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Diseases of Aquatic Organisms

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DAO 117:45-57 (2015)  -  DOI:

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

Kyle Fletcher1,2, Ante Žuljević3, Amerssa Tsirigoti4, Boris Antolić3, Christos Katsaros4, Vedran Nikolić3, Pieter van West2, Frithjof C. Küpper1,*

1Oceanlab, University of Aberdeen, Newburgh, AB41 6AA, UK
2Aberdeen Oomycete Laboratory, University of Aberdeen, Foresterhill, Aberdeen, AB25 2ZD, UK
3Laboratory for Benthos, Institute of Oceanography and Fisheries, Šet. I, Meštrovic΄a 63, HR-21000 Split, Croatia
4Department of Botany, Faculty of Biology, University of Athens, Panepistimiopolis, Athens 157 84, Greece
*Corresponding author:

ABSTRACT: A new geographic record of the oomycete Olpidiopsis feldmanni infecting the tetrasporophytic stage of the red alga 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 O. 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 3 other marine Olpidiopsis species established and genetically characterised in the last 2 decades. 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 species.

KEY WORDS: Central vacuole · Cyochrome oxidase subunit II · COII · cox2 · SSU rRNA · Falkenbergia · Transmission electron microscopy · TEM · Adriatic Sea

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Cite this article as: Fletcher K, Žuljevic΄ A, Tsirigoti A, Antolic΄ B and others (2015) New record and phylogenetic affinities of the oomycete Olpidiopsis feldmanni infecting Asparagopsis sp. (Rhodophyta). Dis Aquat Org 117:45-57.

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