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Background   Rhododendron delavayi  Franch. var. delavayi is a wild ornamental plant species in Guizhou Province, China. The lack of its plastid genome information seriously hinders the further application and conservation of the valuable resource.    Methods  The complete plastid genome of  R. delavayi  was assembled from long sequence reads. The genome was then characterized, and compared with those of other photosynthetic Ericaceae species.    Results  The plastid genome of  R. delavayi  has a typical quadripartite structure, and a length of 202,169 bp. It contains a large number of repeat sequences and shows preference for codon usage. The comparative analysis revealed the irregular recombination of gene sets, including rearrangement and inversion, in the large single copy region. The extreme expansion of the inverted repeat region shortened the small single copy, and expanded the full length of the genome. In addition, consistent with traditional taxonomy,  R. delavayi  with nine other species of the same family were clustered into Ericaceae based on the homologous protein-coding sequences of the plastid genomes. Thus, the long-read assembly of the plastid genome of  R. delavayi  would provide basic information for the further study of the evolution, genetic diversity, and conservation of  R. delavayi  and its relatives.

peerj

Long-reads reveal that <i>Rhododendron delavayi</i> plastid genome contains extensive repeat sequences, and recombination exists among plastid genomes of photosynthetic Ericaceae

Long-reads reveal that Rhododendron delavayi plastid genome contains extensive repeat sequences, and recombination exists among plastid genomes of photosynthetic Ericaceae