Maullinia braseltonii sp. nov. (Rhizaria, Phytomyxea, Phagomyxida): A Cyst-forming Parasite of the Bull Kelp Durvillaea spp. (Stramenopila, Phaeophyceae, Fucales)

Pedro Murua, Franz Goecke , Renato Westermeier, Pieter Van West, Frithjof C Kuepper, Sigrid Neuhauser (Corresponding Author)

Research output: Contribution to journalArticle

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Abstract

Phytomyxea are obligate endoparasites of angiosperm plants and
Stramenopiles characterised by a complex life cycle. Here Maullinia
braseltonii sp. nov., an obligate parasite infecting the bull kelp
Durvillaea (Phaeophyceae, Fucales) from the South-Eastern Pacific
(Central Chile and Chiloe Island) and South-Western Atlantic (Falkland
Islands, UK) is described. M. braseltonii causes distinct hypertrophies
(galls) on the host thalli making it easily identifiable in the field.
Sequence comparisons based on the partial 18S and the partial 18S-5.8S-
28S regions confirmed its placement within the order Phagomyxida
(Phytomyxea, Rhizaria), as a sister species of the marine parasite
Maullinia ectocarpii, which is also a parasite of brown algae. The
development of resting spores in M. braseltonii is described by light and
electron microscopy and confirmed by FISH experiments, which visually
showed the differential expression of the 28S non-coding gene, strongly
in early plasmodia and weakly in late cysts. M. braseltonii is, so far,
the only phytomyxean parasite of brown algae for which the formation of
resting spores has been reported, and which is widely distributed in
Durvillaea stocks from the Southeastern Pacific and Southwestern
Atlantic.
Original languageEnglish
Pages (from-to)468-480
Number of pages13
JournalProtist
Volume168
Issue number4
Early online date13 Jul 2017
DOIs
Publication statusPublished - Aug 2017

Keywords

  • plasmodiophorids
  • brown algae
  • galls
  • rDNA
  • resting spores

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