Complete chloroplast genome of Austral king fern Todea barbara (L.) Moore (Osmundaceae)

Abstract

In this study, we determined the chloroplast genome sequence of the Austral king fern, Todea barbara (L.) Moore. The plastome of T. barbara is a typical circular form composed of 144,208 bp with two inverted repeats (IRs; 10,442 bp), a large single copy (LSC; 101,059 bp), and a small single copy (SSC; 22,265 bp). The complete sequence comprises 131 genes, namely 85 protein-coding genes, eight ribosomal RNAs, and 38 transfer RNAs. The guanine–cytosine (GC) content of the genome was found to be 39.9%. Additionally, U-to-C RNA editing sites were identified in eight genes: atpE, chlB, clpP, matK, rpl20, rpoB, rpoC1, and rpoC2. Phylogenetic analysis using 85 coding gene sequences revealed that the genera Todea and Osmunda form a clade and that the genus Osmundastrum is a sister genus to both.

Keywords

• todea barbara
• osmundaceae
• chloroplast genome
• rna editing
• austral king fern