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Background <p>As an important perennial herb in the Iridaceae family, <i>Iris lactea</i> shows strong resistance to saline-alkali, drought, and cold stress, possessing significant ecological, medicinal, and economic value. In this study, we assembled the complete mitochondrial genome of <i>I. lactea</i> using whole-genome sequencing data.</p> Methods and results <p>The assembled genome was 449,819&#xa0;bp in length (GenBank Accession: PX667947) with a GC content of 46.97%. We found 113 simple sequence repeats, with tetranucleotide motifs being the most common (56, or 49.56%). The genome contains 600 dispersed repeats, consisting of 288 palindromic and 312 forward sequences. This mitogenome contains 36 protein-coding genes with a combined length of 32,343&#xa0;bp. Analysis of codon usage revealed a strong preference for arginine, leucine, and serine, whereas methionine and tryptophan were infrequently used. We identified 556 RNA-editing sites, all exhibiting cytosine-to-uracil transitions. Analysis of the sequences inserted into the mitochondrial genome revealed that these chloroplast-derived fragments integrated into non-coding IGS regions and rRNA genes.</p> Conclusions <p>The successful assembly and analysis of the <i>Iris lactea</i> mitogenome significantly enrich the genomic resources of the genus <i>Iris</i>, providing a solid foundation for future research on phylogenetic evolution, germplasm conservation, and genetic improvement of this genus.</p>

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Comparative analysis of mitochondrial genomes of Iris lactea reveals gene transfer and RNA-editing events

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Shuqiong Lu,
  • Chunyu Tian,
  • Yanting Yang,
  • Wenlong Gong,
  • Lemeng Liu,
  • Yumei Feng,
  • Zhiyong Li,
  • Jikuan Chai,
  • Zinian Wu

摘要

Background

As an important perennial herb in the Iridaceae family, Iris lactea shows strong resistance to saline-alkali, drought, and cold stress, possessing significant ecological, medicinal, and economic value. In this study, we assembled the complete mitochondrial genome of I. lactea using whole-genome sequencing data.

Methods and results

The assembled genome was 449,819 bp in length (GenBank Accession: PX667947) with a GC content of 46.97%. We found 113 simple sequence repeats, with tetranucleotide motifs being the most common (56, or 49.56%). The genome contains 600 dispersed repeats, consisting of 288 palindromic and 312 forward sequences. This mitogenome contains 36 protein-coding genes with a combined length of 32,343 bp. Analysis of codon usage revealed a strong preference for arginine, leucine, and serine, whereas methionine and tryptophan were infrequently used. We identified 556 RNA-editing sites, all exhibiting cytosine-to-uracil transitions. Analysis of the sequences inserted into the mitochondrial genome revealed that these chloroplast-derived fragments integrated into non-coding IGS regions and rRNA genes.

Conclusions

The successful assembly and analysis of the Iris lactea mitogenome significantly enrich the genomic resources of the genus Iris, providing a solid foundation for future research on phylogenetic evolution, germplasm conservation, and genetic improvement of this genus.