Complete chloroplast genomes of endemic Astragalus and Oxytropis species from Uzbekistan

<ns3:p> Chloroplast genomes provide important insights into plant phylogeny, genome evolution, and molecular marker development. In this study, we sequenced, assembled, and analyzed the complete chloroplast genomes of two endemic species from Uzbekistan, <ns3:italic>Astragalus nuratensis</ns3:italic> and <ns3:italic>Oxytropis pseudorosea.</ns3:italic> Genome skimming generated high-quality paired-end reads, enabling the recovery of complete plastomes with mean sequencing depths of 638× and 1,725×, respectively. The chloroplast genomes were 122,316 bp in <ns3:italic>A. nuratensis</ns3:italic> and 122,708 bp in <ns3:italic>O. pseudorosea.</ns3:italic> Both genomes encoded 110 unique genes, including 76 protein-coding genes, 30 transfer RNA genes, and 4 ribosomal RNA genes. Consistent with members of the inverted repeat–lacking clade of Fabaceae, both species lacked the typical inverted repeat regions, resulting in a single-copy genome structure. Phylogenetic analysis based on 119 complete chloroplast genomes resolved major lineages within <ns3:italic>Astragalus</ns3:italic> and related genera with strong support. <ns3:italic>Astragalus nuratensis</ns3:italic> was placed within the Phaca clade, while <ns3:italic>Oxytropis pseudorosea</ns3:italic> formed part of a distinct Oxytropis lineage. These results provide new genomic resources for understanding evolutionary relationships and plastome evolution in Central Asian legumes. </ns3:p>

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