Characterization of Complete Chloroplast Genome Sequences of Three Tropical Liana Dalbergia Species and Comparative Analysis of Phylogenetic and Structure Variations in Dalbergia Genus
文献类型： 外文期刊
作者： Wang, Jun 1 ; Zheng, Shaoying 2 ; Sun, Xianglai 3 ; Wang, Lulu 1 ; Ding, Xupo 2 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Peoples R China
2.Guangxi Minzu Univ, Sch Marine Sci & Biotechnol, Guangxi Key Lab Polysaccharide Mat & Modificat, Nanning 530008, Peoples R China
3.Natl Pk Hainan Trop Rainforest Management Bur, Haikou 570203, Peoples R China
关键词：
期刊名称：HORTICULTURAE （ 影响因子：3.0； 五年影响因子：3.2 ）
ISSN：
年卷期： 2025 年 11 卷 7 期
页码：
收录情况： SCI
摘要： The Dalbergia genus, a morphologically diverse group within the Fabaceae family, encompasses species of significant value in furniture production and medicinal and aromatic applications. The taxonomy of Dalbergia has relied on morphological traits, chloroplast (cp) DNA fragments, and cp genomic data. However, genomic resources for tropical liana species within this genus remain scarce. In this study, we assembled and analyzed the cp genomes of 3 liana species-Dalbergia peishaensis, D. pinnata, and D. tsoi-and compared them with those of 26 other Dalbergia species to explore their cp genome characteristics and evolutionary patterns. We employed a combination of traditional cp genome analysis and methods adapted from plant whole-genome sequencing. Phylogenetic analysis revealed that D. peishaensis has a close relationship with D. cultrata, forming a recently diverged clade, whereas D. tsoi and D. pinnata are positioned within a basal clade of the Dalbergia genus, suggesting an earlier divergence. The Dalbergia cp genomes exhibit considerable variation in size, with evidence of pseudogenization, gene loss, and duplication observed in the three liana species. Notably, the infA gene, previously reported as absent in the chloroplast genomes of Dalbergia species, was identified in the cp genomes of these three liana Dalbergia species. A total of 4533 simple sequence repeats (SSRs) were identified, providing valuable insights into cp genome evolution and facilitating future population genetics studies, particularly when combined with the high structural variation observed in the genus through whole-genome analysis methods. Additionally, seven highly divergent regions were identified as potential DNA barcode hotspots. This study enhances the genomic characterization of liana Dalbergia species and offers a robust framework for future plant cp genome analyses by integrating methodologies originally developed for whole-genome studies.
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