Complete Chloroplast Genome and Phylogenomic Analysis of <i>Davallia trichomanoides</i> (Polypodiaceae).

ABSTRACT: Background/Objectives: Chloroplast genomes (plastomes) are valuable for fern systematics, yet the epiphytic lineages have remained underexplored. Methods: The Davallia trichomanoides plastome was de novo assembled from Illumina data and annotated. Results: The plastome measures 154,217 bp with a GC content of 40.82% and contains 115 genes. Comparative analysis reveals two inverted repeat (IR) size classes (~24.0-24.6 kb vs. ~27.4-27.5 kb) and lineage-specific shifts at the IR junctions. For instance, the ndhF gene remains in the small single copy (SSC) region in D. trichomanoides and Drynaria acuminata, but it crosses into the IRb region in other species. We observed nucleotide diversity hotspots in the large single copy (LSC) and SSC region

SUBMITTER: Wang Y 

PROVIDER: S-EPMC12652714 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature