Abstract
Here, we report the first complete chloroplast genome of Platanthera chlorantha (Orchidaceae: Orchidoideae). The circular genome with the length of 154,260 bp possesses the typical structure consisting of a large single copy region (LSC) of 83,279 bp and a small single copy region (SSC) of 17,759 bp, separated from each other by two copies of inverted repeats (IRs) of 26,611 bp. The plastome encodes 134 genes, of which 88 were protein-coding, eight encoded ribosomal RNA, and 38 transfer RNAs. The overall GC content was 36.74%. The plastome sequence provided here constitutes a valuable resource for analyzing genetic diversity of the Orchidaceae family.
Highlights
Due to their extensive variability and biotic interactions, orchids present a compelling subject for evolutionary studies (Selosse 2014)
With the main focus of researchers being put on the Epidendroideae tribes (142 of 175 orchid species with complete plastomes; NCBI GenBank, as of April 2019), currently only 14 complete chloroplast genomes are available within Orchidoideae tribes (Yu et al 2015; Zhu et al 2016; Roma et al 2018; Oh et al 2019) and only one of those belongs to the member of the same genus Platanthera, namely P. japonica (Dong et al 2018)
Inferring of phylogenetic position of P. chlorantha was based on ML analysis performed with RAxML-NG (Kozlov et al 2019) and multiple sequence alignment of full chloroplast sequences conducted with MAFFT (Katoh and Standley 2013)
Summary
Due to their extensive variability and biotic interactions, orchids present a compelling subject for evolutionary studies (Selosse 2014). KEYWORDS Chloroplast genome; Platanthera chlorantha; orchids; Orchidoideae Chloroplast genomes provide researchers with data invaluable for studying genetic history and phylogeny and were already used to resolve major phylogenetic relationships between orchid subfamilies (Givnish et al 2015).
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