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The complete chloroplast genome sequence of Hibiscus coccineus.

ABSTRACT: Hibiscus coccineus is famous for its wide geographical distribution and the showy flowers of scarlet rose mallow. It belongs to the Malvaceae family and has greatly ornamental and ecological value. In this study, high-throughput sequencing and bioinformatics technology were used to assemble the complete chloroplast genome sequence, which will provide more genomic information for studying the genetic diversity and phylogenetic relationship. The full length of chloroplast genome is 160,280 bp, composed of a large single-copy (LSC) region of 89,121 bp, a small single-copy (SSC) region of 18,673 bp, and two inverted repeats (IRs) of 26,243 bp. A total of 113 genes were annotated, including 79 protein-coding genes, 30 tRNA, and four rRNA genes. Phylogenetic tree analysis revealed that the Hibiscus coccineus is closest to Hibiscus mutabilis in the Hibiscus L.

SUBMITTER: Wang Z

PROVIDER: S-EPMC8774145 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Erigeron breviscapus is a famous medicinal plant. However, the limited chloroplast genome information of E. breviscapus, especially for the chloroplast DNA sequence resources, has hindered the study of E. breviscapus chloroplast genome transformation. Here, the complete chloroplast (cp) genome of E. breviscapus was reported. This genome was 152,164bp in length, included 37.2% GC content and was structurally arranged into two 24,699bp inverted repeats (IRs) and two single-copy areas. The sizes of the large single-copy region and the small single-copy region were 84,657 and 18,109bp, respectively. The E. breviscapus cp genome consisted of 127 coding genes, including 83 protein coding genes, 36 transfer RNA (tRNA) genes, and eight ribosomal RNA (rRNA) genes. For those genes, 95 genes were single copy genes and 16 genes were duplicated in two inverted regions with seven tRNAs, four rRNAs, and five protein coding genes. Then, genomic DNA of E. breviscapus was used as a template, and the endogenous 5' and 3' flanking sequences of the trnI gene and trnA gene were selected as homologous recombinant fragments in vector construction and cloned through PCR. The endogenous 5' flanking sequences of the psbA gene and rrn16S gene, the endogenous 3' flanking sequences of the psbA gene, rbcL gene, and rps16 gene and one sequence element from the psbN-psbH chloroplast operon were cloned, and certain chloroplast regulatory elements were identified. Two homologous recombination fragments and all of these elements were constructed into the cloning vector pBluescript SK (+) to yield a series of chloroplast expression vectors, which harbored the reporter gene EGFP and the selectable marker aadA gene. After identification, the chloroplast expression vectors were transformed into Escherichia coli and the function of predicted regulatory elements was confirmed by a spectinomycin resistance test and fluorescence intensity measurement. The results indicated that aadA gene and EGFP gene were efficiently expressed under the regulation of predicted regulatory elements and the chloroplast expression vector had been successfully constructed, thereby providing a solid foundation for establishing subsequent E. breviscapus chloroplast transformation system and genetic improvement of E. breviscapus.

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The complete chloroplast genome sequence of Hibiscus coccineus.

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