Poster Presentation Society for Molecular Biology and Evolution Conference 2016

Revisiting the plastid phylogenomics of Pinaceae with two complete plastomes of Pseudolarix and Tsuga (#591)

Edi Sudianto 1 2 3 , Chung-Shien Wu 3 , Ching-Ping Lin 3 , Shu-Miaw Chaw 1 3
  1. Biodiversity Program, Taiwan International Graduate Program, Taipei, Taiwan
  2. Department of Life Science, National Taiwan Normal University, Taipei, Taiwan
  3. Biodiversity Research Center, Academia Sinica, Taipei, Taiwan

Phylogeny of the ten Pinaceous genera has long been contentious. Plastid genomes (plastomes) provide an opportunity to resolve this problem because they contain rich evolutionary information. To comprehend the plastid phylogenomics of all ten Pinaceous genera, we sequenced the plastomes of two previously unavailable genera, Pseudolarix amabilis (122,234 bp) and Tsuga chinensis (120,859 bp). Both plastomes share similar gene repertoire and order. Here for the first time we report a unique insertion of tandem repeats in accD of T. chinensis. From the 65 plastid protein-coding genes common to all Pinaceous genera, we re-examined the phylogenetic relationship among all Pinaceous genera. Our phylogenetic analyses resulted in an identical tree topology, with the five genera of the Abietoideae subfamily constituting a monophyletic clade separate from the other three subfamilies: Pinoideae, Piceoideae, and Laricoideae. The five genera of Abietoideae were separated into two sister clades consisting of (1) Cedrus alone and (2) two sister subclades of Pseudolarix-Tsuga and Abies-Keteleeria, with the former uniquely losing the gene psaM and the latter specifically excluding the 3’ psbA from the residual inverted repeat.