Comprehensive Analysis of the Complete Chloroplast Genome of Cinnamomum daphnoides (Lauraceae), An Endangered Island Endemic Plant.

Autor: Zhu H; Zhejiang Academy of Forestry, Hangzhou, 310023, China. 1107401987@qq.com., Li H; Zhejiang Academy of Forestry, Hangzhou, 310023, China.
Jazyk: angličtina
Zdroj: Molecular biotechnology [Mol Biotechnol] 2024 Dec; Vol. 66 (12), pp. 3514-3525. Date of Electronic Publication: 2023 Nov 07.
DOI: 10.1007/s12033-023-00950-5
Abstrakt: Cinnamomum daphnoides (Siebold & Zucc 1846) is a rare and endangered island species with a unique Sino-Japanese distribution pattern. However, inormation regarding the species' chloroplast (cp) genome, structural features, and the phylogenetic relationship is still lacking. We utilized high-throughput sequencing technology to assemble and annotate the first cp genome of C. daphnoides (GenBank OR654104), followed by genomic characterization and phylogenetic analysis to fill the gaps in this species' cp genome. Our analysis showed that the cp genome has a quadripartite structure spanning 152,765 bp with a GC content of 39.15%. The genome encodes 126 genes, which include 36 tRNA genes, 8 rRNA genes, and 82 mRNA genes. Specifically, 44 genes are related to photosynthesis, 59 are associated with self-replication, six are other genes, and four have unknown functionality. The Codon usage bias in the genome exhibits a preference for A/U bases. We identified 29 interspaced repeat sequences that belonging to three types of repeat sequences. A total of 217 cpSSR loci were detected with single nucleotide repeats (59.91%) being the most frequent loci, mainly composed of A/T repeats. Our selection pressure analysis revealed that the ycf2 gene experienced strong positive selection (Ka/Ks = 1.81, P > 0.844). Further, we identified three highly variable fragments (psbM, psbT, and ycf1) that can be utilized as specific DNA barcoding markers for species definition and population genetic studies. We conducted boundary analysis, which showed that the structure and gene sequence of the two species were highly conserved. Finally, our phylogenetic analysis supports that C. daphnoides is close to C. cassia in the Cinnamomum genes, indicating that the two species share a common ancestry. Overall, providing genomic information on C. daphnoides will be beneficial for the conservation and utilization of endangered plant genetic resources. It will also serve as a reference for the identification of species and the phylogenetic analysis of Cinnamomum. This information will be useful in future research.
Competing Interests: Declarations Conflict of interest No potential conflict of interest was reported by the authors. Ethical Approval This article does not contain any studies with animals performed by any of the authors. The plant materials used in this study were collected from the arboretum of Zhejiang Academy of Forestry, and the collection process was in accordance with the regulations of the academy and relevant local laws and regulations.
(© 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
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