The complete chloroplast genome sequence and phylogenetic analysis of Viola grayi (Violaceae)

TL;DR

This paper presents the first complete chloroplast genome of Viola grayi and uses it to explore its evolutionary relationships within the Viola genus.

Contribution

The study provides the first complete chloroplast genome sequence for Viola grayi and clarifies its phylogenetic placement.

Findings

The chloroplast genome of Viola grayi is 158,408 bp in length with typical structural features.

Phylogenetic analysis shows Viola is monophyletic and places V. grayi closely related to V. grypoceras.

The genome serves as a valuable resource for future evolutionary and taxonomic studies in Viola.

Abstract

Viola grayi, a caulescent species in subsection Rostratae, adapted to coastal dunes, with leathery leaves, is here reported with its first sequenced complete chloroplast genome (158,408 bp), comprising a large single-copy (86,662 bp), a small single-copy (17,994 bp), and pair of inverted repeats (26,876 bp each). Phylogenetic analysis of 22 Viola species, based on a 184,817 bp whole-plastome alignment, resolved the genus as monophyletic and placed V. grayi in a clade with V. grypoceras (BP = 100). This plastome provides a valuable genomic resource for future comparative, taxonomic, phylogenetic, and evolutionary studies.

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