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Saprolegnia parasitica zoospore activity and host survival indicates isolate variation in host preference

Matthews, Emily, Ellison, Amy and Cable, Joanne 2020. Saprolegnia parasitica zoospore activity and host survival indicates isolate variation in host preference. Fungal Biology 10.1016/j.funbio.2020.11.002
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The ubiquitous freshwater pathogen Saprolegnia parasitica has long been considered a true generalist, capable of infecting a wide range of fish species. It remains unclear, however, whether different isolates of this pathogen, obtained from distinct geographic locations and host species, display differences in host preference. To assess this, the current study examined the induced zoospore encystment responses of four S. parasitica isolates towards the skin of four fish species. While three of the isolates displayed ‘specialist’ responses, one appeared to be more of a ‘generalist’. In vivo challenge infections involving salmon and sea trout with the ‘generalist’ (salmon isolate EA001) and a ‘specialist’ (sea trout isolate EA016) pathogen, however, did not support the in vitro findings, with no apparent host preference reflected in infection outcomes. Survival of sea trout and salmon though was significantly different following a challenge infection with the sea trout (EA016) isolate. These results indicate that while S. parasitica isolates can be considered true generalists, they may target hosts to which they have been more frequently exposed (potential local adaptation). Understanding host preference of this pathogen could aid our understanding of infection epidemics and help with the development of fish management procedures.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Biosciences
Publisher: Elsevier
ISSN: 1878-6146
Date of First Compliant Deposit: 13 November 2020
Date of Acceptance: 12 November 2020
Last Modified: 20 Jan 2021 09:20

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