A novel phylogeny of the Gelidiales (Rhodophyta) based on five genes including the nuclear CesA, with descriptions of Orthogonacladia gen. nov. and Orthogonacladiaceae fam. nov

• Published in: Molecular phylogenetics and evolution 2016-08, Vol.101, p.359-372
• Main Authors: Boo, Ga Hun, Le Gall, Line, Miller, Kathy Ann, Freshwater, D. Wilson, Wernberg, Thomas, Terada, Ryuta, Yoon, Kyung Ju, Boo, Sung Min
• Format: Article
• Language: English
• Subjects: Acanthopeltis; Aphanta; Biochemistry, Molecular Biology; Biodiversity; Cell Nucleus - genetics; CesA; Gelidiales; Gelidium; Gelidium madagascariense; Genetic Markers; Life Sciences; Likelihood Functions; Molecular biology; Multigene analyses; Orthogonacladia; Orthogonacladiaceae; Phylogeny; Pterocladia; Rhodophyta; Rhodophyta - anatomy & histology; Rhodophyta - classification; Rhodophyta - genetics; Systematics, Phylogenetics and taxonomy; Vegetal Biology
• ISSN: 1055-7903; 1095-9513
• DOI: 10.1016/j.ympev.2016.05.018

[Display omitted] •A comprehensive molecular phylogeny of 107 species in ten genera of the Gelidiales is provided for the first time.•Nuclear CesA is an informative molecular marker for the phylogeny of the Gelidiales.•Multi-gene phylogenies (including 5 markers) improve resolution of phylogenetic relationships in the Gelidiales.•A new genus and a new family are described: Orthogonacladia gen. nov. and Orthogonacladiaceae fam. nov. Although the Gelidiales are economically important marine red algae producing agar and agarose, the phylogeny of this order remains poorly resolved. The present study provides a molecular phylogeny based on a novel marker, nuclear-encoded CesA, plus plastid-encoded psaA, psbA, rbcL, and mitochondria-encoded cox1 from subsets of 107 species from all ten genera within the Gelidiales. Analyses of individual and combined datasets support the monophyly of three currently recognized families, and reveal a new clade. On the basis of these results, the new family Orthogonacladiaceae is described to accommodate Aphanta and a new genus Orthogonacladia that includes species previously classified as Gelidium madagascariense and Pterocladia rectangularis. Acanthopeltis is merged with Gelidium, which has nomenclatural priority. Nuclear-encoded CesA was found to be useful for improving the resolution of phylogenetic relationships within the Gelidiales and is likely to be valuable for the inference of phylogenetic relationship among other red algal taxa.