New record and phylogenetic affinities of the oomycete Olpidiopsis feldmanni infecting Asparagopsis sp. (Rhodophyta)

Kyle Fletcher, Ante Zuljevic, Amerssa Tsirigoti, Boris Antolic, Christos I. Katsaros, Vedran Nikolic, Pieter Van West, Frithjof Christian Kuepper

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A new geographic record of Olpidiopsis feldmanni infecting the tetrasporophytic stage of Asparagopsis sp. from the Adriatic Sea, confirmed through morphological identification, allowed us to expand previous observations of this organism. Ultrastructural investigations of environmental material showed a large central vacuole and a cell wall thicker than previously reported from other basal oomycete pathogens of algae. Phylogenetic analysis closely associates O. feldmanni to Olpidiopsis bostrychiae concurrent with structural observations. This constitutes the first genetic characterisation of an Olpidiopsis species that was initially described before 1960, adding to the genetic data of three other marine Olpidiopsis species established and genetically characterised since the millennium. The paper discusses concurrences of the ultrastructural observations made here and in previous studies of the marine Olpidiopsis species with those made on the freshwater studies.
Original languageEnglish
Pages (from-to)45-57
Number of pages13
JournalDiseases of Aquatic Organisms
Issue number1
Early online date17 Nov 2015
Publication statusPublished - 2015

Bibliographical note

Date of Acceptance: 14/09/2015
Acknowledgements. We are grateful to the Total Foundation (Paris) for its funding support to this study, to the UK Natural Environment Research Council (NERC) for a doctoral fellowship to K.F. and to the MASTS pooling initiative (Marine Alliance for Science and Technology for Scotland, funded by the Scottish Funding Council and contributing institutions; grant reference HR09011).


  • central vacuole
  • cyochrome oxidase subunit II
  • COII
  • SSU rRNA
  • Falkenbergia
  • transmission electron microscopy
  • TEM
  • Adriatic Sea


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