Complete chloroplast genomes of four Triumfetta species obtained from herbarium specimens: comparative analysis and identification of a synapomorphic inversion

Description

Yan and colleagues sequenced the complete chloroplast genomes, the small DNA circles that run photosynthesis, of four Triumfetta species, a mallow genus with several medicinal members. DNA came from pressed herbarium specimens, proving old collections can still yield full genomes. The 2026 analysis compared the four newcomers with the ten previously published genomes for the genus, hunting for structural quirks and variable spots useful as identification barcodes.

Each genome kept the standard four-part layout and held 112 distinct genes, with lengths around 160 thousand DNA letters. Three species shared a distinctive six-gene inversion, a flipped stretch of DNA found in no other branch, marking them as close relatives. Seven highly variable locations emerged as candidate barcodes for telling species apart. Family trees built from the genomes split the genus into two major groups with strong geographic patterning, aiding naming disputes and conservation work.

Catalog record

Source: https://europepmc.org/articles/PMC13493957