The complete chloroplast genome of two Syzygium (Myrtaceae) species and comparative analysis with other related species

Syzygium , a vital genus under Myrtaceae, is aesthetically pleasing and resistant and is used for urban greenery. However, with intensive research in recent years, an increasing number of Syzygium plants have been explored for their medicinal value. Analysing the Syzygium chloroplast (cp) genome can help assess its phylogenetic relationships and provide a theoretical basis for the development and application of Syzygium plants. In this study, we first sequenced the complete cp genomes of Syzygium grijsii and Syzygium rehderianum to investigate their phylogenetic relationships in Myrtaceae. In the copy region and reverse repeat region, 129 genes were detected, including 84 protein-coding genes, 37 tRNA genes, and eight rRNA genes. Preference analysis showed that the eight Syzygium species preferred codons ending in A/U and contained abundant repetitive sequences and SSR sites. The ycf1 , rpoC2 , matK and ndhB genes had the most RNA editable sites and more genes with Ka/Ks 0.015, showing a high level of nucleotide diversity. Phylogenetic analysis showed that Syzygium grijsii was closely related to Syzygium jambos , and S. rehderianum was close to Plinia aureana . The cp genome and phylogeny of S. grijsii and S. rehderianum provide a theoretical basis for Syzygium species identification and exploitation.