title: Resolving the phylogenetic relationship between Chlamydomonas sp. UWO 241 and Chlamydomonas raudensis sag 49.72 (Chlorophyceae) with nuclear and plastid DNA sequences.
abstract: The Antarctic psychrophilic green alga Chlamy-domonas sp. UWO 241 is an emerging model for studying microbial adaptation to polar environments. However, little is known about its evolutionary history and its phylogenetic relationship with other chlamydomonadalean algae is equivocal. Here, we attempt to clarify the phylogenetic position of UWO 241, specifically with respect to Chlamydomonas rau-densis SAG 49.72. Contrary to a previous report, we show that UWO 241 is a distinct species from SAG 49.72. Our phylogenetic analyses of nuclear and plastid DNA sequences reveal that UWO 241 represents a unique lineage within the Moewusinia clade (sensu Nakada) of the Chlamydomonadales (Chlorophyceae, Chlorophyta), closely affiliated to the marine species Chlamydomonas parkeae SAG 24.89.
authors.affiliation: Department of Biology, University of Western Ontario, London, Ontario, Canada, N6A 5B7.
authors.forename: Marc
authors.initials: M
authors.lastname: Possmayer
authors.affiliation: Department of Biochemistry, University of Western Ontario, London, Ontario, Canada, N6A 5C1.
authors.forename: Rajesh K
authors.initials: RK
authors.lastname: Gupta
authors.affiliation: Department of Biology, University of Western Ontario, London, Ontario, Canada, N6A 5B7.
authors.forename: Beth
authors.initials: B
authors.lastname: Szyszka-Mroz
authors.affiliation: Department of Biology, University of Western Ontario, London, Ontario, Canada, N6A 5B7.
authors.forename: Denis P
authors.initials: DP
authors.lastname: Maxwell
authors.affiliation: Department of Biology, University of Western Ontario, London, Ontario, Canada, N6A 5B7.
authors.forename: Marc-André
authors.initials: MA
authors.lastname: Lachance
authors.affiliation: Department of Biology, University of Western Ontario, London, Ontario, Canada, N6A 5B7.
authors.forename: Norman P A
authors.initials: NP
authors.lastname: Hüner
authors.affiliation: Department of Biology, University of Western Ontario, London, Ontario, Canada, N6A 5B7.
authors.forename: David Roy
authors.initials: DR
authors.lastname: Smith
mesh_terms: D001483:Base Sequence; D002467:Cell Nucleus / Q000235:genetics*; D002696:Chlamydomonas / Q000235:genetics*; D018742:DNA, Chloroplast / Q000235:genetics*; D004275:DNA, Ribosomal / Q000235:genetics; D016013:Likelihood Functions; D010802:Phylogeny; D018087:Plastids / Q000235:genetics*
chemical_list: D018742:DNA, Chloroplast; D004275:DNA, Ribosomal
keywords: Chlamydomonas; Lake Bonney; Psychrophile; cold adaptation; green algal phylogeny