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Mol Biol Evol. 1995 Jul;12(4):671-8.

The phylogeny of the Hyphochytriomycota as deduced from ribosomal RNA sequences of Hyphochytrium catenoides.

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  • 1Departement Biochemie, Universiteit Antwerpen (UIA), Belgium.


Based on biochemical and ultrastructural data, hyphochytriomycetes are believed to share an ancestor with oomycetes and heterokont algae. In order to study the phylogeny of the hyphochytriomycetes, we determined both the small- and large-subunit ribosomal RNA sequence of Hyphochytrium catenoides. Phylogenetic trees were constructed using the neighbor-joining and maximum-parsimony method and include representatives of Chlorobionta, Fungi, Metazoa, Alveolata, and all known Heterokonta. Our main conclusion is that the hyphochytriomycetes form a monophyletic group with the oomycetes and heterokont algae and that they are probably the closest relatives of the oomycetes. However, the order of divergence between the various heterokont algal phyla and the oomycete-hyphochytriomycete cluster remains uncertain.

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