title: Supermatrix data highlight the phylogenetic relationships of photosynthetic stramenopiles.
abstract: Molecular data had consistently recovered monophyletic classes for the heterokont algae, however, the relationships among the classes had remained only partially resolved. Furthermore, earlier studies did not include representatives from all taxonomic classes. We used a five-gene (nuclear encoded SSU rRNA; plastid encoded rbcL, psaA, psbA, psbC) analysis with a subset of 89 taxa representing all 16 heterokont classes to infer a phylogenetic tree. There were three major clades. The Aurearenophyceae, Chrysomerophyceae, Phaeophyceae, Phaeothamniophyceae, Raphidophyceae, Schizocladiophyceae and Xanthophyceae formed the SI clade. The Chrysophyceae, Eustigmatophyceae, Pinguiophyceae, Synchromophyceae and Synurophyceae formed the SII clade. The Bacillariophyceae, Bolidophyceae, Dictyochophyceae and Pelagophyceae formed the SIII clade. These three clades were also found in a ten-gene analysis. The approximately unbiased test rejected alternative hypotheses that forced each class into either of the other two clades. Morphological and biochemical data were not available for all 89 taxa, however, existing data were consistent with the molecular phylogenetic tree, especially for the SIII clade.
authors: Bigelow Laboratory for Ocean Sciences, West Boothbay Harbor, ME 04575, USA.
authors: Eun Chan
authors: EC
authors: Yang
authors: Ga Hun
authors: GH
authors: Boo
authors: Hee Jeong
authors: HJ
authors: Kim
authors: Sung Mi
authors: SM
authors: Cho
authors: Sung Min
authors: SM
authors: Boo
authors: Robert A
authors: RA
authors: Andersen
authors: Hwan Su
authors: HS
authors: Yoon
mesh_terms: D002467:Cell Nucleus / Q000235:genetics; D061125:Genes, Chloroplast; D050259:Genes, Mitochondrial; D008928:Mitochondria / Q000235:genetics; D010788:Photosynthesis; D010802:Phylogeny; D018087:Plastids / Q000235:genetics; D012335:RNA, Ribosomal / Q000235:genetics; D012270:Ribosomes / Q000235:genetics; D012273:Ribulose-Bisphosphate Carboxylase / Q000235:genetics; D058009:Stramenopiles / Q000145:classification* / Q000235:genetics
chemical_list: D012335:RNA, Ribosomal; C101625:RbcL protein, plastid; D012273:Ribulose-Bisphosphate Carboxylase