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The complete chloroplast genome of Edgeworthia chrysantha (Thymelaeaceae).

ABSTRACT: Edgeworthia chrysantha is a subtropical plant with significant medicinal value. Herein, we assembled and characterized the complete chloroplast genome of E. chrysantha as genomic resource for future study. The genome consisted a total length of 172,446 bp, comprising of a large single-copy (LSC) region of 85,527 bp, a small single-copy (SSC) region of 2871 bp, separated by two inverted repeat (IR) regions of 42,024 bp each; a total of 139 genes were predicted for the chloroplast genome. Phylogenetic analysis showed that E. chrysantha is placed at the base of the Daphne group of tribe Daphneae, within the family Thymelaeaceae.

SUBMITTER: Lee SY

PROVIDER: S-EPMC7646604 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:BackgroundEdgeworthia chrysantha, a deciduous shrub endemic to China, is known for its high ornamental value, extensive cultivation history, and wide-ranging applications. However, theoretical research on this plant is severely lacking. While its flowering process displays striking color transitions from green (S1) to yellow (S2) and then to white (S3), the scientific exploration of this phenomenon is limited, and the underlying regulatory mechanisms are yet to be elucidated.ResultsCorrelation analysis between phenotypic measurements and pigment content revealed that carotenoids and chlorophyll are the key pigments responsible for the color changes. Metabolomic analysis of carotenoids demonstrated that lutein and β-carotene were present at higher levels in S1, while S2 exhibited increased diversity and quantity of carotenoids compared to other stages. Notably, antheraxanthin, zeaxanthin, lycopene, and α-cryptoxanthin showed significant increases. In S3, apart from the colorless phytoene, other carotenoid metabolites were significantly reduced to extremely low levels. Transcriptomic data indicated that PSY, Z-ISO, crtZ, ZEP, PDS and ZDS are key genes involved in carotenoid biosynthesis and accumulation, while NCED plays a crucial role in carotenoid degradation. SGR was identified as a key gene contributing to the progressive decline in chlorophyll content. Additionally, three transcription factors potentially regulating carotenoid metabolism were also identified.ConclusionsThis study represents the first systematic investigation, spanning from phenotypic to molecular levels, of the color-changing phenomenon in E. chrysantha. The study elucidates the crucial pigments, metabolites, genes, and transcription factors responsible for flower color changes during the flowering process, thereby providing preliminary understanding of the intrinsic regulatory mechanisms. These findings establish a theoretical foundation for the genetic improvement of flower color in E. chrysantha.

Dataset Information

The complete chloroplast genome of Edgeworthia chrysantha (Thymelaeaceae).

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