# The complete chloroplast genome of an Antarctic moss, Ptychostomum pseudotriquetrum (Hedw.) J.R.Spence & H.P.Ramsay (Bryaceae), and phylogenetic analysis

## TL;DR

This paper reports the complete chloroplast genome of an Antarctic moss and its phylogenetic placement within the Bryaceae family.

## Contribution

The study provides a new chloroplast genome sequence for Ptychostomum pseudotriquetrum and its phylogenetic analysis within Bryopsida.

## Key findings

- The chloroplast genome of P. pseudotriquetrum is 123,172 bp long and contains 82 protein-coding genes.
- Phylogenetic analysis places P. pseudotriquetrum in the Bryaceae clade, diverging from Anomobryum gemmigerum and Bryum argenteum.
- The study enriches chloroplast genome resources for the Bryaceae family and Ptychostomum genus.

## Abstract

Ptychostomum pseudotriquetrum (Hedw.) J.R.Spence & H.P.Ramsay (Bryaceae) is a bipolar and one of the most widespread species within Antarctica, exhibiting a ubiquitous presence along the Antarctic Peninsula. This study analyzed its chloroplast genome, which is 123,172 bp in length, and consists of 82 protein-coding genes, four ribosomal RNA genes, and 31 transfer RNA genes. A phylogenetic tree, constructed using 58 conserved orthologous protein-coding genes from 19 complete chloroplast genomes of the class Bryopsida, confirmed that P. pseudotriquetrum belongs to clade Bryaceae. Within this clade, P. pseudotriquetrum diverged from the clade containing Anomobryum gemmigerum and Bryum argenteum. This study contributes to enriching chloroplast genome resources for the family Bryaceae and the genus Ptychostomum. Such advancement could facilitate future genetic investigations aimed at conserving and exploiting Antarctic bryophytes.