Comparative analysis of mitochondrial and chloroplast genomes of Dracaena cambodiana from contrasting island habitats
文献类型： 外文期刊
作者： Liang, Heng 1 ; Sun, Xiuxiu 1 ; Qi, Huasha 1 ; Chen, Jiali 1 ; Wang, Yidan 5 ; Wang, Chunmei 1 ; Liu, Moyang 6 ; Xia, Tengfei 1 ; Feng, Shiling 7 ; Chen, Cheng 6 ; Zheng, Daojun 1 ;
作者机构： 1.Hainan Acad Agr Sci, Inst Trop Hort Res, Haikou, Peoples R China
2.Hainan Acad Agr Sci, Natl Germplasm Resource Chengmai Observat & Expt S, Chengmaia, Peoples R China
3.Hainan Acad Agr Sci, Sanya Inst, Sanya, Peoples R China
4.Hainan Acad Agr Sci, Key Lab Trop Special Econ Plant Innovat & Utilizat, Haikou, Peoples R China
5.Tech Univ Munich, Sch Life Sci, Freising Weihenstephan, Germany
6.Shanghai Jiao Tong Univ, Sch Agr & Biol, Shanghai, Peoples R China
7.Sichuan Agr Univ, Coll Life Sci, Yaan, Sichuan, Peoples R China
关键词： organelle genome; D. cambodiana; comparative genomics; adaptive evolution; genomic resources
期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：4.8； 五年影响因子：5.7 ）
ISSN： 1664-462X
年卷期： 2025 年 16 卷
页码：
收录情况： SCI
摘要： Introduction: Dracaena cambodiana, a vulnerable species widely distributed in tropical and subtropical areas, has been recognized as a model plant for studying island conservation biology due to its fragmented habitat, slow growth, and ecological sensitivity. However, its organelle genome evolution and population divergence across different island environments remain poorly understood. Method: In this study, we de novo assembled and annotated the complete chloroplast (cp) and mitochondrial (mt) genomes of two geographically distinct individuals of D. cambodiana from Hainan Island, China: a coastal area (SY) and a mountainous forest area (DF). Results: Both genomes showed conserved circular structures, but comparative analyses revealed key differences. The chloroplast genomes exhibited intergenic hotspot regions such as trnC-GCA-petN, trnL-UAA-trnF-GAA, and psaI-ycf4, which may serve as potential markers for taxonomy, population genetics, phylogeography and conservation biology of D. cambodiana. In the mitochondrial genomes, three genes (nad1, nad5, and rps11) showed the non-synonymous to synonymous substitution rate ratio (Ka/Ks) >1, indicating potential positive selection linked to environmental stress in the coastal population. Over 580 RNA editing sites were identified in each mitochondrial genome, with minor differences between DF and SY. These results suggest that while organelle genome structures are conserved, subtle molecular variations could potentially be associated with environmental differences between populations, although further investigation is needed to confirm adaptive significance. Conclusion: This study provides foundational genomic resources for understanding the adaptive evolution of D. cambodiana and supports conservation strategies in island ecosystems.
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