The complete chloroplast genomes of two Sinalliaria species and species delimitation (Brassicaceae)

Sinalliaria is a new small genus of Brassicaceae with only two species (S. grandifolia and S. limprichtiana) endemic in eastern China. Because of their limited distribution, identifying the species and sources of S. grandifolia and S. limprichtiana are important for biodiversity conservation and ecological preservation. The chloroplast genome sizes of Sinalliaria grandifolia and S. limprichtiana were 154,113 and 154,060 bp in length. Both genomes contain a large single copy region of 83 k bp and a small single copy region of 17 k bp, which were separated by a pair of 26,253 bp (S. grandifolia) and 26,275 bp (S. limprichtiana) inverted repeat regions. They both contained 129 genes, including 85 protein-coding genes (78 PCG species), seven ribosomal RNA genes (four rRNA species) and 37 tRNA genes (30 tRNA species). Phylogenetic analyses of five chloroplast genome sequences clustered two Sinalliaria grandifolia individuals and three S. limprichtiana individuals into two highly supported monophyletic groups. These complete chloroplast genomes laid a good foundation for biodiversity conservation, population genomics, molecular and ecological studies of Sinalliaria.