stable state. Phylogenetic relationships between most Oxytropis species remain unresolved. Three genetic complexes and four phyletic lineages have been identified. Some species form weakly differentiated complexes, which is probably caused by their relatively recent divergence and the demography processes, as well as interspecific hybridization and polyploidy characteristic of Oxytropis species.

Automated summary

This study summarized the genetic diversity of Oxytropis species in the center of origin of the genus. Most populations showed high gene diversity, indicating a relatively stable state. Phylogenetic relationships between species were unresolved, but three genetic complexes and four phyletic lineages were identified. Recent divergence, demography processes, interspecific hybridization, and polyploidy likely contribute to the weak differentiation observed in some species.