Another Origin of Coloniality in Volvocaleans: The Phylogenetic Position of <i>Pyrobotrys</i> Arnoldi (Spondylomoraceae, Volvocales)
説明
<jats:p><jats:bold>ABSTRACT. </jats:bold> Colonial volvocaleans (Chlorophyceae) are used as a standard model of multicellular evolution. However, the phylogenetic position of the colonial volvocalean family Spondylomoraceae has yet to be resolved. To examine this, the molecular phylogenies of <jats:italic>Pyrobotrys stellata</jats:italic> and <jats:italic>Pyrobotrys squarrosa</jats:italic> were analyzed using combined 18S rRNA, RUBISCO large subunit, and P700 chl <jats:italic>a</jats:italic>‐apoprotein A2 gene sequences. In the phylogenetic trees, <jats:italic>Pyrobotrys</jats:italic> belonged to the clade <jats:italic>Caudivolvoxa</jats:italic> and was not closely related to other colonial volvocalean flagellates. The results indicate that colony formation of Spondylomoraceae independently evolved from unicellular volvocaleans. The phylogenetic position of problematic “<jats:italic>Pascherina tetras</jats:italic>” SAG 159‐1 was also analyzed.</jats:p>
収録刊行物
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- Journal of Eukaryotic Microbiology
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Journal of Eukaryotic Microbiology 57 (4), 379-382, 2010-07
Wiley
