The first mitogenome of Dracaena (Dracaena sp. in Guangxi) reveals complex multi-chromosomal architecture and long repeat sequence-driven evolution
文献类型： 外文期刊
第一作者： Wang, Zihao
作者： Wang, Zihao;Zheng, Wei;Fan, Qi;Guo, Jiale;Zhang, Yuxuan;Shen, Peihong;Huang, Luodong;Bi, Guiqi
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期刊名称：TREE GENETICS & GENOMES （ 影响因子：1.6； 五年影响因子：2.0 ）
ISSN： 1614-2942
年卷期： 2025 年 21 卷 3 期
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收录情况： SCI
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.
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