Assembly and analysis of the complete mitochondrial genome of Forsythia suspensa (Thunb.) Vahl
- PMID: 37996801
- PMCID: PMC10666317
- DOI: 10.1186/s12864-023-09821-4
Assembly and analysis of the complete mitochondrial genome of Forsythia suspensa (Thunb.) Vahl
Abstract
Background: Forsythia suspensa (Thunb.) Vahl is a valuable ornamental and medicinal plant. Although the nuclear and chloroplast genomes of F. suspensa have been published, its complete mitochondrial genome sequence has yet to be reported. In this study, the genomic DNA of F. suspensa yellowish leaf material was extracted, sequenced by using a mixture of Illumina Novaseq6000 short reads and Oxford Nanopore PromethION long reads, and the sequencing data were assembled and annotated.
Result: The F. suspensa mitochondrial genome was obtained in the length of 535,692 bp with a circular structure, and the GC content was 44.90%. The genome contains 60 genes, including 36 protein-coding genes, 21 tRNA genes, and three rRNA genes. We further analyzed RNA editing of the protein-coding genes, relative synonymous codon usage, and sequence repeats based on the genomic data. There were 25 homologous sequences between F. suspensa mitochondria and chloroplast genome, which involved the transfer of 8 mitochondrial genes, and 9473 homologous sequences between mitochondrial and nuclear genomes. Analysis of the nucleic acid substitution rate, nucleic acid diversity, and collinearity of protein-coding genes of the F. suspensa mitochondrial genome revealed that the majority of genes may have undergone purifying selection, exhibiting a slower rate of evolution and a relatively conserved structure. Analysis of the phylogenetic relationships among different species revealed that F. suspensa was most closely related to Olea europaea subsp. Europaea.
Conclusion: In this study, we sequenced, assembled, and annotated a high-quality F. suspensa mitochondrial genome. The results of this study will enrich the mitochondrial genome data of Forsythia, lay a foundation for the phylogenetic development of Forsythia, and promote the evolutionary analysis of Oleaceae species.
Keywords: Bioinformatics analysis; Forsythia suspensa (Thunb.) Vahl; Mitochondrial genome; Phylogenetic evolution.
© 2023. The Author(s).
Conflict of interest statement
The authors declare no competing interests.
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