Characterization and phylogenetic analysis of the complete mitochondrial genome sequence of , the first representative from the family Ebenaceae.

Plant mitochondrial genomes are a valuable source of genetic information for a better understanding of phylogenetic relationships. However, no mitochondrial genome of any species in Ebenaceae has been reported. In this study, we reported the first mitochondrial genome of an Ebenaceae model plant . The mitogenome was 493,958 bp in length, contained 39 protein-coding genes, 27 transfer RNA genes, and 3 ribosomal RNA genes. The rps2 and rps11 genes were missing in the mt genome, while the rps10 gene was identified. The length of the repetitive sequence in the mt genome was 31 kb, accounting for 6.33%. A clear bias in RNA-editing sites were found in the mt genome. We also detected 28 chloroplast-derived fragments significantly associated with mt genes, indicating intracellular tRNA genes transferred frequently from chloroplasts to mitochondria in . Phylogenetic analysis based on the mt genomes of and 27 other taxa reflected the exact evolutionary and taxonomic status of . Ka/Ks analysis revealed that 95.16% of the protein-coding genes in the mt genome had undergone negative selections. But, the rearrangement of mitochondrial genes has been widely occur among and these observed species. These results will lay the foundation for identifying further evolutionary relationships within Ebenaceae.