Abstract
Asparagus cochinchinensis is a traditional Chinese medicinal plant. The chloroplast (cp) genome study on A. cochinchinensis is poorly understood. In this research, we collected the data from the cp genome assembly and gene annotation of A. cochinchinensis, followed by further comparative analysis with six species in the genus Asparagus. The cp genome of A. cochinchinensis showed a circular quadripartite structure in the size of 157,095 bp, comprising a large single-copy (LSC), a small single-copy (SSC), and two inverted repeat (IR) regions. A total of 137 genes were annotated, consisting of 86 protein-coding genes, 8 ribosomal RNAs, 38 transfer RNAs, and 5 pseudo-genes. Forty scattered repetitive sequences and 247 simple sequence repeats loci were marked out. In addition, A/T-ending codons were shown to have a basis in the codon analysis. A cp genome comparative analysis revealed that a similar gene composition was detected in the IR and LSC/SSC regions with Asparagus species. Based on the complete cp genome sequence in Asparagaceae, the result showed that A. cochinchinensis was closely related to A. racemosus by phylogenetic analysis. Therefore, our study providing A. cochinchinensis genomic resources could effectively contribute to the phylogenetic analysis and molecular identification of the genus Asparagus.
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