# The Complete Chloroplast Genome of Camellia tianeensis (Camellia L.) and Phylogenetic Relationships with Other Plants of the Genus Camellia

## TL;DR

This study sequenced the chloroplast genome of Camellia tianeensis and found it is closely related to other golden-yellow petal camellias.

## Contribution

The paper provides the first complete chloroplast genome of C. tianeensis and clarifies its phylogenetic position within the genus Camellia.

## Key findings

- The chloroplast genome of C. tianeensis is 156,865 bp long with a typical quadripartite structure.
- Phylogenetic analysis shows C. tianeensis is closely related to C. huana within sect. Chrysantha.
- The genome contains 164 genes and 69 SSRs, mostly mononucleotide repeats.

## Abstract

Background/Objectives: Species within section Chrysantha represent the only camellias known to produce golden-yellow petals. The primary objectives of this study were to characterize the chloroplast genome structure of Camellia tianeensis and to elucidate its phylogenetic position with sect. Chrysantha. Methods: The complete chloroplast genome of C. tianeensis was sequenced, assembled, and annotated. Phylogenetic inference was conducted using maximum likelihood and Bayesian methods based on complete chloroplast genomic sequences. Results: The chloroplast genome of C. tianeensis is 156,865 bp in length and exhibits a typical quadripartite structure consisting of a large single-copy (LSC) region (86,579 bp), a small single-copy (SSC) region (18,236 bp), and two inverted repeat (IR) regions (26,025 bp each). The genome encodes 164 genes, including 111 protein-coding genes, 45 tRNAs, and 8 rRNA genes. The overall GC content was 37.32%, with regional values of 35.33% (LSC), 30.59% (SSC), and 42.99% (IRs). Sixty-nine simple sequence repeats (SSRs) were identified, predominantly mononucleotide repeats, Thirty-eight dispersed repeats were categorized into three types (forward, reverse, and palindromic), with no complement repeats detected. Phylogenetic analysis strongly supported that C. tianeensis is a member within sect. Chrysantha. Conclusions: C. tianeensis is phylogenetically closely related to C. huana, forming a well-supported clade. This study enhances the molecular research available for sect. Chrysantha and provides a genomic foundation for future phylogenetic and taxonomic studies in this group.