Antonie van Leeuwenhoek

, Volume 77, Issue 4, pp 369–377 | Cite as

Taxonomic and phylogenetic analysis of Saprolegniaceae (Oomycetes) inferred from LSU rDNA and ITS sequence comparisons


The aim of this study was to improve our knowledge about the taxonomy and phylogeny of the family Saprolegniaceae, a group of water molds including several pathogens of plants, fish and crustacea. ITS and LSU rDNA were sequenced for representatives of forty species corresponding to ten genera (Achlya, Aphanomyces, Brevilegnia, Dictyuchus, Leptolegenia, Plectospira, Pythiopsis, Saprolegnia, Thraustotheca). Phenetic and cladistic analyses were then carried out. The species Brevilegnia bispora does not appear to belong to the family Saprolegniaceae. Plectospira myrianda clusters with Aphanomyces spp. and they constitute an ancestral group. (Thraustotheca clavata is closely related to the eccentric species of the genus Achlya. The genus Achlya appears polyphyletic, corroborating more or less the three known subgroups, defined by their sexual spore type (eccentric, centric and subcentric). The achlyoid type of spore dehiscence, shared by Aphanomyces and Achlya genera, is shown to be an ancestral character. The saprolegnioid, dictyoid and thraustothecoid types of spore dehiscence are derived characters but their relative evolutionary positions are not resolved.

Achlya ITS rDNA LSU phylogeny Saprolegnia Saprolegniaceae and taxonomy 


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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  1. 1.UMR CNRS/IRD 9926, Centre d'Etudes sur le Polymorphisme des Microorganismes, IRDMontpellierFrance
  2. 2.UMR INRA-AFSSA-ENVA Biologie Moléculaire et Immunologie Parasitaires et FongiquesEcole NationaleVétérinaire d'AlfortMaisons-Alfort CedexFrance

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