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18S rDNA AND EVOLUTION IN THE DASYCLADALES (CHLOROPHYTA): MODERN LIVING FOSSILS

Olsen, Jeanine L. ; Stam, Wytze T. ; Berger, Sigrid ; Menzel, Diedrik

Journal of phycology, 1994, Vol.30 (4), p.729-744 [Periódico revisado por pares]

Oxford, UK: Blackwell Science Inc

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  • Título:
    18S rDNA AND EVOLUTION IN THE DASYCLADALES (CHLOROPHYTA): MODERN LIVING FOSSILS
  • Autor: Olsen, Jeanine L. ; Stam, Wytze T. ; Berger, Sigrid ; Menzel, Diedrik
  • Assuntos: Acetabularia ; Batophora ; Biological and medical sciences ; Bornetella ; Chlorophyta ; Dasycladales ; Fundamental and applied biological sciences. Psychology ; Marine ; molecular clock ; molecular phylogeny ; Neomeris ; Plant cytology, morphology, systematics, chorology and evolution ; Plant evolution ; Polyphysa ; rDNA
  • É parte de: Journal of phycology, 1994, Vol.30 (4), p.729-744
  • Notas: ArticleID:JPY729
    ark:/67375/WNG-45W31Z6M-L
    Received 6 January 1994. Accepted 19 April 1994.
    istex:E35AE48711F964A65CF5DCEC0BEE3B7ED85105A1
    ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: Phylogenetic relationships were inferred from parsimony and distance analyses of nuclear small-subunit ribosomal DNA sequences taken from 14 species representing 8 of the 11 extant genera in the Dasycladales. Of 1733 aligned positions, 412 (23.8%) were variable and 251 (61%) of those were phylogenetically informative within the Dasycladales. Secondary structure was analyzed and taken into account during all phases of data analysis. Robustness of the trees was assessed using bootstrap analysis and g sub(1) statistics of tree-length decay. Strongly supported branches were robust to all methods of analysis regardless of weighting schemes used. The secondary structure of the 18S within the Dasycladales agrees with that of other green algae with the exception of a shared deletion in stemloop E10-1 (ca. 13 nucleotides long), which provides additional support for the uniqueness of this monophyletic group. A molecular clock was calibrated from the dasyclad fossil record and suggests a radiation of the Acetabulariaceae at 120 plus or minus 30 million years (Ma) ago and the Dasycladaceae 215 plus or minus 40 Ma ago. The split of the two lineages from a shared ancestor is estimated at 265 plus or minus 50 Ma ago. Within the Dasycladaceae, Neomeris and Cymopolia are sister taxa, as are Batophora and Chlorocladus. Bornetella groups with the Neomeris and Cymopolia clade in 78% of the bootstrap replicates. Relationships among the Acetabulariaceae show that Acetabularia and Polyphysa do not form monophyletic groups as presently circumscribed. No evidence indicates that Acicularia is the oldest genus. Halicoryne, Chalmasia, and Dasycladus were not included in the analysis. Molecular data provide a fresh background perspective from which to discuss the evolution of one of the most ancient lineages of green plants.
  • Editor: Oxford, UK: Blackwell Science Inc
  • Idioma: Inglês
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