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Background <p><i>Bletilla striata</i>, a species within the genus <i>Bletilla</i>, holds significant medicinal and ornamental value. For further exploring the organelle of <i>B. striata</i>, the first complete mitochondrial genome (mitogenome) was assembled and annotated.</p> Results <p>The <i>B. striata</i> mitogenome exhibits a unique multi-chromosomal structure, spanning a total size of 746,435&#xa0;bp, and contains 63 annotated genes, including 34 protein-coding genes (PCGs), 26 tRNA genes, and 3 rRNA genes. A total of 376 repetitive sequences were identified, with six pairs of repeats potentially meditating homologous recombination. Additionally, we detected 77 homologous segments in the chloroplast and mitochondrial genomes, among which 60 complete genes were further annotated. Phylogenetic analysis showed <i>B. striata</i> in close relation to the <i>Apostasia</i> genus, underscoring its evolutionary position within Orchidaceae.</p> Conclusion <p>These findings shed light on the mitogenome structure and genetic characteristics of <i>B. striata</i>, offering a foundational framework for future explorations into its evolutionary dynamics.</p>

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Comparative analysis of multi-chromosomal mitochondrial genome of Bletilla striata: homologous recombination mediated by repetitive sequences

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月17日

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  • Zhongchun Xiao,
  • Le Wang,
  • Chao Zhang,
  • Minzhi Ma,
  • Guidong Miao,
  • Yingjuan Wang,
  • Pei Zhang,
  • Yuan Wang,
  • Lifei Zou,
  • Li Zhou,
  • Hongping Deng,
  • Xue Liu

摘要

Background

Bletilla striata, a species within the genus Bletilla, holds significant medicinal and ornamental value. For further exploring the organelle of B. striata, the first complete mitochondrial genome (mitogenome) was assembled and annotated.

Results

The B. striata mitogenome exhibits a unique multi-chromosomal structure, spanning a total size of 746,435 bp, and contains 63 annotated genes, including 34 protein-coding genes (PCGs), 26 tRNA genes, and 3 rRNA genes. A total of 376 repetitive sequences were identified, with six pairs of repeats potentially meditating homologous recombination. Additionally, we detected 77 homologous segments in the chloroplast and mitochondrial genomes, among which 60 complete genes were further annotated. Phylogenetic analysis showed B. striata in close relation to the Apostasia genus, underscoring its evolutionary position within Orchidaceae.

Conclusion

These findings shed light on the mitogenome structure and genetic characteristics of B. striata, offering a foundational framework for future explorations into its evolutionary dynamics.