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<p><i>Dracaena</i>, a number of ornamental plant worldwide, is the only basal plant producing dragon’s blood and has significant economic values. Herein, the complete mitochondrial genomes (mitogenome) of <i>Dracaena</i> sp. C6 and <i>Dracaena</i> sp. CZ2 originating from Guangxi were first assembled. They exhibited a mitogenome structure with multi-partite recombination mediated by nine pairs of repeats (R-A, R-B, R-C, R-D, R-E, R-F, R-G, R-H, and R-I). Among them, R-A was present in three copies (two direct repeat sequences and one inverted repeat) and could form a 5,617&#xa0;bp-long repeat fragment R-AG with R-G. Comparative analysis of mitogenomes revealed the occurrence of high-frequency recombination. Collinear analysis revealed the complex origin of long repeats and a faster variation rate than single-copy regions, which further indicated that repeats were hotspot regions of diversity. Based on the RNA-seq reads, the RNA-editing sites in 5 different tissues of C6 were also predicted. The RNA-editing frequency was higher in the leaf base (387 RNA-editing sites) and stem epidermis (411 RNA-editing sites) tissues, which might be related to the production and accumulation of dragon’s blood in <i>Dracaena</i>. In summary, we revealed the basic genetic information and evolutionary mechanism of <i>Dracaena</i> mitogenome, which is important for genetics and evolutionary studies of <i>Dracaena</i> and Asparagales.</p>

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The first mitogenome of Dracaena (Dracaena sp. in Guangxi) reveals complex multi-chromosomal architecture and long repeat sequence-driven evolution

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Zihao Wang,
  • Wei Zheng,
  • Qi Fan,
  • Jiale Guo,
  • Yuxuan Zhang,
  • Guiqi Bi,
  • Peihong Shen,
  • Luodong Huang

摘要

Dracaena, a number of ornamental plant worldwide, is the only basal plant producing dragon’s blood and has significant economic values. Herein, the complete mitochondrial genomes (mitogenome) of Dracaena sp. C6 and Dracaena sp. CZ2 originating from Guangxi were first assembled. They exhibited a mitogenome structure with multi-partite recombination mediated by nine pairs of repeats (R-A, R-B, R-C, R-D, R-E, R-F, R-G, R-H, and R-I). Among them, R-A was present in three copies (two direct repeat sequences and one inverted repeat) and could form a 5,617 bp-long repeat fragment R-AG with R-G. Comparative analysis of mitogenomes revealed the occurrence of high-frequency recombination. Collinear analysis revealed the complex origin of long repeats and a faster variation rate than single-copy regions, which further indicated that repeats were hotspot regions of diversity. Based on the RNA-seq reads, the RNA-editing sites in 5 different tissues of C6 were also predicted. The RNA-editing frequency was higher in the leaf base (387 RNA-editing sites) and stem epidermis (411 RNA-editing sites) tissues, which might be related to the production and accumulation of dragon’s blood in Dracaena. In summary, we revealed the basic genetic information and evolutionary mechanism of Dracaena mitogenome, which is important for genetics and evolutionary studies of Dracaena and Asparagales.