title: Phylogenetic position of some Chlorella species within the chlorococcales based upon complete small-subunit ribosomal RNA sequences.
abstract: Complete small-subunit rRNA (16S-like rRNA) coding region sequences were determined for eight species of the Chlorococcales (Chlorophyceae). The genera investigated include Prototheca, Ankistrodesmus, Scenedesmus, and five Chlorella species. Distance matrix methods were used to infer a phylogenetic tree that describes evolutionary relationships between several plant and green algal groups. The tree exhibits a bifurcation within the Chlorococcales consistent with the division into Oocystaceae and Scenedesmaceae, but three of the five Chlorella species are more similar to other algae than to Chlorella vulgaris. All of the sequences contain primary and secondary structural features that are characteristic of 16S-like rRNAs of chlorophytes and higher plants. Anikstrodesmus stipitatus, however, contains a 394-bp group I intervening sequence in its 16S-like rRNA coding region.
authors: Institut für Botanik und Pharmazeutische Biologie der Universität, Erlangen, Federal Republic of Germany.
authors: V A
authors: VA
authors: Huss
authors: M L
authors: ML
authors: Sogin
mesh_terms: D001483:Base Sequence; D002708:Chlorella / Q000235:genetics*; D000460:Chlorophyta / Q000235:genetics*; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D010802:Phylogeny; D012335:RNA, Ribosomal / Q000737:chemistry*; D012336:RNA, Ribosomal, 16S / Q000737:chemistry; D012689:Sequence Homology, Nucleic Acid
chemical_list: D012335:RNA, Ribosomal; D012336:RNA, Ribosomal, 16S